232 results about "Titration" patented technology

The invention belongs to the technical field of physical and chemical analysis, and particularly discloses a high-precision full-automatic titration system and method based on fusion of a spectrum sensor and a PLC, a multi-channel spectrum sensor is adopted to capture fine spectrum characteristics of solution color change in real time, and the flow rate of titration liquid is dynamically adjusted through a PLC embedded PID control algorithm, so that the titration accuracy is improved. The method realizes submilliliter-level precision control, constructs a real-time compensation mechanism in combination with temperature, humidity, pH and other environmental parameters, improves the accuracy and robustness of titration end point judgment, automatically updates an end point judgment threshold and control parameters in combination with an AI self-learning module, realizes self-adaptive adjustment and sustainable evolution of the system, and improves the accuracy and robustness of titration end point judgment. The device has the characteristics of modular structure, high detection precision, high control response and high operation stability.

The invention relates to the technical field of acidic wastewater titrimetric analysis, and discloses an automatic sampling titrimetric analysis method based on a copper smelting acidic wastewater treatment link, which comprises the following steps: collecting waste acid to obtain a waste acid sample; carrying out titration treatment on the waste acid sample to obtain a waste acid sample image after the titration reaction is finished, and carrying out sediment outline extraction on the waste acid sample image to generate sediment coagulation complexity; according to the method, automatic sampling titration is combined with image analysis, precipitation coagulation complexity and arsenic specific hue separation degree are extracted, a precipitation effectiveness index and an arsenic residue risk coefficient are generated through dynamic fusion, arsenic precipitates and other precipitates in similar forms are accurately distinguished by utilizing precipitate contour features and arsenic specific hue in an HSV color space, and the arsenic content is accurately determined. The method has the advantages that spectral signal superposition interference is avoided, and the arsenic residual state can be accurately reflected, so that whether arsenic removal is qualified or not is reliably judged, the accuracy and safety of waste acid treatment are improved, and the quality of water reuse is guaranteed.

The invention discloses a comprehensive circulating water analyzer based on a titrimetric analysis method, and belongs to the technical field of power plant water treatment. The analyzer is composed of a multi-channel titration module, an intelligent temperature control reaction kettle, an optical detection array and a central processing system, and through an integrated electrode-optical composite sensing technology, a dynamic temperature compensation algorithm and a deep learning end point prediction model, the problem that in traditional circulating water detection, the multi-parameter measurement precision is low (the error gt; 2%), the anti-interference capability is poor (the turbidity is gt; the innovation points comprise (1) a three-axis linkage microtitration mechanism (the precision is 0.1 microliter) and an anti-crystallization needle head design are combined to improve the reagent feeding stability by 50%, (2) a double-layer eddy current temperature control reaction system (the temperature control precision is + / -0.1 DEG C) and eliminate the interference of temperature fluctuation on the titration reaction, and (3) a transfer learning-based end point prediction algorithm (error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t). The device can synchronously detect eight indexes such as pH, Cl, SO, total hardness and the like, supports remote monitoring and automatic dosing of chemicals, is suitable for real-time monitoring of circulating cooling water of a power plant, the detection precision reaches + / -0.3%, and the single detection time is 1t, 2.5 minutes.

The invention discloses a water quality total hardness and calcium and magnesium ion content detection method, which comprises: extracting a water quality sample to be detected, and injecting into a cuvette; taking a color developing reagent, injecting the color developing reagent into the cuvette, blowing, stirring and uniformly mixing to obtain a reaction solution; measuring the initial current i0 of the reaction liquid in the cuvette at the wavelength of 475nm and the initial current I0 of the reaction liquid in the cuvette at the wavelength of 640nm; then titrating, and recording a measured current value and a titration volume while titrating; according to the obtained relation curve of the current and the titration volume under the two wavelengths, obtaining the titration volume corresponding to a titration judgment end point, and substituting the titration volume into the calibration curve to obtain the concentration of total hardness or the content of calcium and magnesium ions in the water sample. The measuring method disclosed by the invention not only has extremely high accuracy and precision, but also can be applied to measurement of total hardness or calcium ions under different indicators at the same time, and the turbidity of a water sample or magnesium hydroxide precipitate generated during calcium ion measurement hardly affects a test result.

The invention discloses a method for determining the content of hydrogen ions in a chloroplatinic acid solution, and belongs to the technical field of analytical testing. In order to solve the problems that the chloroplatinic acid solution is yellow after being diluted and the manual titration end point is difficult to judge, a potentiometric titration method is adopted, and the end point is determined by measuring electrode potential mutation without depending on indicator color change. The method comprises the steps of test condition preparation, burette calibration, standard solution preparation and calibration, sample treatment and titration, result calculation and the like, a full-automatic potentiometric titrator is selected, the titration volume is controlled within the range of 10-15 mL, and a sodium hydroxide standard solution is used for sample titration after calibration. The relative standard deviation of the determination result is less than 0.5%, the adding standard recovery rate is between 96.3% and 103.1%, and the method has the characteristics of high analysis speed, high accuracy and good stability, is suitable for accurate detection of hydrogen ions in chloroplatinic acid production and quality inspection, and effectively solves the defects of the traditional method.

The invention discloses a process and a system for monitoring chloride ions in circulating cooling water based on an on-line titration mode, and belongs to the field of water quality monitoring of industrial circulating cooling water. According to the process, an automatic sampling module, a titration reaction unit, a photoelectric detection module, a data processing module and a control unit cooperatively work. Circulating cooling water enters the titration reactor through automatic sampling, after an indicator is added, a titration agent is injected into the titration reactor through a peristaltic pump, a photoelectric detector judges a titration end point according to the change of the light transmittance of a solution, and the chloride ion concentration is calculated by combining a standard curve. According to the process, manual operation is replaced by online titration, 24-hour continuous monitoring is realized, turbidity interference is effectively avoided by applying photoelectric detection and a turbidity compensation algorithm, an intelligent cleaning mechanism is arranged, pipeline blockage is prevented, the service life of equipment is prolonged, and the automation level and the monitoring precision of monitoring chloride ions in circulating cooling water are greatly improved.

The invention discloses a prospecting exploration method for ion adsorption type heavy rare earth ore in middle and low mountainous areas, and belongs to the technical field of geological mineral exploration. According to Y, Dy and Nb abnormity and Y-Nb combination abnormity areas such as water chemical exploration and soil chemical exploration of a working area, high-silicon, potassium-rich, alkali-rich and sphene-rich heavy rare earth secondary mineral mineralization mother rocks are preferably selected, and a favorable mineralization area of the ion adsorption type heavy rare earth ore is delineated by combining characteristic parameters that Y / Ce is greater than 0.9 and Dy / Ce is greater than 0.2; screening south and east-south-east abrupt slope (gradient of about 30 degrees) areas by utilizing a GIS spatial analysis technology, overlapping favorable mineralization areas of the ion adsorption type heavy rare earth ore, and comparing and determining an ion adsorption type heavy rare earth ore prospecting target area in a working area; whether mineralization abnormity exists in the heavy rare earth ore prospecting target area or not is verified by using a manual impact sampling drill and a rare earth ion leaching-titration qualitative analysis method; chemical samples are preliminarily collected, 15 components of ion phases are analyzed, whether heavy rare earth ore bodies exist or not is judged and evaluated, the prospecting exploration range of the ion adsorption type heavy rare earth ore is determined, and the prospecting efficiency of the ion adsorption type heavy rare earth ore is improved. According to the method, the mineralization prospective area of the ion adsorption type heavy rare earth ore can be rapidly delineated in a large range, the prospecting target area is narrowed, and the prospecting efficiency of the ion adsorption type heavy rare earth ore is improved.

The invention relates to the field of chemical analysis automation equipment, and discloses an automatic potentiometric titration method which comprises the following steps: before a titration task is started, executing adaptive cleaning and collecting residual spectrum fingerprints of a system; calibrating a titration prediction model in real time by using the fingerprint; performing predictive titration to obtain complete titration data; after the titration is finished, carrying out multi-dimensional analysis on the whole process data, and quantitatively evaluating the pollution risk and the data quality; and finally, dynamically adjusting the cleaning strategy of the next task according to the evaluation result, and adaptively updating the prediction model according to the prediction deviation of the titration. By establishing a closed-loop intelligent working process of cleaning, diagnosis, feedback and learning, the state of the system can be sensed in real time, a cleaning strategy and a prediction model can be dynamically adjusted, the cleaning effect is ensured, self-optimization of the titration process is also realized, the long-term analysis accuracy and the intelligent level of the automatic titration system are improved, and the working efficiency is improved. And the dependence on manual intervention and troubleshooting is reduced.

The invention relates to a mercury content detection method, and relates to the technical field of mercury detection. According to the mercury content detection method, the to-be-detected sample is preliminarily quantified by using the X-ray spectrometer, the mercury content range of the to-be-detected sample can be quickly obtained, the to-be-detected sample is weighed according to the preliminarily measured mercury content, and the accuracy and reliability of subsequent detection can be guaranteed. By means of constant-temperature water bath heating, it can be guaranteed that a sample to be detected is completely decomposed, meanwhile, a solution in the cover type funnel is poured back into the conical flask, mercury compounds volatilized after heating can be collected, mercury content loss is avoided, and the stability and accuracy of subsequent detection results are further guaranteed. The mercury standard solution is prepared, the inductively coupled plasma emission spectrometer is used for detection, manual titration operation is not needed, the anti-interference capability is good, the mercury content can be accurately measured, and the stability and accuracy of a detection result are effectively guaranteed.

A computer implemented system for performing automated titration testing of water samples in order to calculate certain relevant metrics to ensure that the water at the water sites meets the desired standards. A computing device has an testing module that analyzes and produces reports containing data regarding the metrics for samples that have undergone testing using a separate titration device. The titration device includes an automated mobile carousel that holds multiple samples and a reaction chamber with a receptacle configured to receive fluid from the samples. The titration testing device automatically pumps the sample into a sample container held in place in the reaction chamber and pumps an appropriate amount of titrant depending on the metric being tested for so that different titrants are used depending on the metric and detects when the color change / endpoint occurs. Data is collected and reported to the computing device and titration testing module.

The application belongs to the technical field of analysis and detection, and discloses a method for continuously detecting pH value, sulfuric acid content and zinc ion content of electroplating liquid or conductive roller cleaning liquid. The method comprises the following steps: 1) selecting the "pH" block in "pH / mV" on the potential titrator, setting the instrument parameters, inserting the electrode into the to-be-detected liquid, and reading the pH value displayed by the potential titrator; 2) selecting the "mV" block in "pH / mV" on the potential titrator, selecting the dynamic pH titration mode, setting the instrument parameters, diluting the to-be-detected liquid after the pH value is detected, inserting the electrode into the diluted to-be-detected liquid, and adopting the sodium hydroxide standard solution titration, and ending the titration after two equivalent points appear; and 3) calculating the pH value, sulfuric acid content and zinc ion content of the to-be-detected liquid through a formula. The application can realize the continuous detection of the three indexes by adopting one instrument and one standard titration solution, is simple, fast and high in accuracy, and can effectively reduce the influence of chemical reagents on the health of workers.

The application provides an automatic titration analysis method for measuring the aluminum content in high aluminum alloy, which adopts direct reaction of fluoride with a test solution to realize one-step direct titration, and determines the aluminum content in the range of 2.00% to 100.00%, and comprises the following steps: sample decomposition; precipitation of interfering ions; calibration of sodium fluoride standard solution; calibration of automatic potentiometric titrator; and measurement of the sample to be tested. The application solves the problems of sample pretreatment and how to avoid the influence of interfering ions on the determination of aluminum content. The titration operation, reading and calculation are automatically completed by the instrument, effectively reducing human errors, and the application has the advantages of simple operation, accurate and rapid results, wide application range and the like.

The invention relates to a method for determining the chelation effect and the chelation rate of a compound amino acid microelement chelate. According to the determination method, the chelation effect and the chelation rate of the compound amino acid microelement chelate are determined through combination of an infrared spectroscopy method, an elemental analysis method and an anhydrous titration method, and the chelation effect comprises an action form and action intensity. The determination method comprises the following steps: weighing a compound amino acid trace metal chelate sample; taking a part of the to-be-detected powder and potassium bromide crystals, grinding together, pressing, measuring the infrared spectrum of the powder, and analyzing the chelation type and strength; taking another part of the to-be-detected powder, measuring the nitrogen content of the to-be-detected powder through an elemental analysis method, and calculating the total amount of amino acids in the sample; taking another part of the to-be-detected powder, removing inorganic salt in the to-be-detected powder, and drying; and dissolving the obtained solid powder, titrating without water, carrying out a blank experiment to eliminate the influence of reducing substances in the solution, and calculating to obtain the chelation rate. The method is simple and easy to operate and high in accuracy.

The invention discloses a method for testing the content of trivalent metal elements in a metal oxide, and belongs to the technical field of chemical analysis. The method comprises the following steps: firstly, reducing trivalent metal elements in a sample into divalent metal elements by using a reducing agent ammonium ferrous sulfate in a strong acid environment, wherein unreacted ammonium ferrous sulfate remains in a system; then, potassium permanganate is adopted for titration of unreacted ammonium ferrous sulfate, the end point is based on the fact that the solution becomes light pink and keeps color fastness for 15 seconds, and meanwhile a blank solution is set to eliminate system background interference; by comparing the difference between the blank titration volume and the sample titration volume and combining the titration concentration and the sample mass, the content of the trivalent metal elements in the sample can be accurately calculated. The method has the advantages of simplicity and convenience in operation, strong anti-interference capability, high detection precision and wide application range, is suitable for various metal oxide material systems, and is particularly suitable for quality control and performance analysis of new energy materials and catalysts.

This invention belongs to the field of analytical chemistry technology, specifically relating to a composite indicator and testing method for determining cadmium content in crude cadmium. The composite indicator comprises xylenol orange, thymol blue, and sodium indigo disulfonate, with a mass ratio of xylenol orange, thymol blue, and sodium indigo disulfonate of 1.0–1.5:0.3–0.6:0.5–1.0. This invention utilizes the ternary compound of xylenol orange, thymol blue, and sodium indigo disulfonate, employing the blue background of sodium indigo disulfonate and the reddish-purple and yellow hues of xylenol orange for optical color adjustment. This transforms the color change at the titration endpoint from the traditional reddish-purple to yellow to a bluedish-purple to yellowish-green, significantly increasing the color difference and creating a clear and sharp color change interface, greatly improving the accuracy and reliability of visual endpoint determination.

The invention relates to a method for detecting the peroxide value and the acid value of food, and belongs to the technical field of detection instruments. Putting a to-be-detected sample into the reagent bottle, and then dropwise adding a detection reagent into the reagent bottle; in the process, a light source is used for irradiating the reagent bottle, and a sensor is used for receiving light reflected by the reagent in the reagent bottle; the control system detects the light received by the sensor; when the color of the received light is a preset value, dropwise adding of the detection reagent is stopped; recording a titration end point, and determining a peroxide value; the acid value can be measured by the same method, and the color of the solution judged by the titration end point for measuring the peroxide value is different. According to the invention, light is utilized to irradiate a reagent and a sensor is utilized to carry out color detection, so that automatic detection of a peroxide value and an acid value can be realized, the detection precision can be improved, automatic detection can be carried out for a long time, and the detection efficiency is improved; meanwhile, workers are prevented from inhaling gas with pungent smell, and harm of chemical reagents to experimenters is reduced.

The application provides a kind of for inductively coupled plasma mass spectrometry alkaline liquid automation processing device and method, it is related to automation processing technical field.The inductively coupled plasma mass spectrometry alkaline liquid automation processing device of the described device is controlled and adjusted by intelligent control module to temperature control unit, acid-base adjusting unit and mixed uniform control unit in acid-base titration module, and the control and adjustment of liquid level detection unit in constant volume module by intelligent control module, realize the automation processing of alkaline liquid, can effectively improve the automation pretreatment efficiency and analysis efficiency of inductively coupled plasma mass spectrometry alkaline liquid, improve the accuracy and reliability of analysis result, can adapt to the rapid analysis demand of large-scale alkaline liquid sample.The alkaline liquid automation processing device of the application can be widely applied to the pretreatment of inductively coupled plasma mass spectrometry and inductively coupled plasma atomic emission spectrometry alkaline liquid.

The invention discloses an on-line automatic monitoring method and system for total alkalinity in water, and relates to the technical field of water quality on-line monitoring. When the current measuring state of the system is a starting state, a sampling unit is controlled to convey a target water sample to a mixed reaction unit based on a preset water sample flow; the reagent unit is controlled to convey a target reagent to the mixed reaction unit; dynamically adjusting the flow rate of the target reagent based on a proportional integral differential control strategy, so that the pH value of a mixed solution formed by mixing the target water sample and the target reagent in the mixed reaction unit fed back by the detection unit in real time is stabilized at a preset endpoint pH threshold value; and determining the total alkalinity of the target water sample based on the flow velocity of the target reagent when the pH value is stable, the concentration of the target reagent and the preset water sample flow. The pH value is stabilized at the titration end point by dynamically adjusting the reagent flow rate, the total alkalinity is calculated according to the reagent flow rate, the water sample flow rate and the reagent concentration during balance, continuous and rapid measurement can be realized, and the reagent consumption is low.

The invention provides a system for detecting and analyzing the content of sulfuric acid in sulfuric acid alkylation reaction effluent and a detection method. The analysis system comprises a sample collection and storage module, a sample pretreatment module, an acid-base titration detection module and a data processing module, and realizes efficient and accurate detection and dynamic feedback of the content of free sulfuric acid in effluent under complex working conditions; key support is provided for device operation state monitoring, technological process monitoring and product quality control, the detection efficiency is improved, the method is suitable for rapid detection and feedback in the operation process of an industrial device, the timeliness and safety of process control are enhanced, and the method has wide industrial applicability and popularization value.

The present invention provides a method for detecting the acid value in a low concentration in a photovoltaic adhesive film. The method includes the following steps: preparation of a sample to be tested; testing stage: first, the content and types of volatile acids of the sample to be tested are detected by headspace gas chromatography-mass spectrometry (HS-GC-MS), then the sample after headspace treatment is recovered and placed in a solvent, and swelling extraction is carried out by water bath ultrasonic treatment to obtain an extraction solution. After titration testing with an automatic potentiometric titrator in combination with an indicator, the acid value C is obtained; analysis of the test results. For the first time, it is proposed to combine headspace gas chromatography-mass spectrometry (HS-GC-MS) with full-automatic potentiometric titration to detect the acid value in the adhesive film. The combination of back titration and indicator method is used to improve the accuracy of detection, and for the first time, it is innovatively proposed to simulate the aging environment in a headspace vial to more accurately and comprehensively detect the acid value of the photovoltaic adhesive film.

The utility model discloses a titration device for quantitative drug analysis, which comprises a base, the top of the base is fixedly connected with a fixed support plate, one side of the fixed support plate is fixedly connected with a support table, the top of the support table is fixedly connected with a stepping motor, and the output end of the stepping motor is fixedly connected with a hollow plate. One side of the fixed supporting plate is fixedly connected with a funnel pipe, a titration groove rod is rotationally connected to the position, located in the funnel pipe, inside the fixed supporting plate, one end of the titration groove rod is fixedly connected with a disc, and a bolt is in threaded connection to the position, located in the hollow plate, inside the disc. The titration device is simple in structure, easy to operate, compact in structure and higher in practicability, and compared with a traditional device, the titration device is provided with the stepping motor, the hollow plate, the funnel pipe, the titration groove rod, the disc, the bolt and the threaded hole, so that different distances of the bolt mounted at the center of the disc can be adjusted according to use requirements.

The invention relates to the field of chemical analysis and detection, in particular to a method for rapidly detecting the concentration of industrial concentrated acid based on neutralization reaction, which comprises the following steps: 1, theoretical calculation; converting molar concentration according to acid density and mass fraction; 2, accurately measuring the volume of target acid by using a pipette; 2, injecting 100-150ml of pure water into the triangular flask, and adding 3-5 drops of phenolphthalein; 3, slowly injecting an acid sample into the triangular flask, and slightly shaking and uniformly mixing; 4, adding 10.00 ml of NaOH solution by using the pipette, and oscillating for 10-20 seconds; 3, result interpretation: transparency and colorless: acid is excessive when the acid concentration reaches the standard, pH is less than or equal to 8.2 after neutralization, pink lasts for 20-30 seconds, and reinspection is needed when the acid concentration is insufficient and the pH is greater than or equal to 8.3. The method has the beneficial effects that 1, a reverse judgment method is adopted, namely the conventional end-point titration is replaced by fixed alkali amount, so that the detection time is shortened to 2 minutes; 2, safety design: pre-dilution reduces the risk of acid mist, and only a trace amount of raw acid is needed to avoid acid corrosion; 3, multi-acid adaptation: compatibility with detection of different types of concentrated acids is realized through pipetting volume adjustment;

The invention provides a quick lime activity degree detection method based on the mass of hydration reaction residues. The quick lime activity degree detection method comprises the following steps: S1, weighing the initial mass of quick lime and recording the initial mass as m0; s2, putting a complexing agent into the quick lime in the S1, mixing, adding water, and uniformly stirring to obtain a mixed solution; s3, carrying out suction filtration on the mixed solution, and washing for multiple times to obtain unreacted residues; s4, the residues are dried and weighed, and the weight of the residues is recorded as mr; and S5, calculating the activity degree A (mL) of the quick lime according to the obtained m0 and mr in combination with a mass conservation principle. According to the detection method, a hydrochloric acid reagent does not need to be adopted for titration, only the quick lime, the complexing agent and the water need to be mixed for reaction, then suction filtration, drying and calculation are conducted, the whole detection process is high in safety, and secondary treatment does not need to be conducted on detection waste liquid. Meanwhile, an activity detection result is almost the same as a titration detection result, and the accuracy of the detection result is high.

The utility model discloses a full-sealed quantitative dripping device which comprises a quantitative pipettor which is hermetically mounted at the top of a box body of a box-type fluorescence detector in an inserting manner, and a sealed liquid storage device is arranged below the quantitative pipettor; the quantitative dripping device further comprises a titration mechanical arm assembly, a titration needle head is installed at the front end of the titration mechanical arm assembly, and the titration needle head, the quantitative pipettor and the closed liquid storage device are communicated through a burette line. According to the utility model, full-sealed and quantitative fluorescent drop illumination can be carried out in a box-type fluorescence detector, so that oil-gas possibility evaluation based on sample fluorescence is realized, and safe and rapid evaluation and auxiliary rapid decision-making of a well site are completed. The device is simple in overall design, compact in structure, convenient to mount and dismount, good in practicability and suitable for drop illumination of well site rock debris, wall core and rock core samples.

The invention provides a pretreatment method of an iodine-containing substance and a determination method of iodine content in the iodine-containing substance, and belongs to the technical field of chemical analysis. The iodine determination method comprises the following two steps: the first step is pretreatment for converting organic iodine into inorganic iodine, and the second step is determination of inorganic iodine. According to the pretreatment, iodine-containing substances are subjected to thermal combustion in a closed environment, iodine in a sample can be forcibly converted into iodine elementary substances, and the situation that the iodine conversion rate is low due to the fact that the sample is not flammable is avoided; the gas generated by combustion is introduced into the absorption liquid and is fully contacted and absorbed with the absorption liquid in a foaming manner, so that the recovery rate of iodine is increased; the iodate reacts with the reducing agent to generate iodide ions by utilizing the oxidability of the iodate under an acidic condition, so that the problem that the iodate is difficult to detect is avoided. The inorganic iodine is determined by an automatic potentiometric titration method, and standard solutions with different concentrations can be used for titration according to the iodine content, so that the detection requirements of different iodine contents are met.

The invention provides a titration constant volume device. The titration constant volume device comprises an operation platform, a feeding device, a first carrying device, a liquid adding device, a second carrying device and an analysis device. The operation platform is provided with a first area, a second area and a third area which are sequentially arranged. The feeding device comprises a cup body feeding assembly, the cup body feeding assembly is arranged on the first area, the cup body feeding assembly is used for storing cup bodies, and liquid samples are contained in the cup bodies. The first carrying device is arranged on the first area and is used for carrying the sample bottles and the cup bodies to the second area and the like. The analysis device is arranged on the third area and is used for analyzing and detecting the solution in the cup body. The steps of sample transfer, split charging, titration and constant volume and the like do not need manual intervention, so that the personal safety of operators and the environmental safety of a laboratory are remarkably improved.

This application provides a continuous titration method for the sulfuric acid and ammonium nitrate content of silicon etching solution. The continuous titration method includes the following steps: weigh m grams of silicon etching solution sample into a sample bottle, add phenolphthalein indicator, titrate with a first sodium hydroxide standard solution of concentration C1 until a pink color is achieved, and record the volume consumed V1. Calculate the sulfuric acid content. Add neutral formaldehyde solution to the same solution and let it stand for a first preset time to generate a free acid solution. Continue titrating the free acid solution with a second sodium hydroxide standard solution of concentration C2 until the solution turns pink. Gently heat the solution to a preset temperature and maintain this temperature for a second preset time. If the pink color persists, the titration endpoint is determined, and the volume consumed V2 is recorded. Calculate the ammonium nitrate content. This method achieves continuous titration of two components with a single sample, eliminates mutual interference between components, optimizes the endpoint determination method, and thus achieves a simple operation, high accuracy, low sample consumption, and high detection efficiency.

The invention discloses a chloride ion concentration automatic control method and system, and the method comprises the steps: extracting a sampling solution, and conveying the sampling solution to a stirrer; the stirrer detects the chloride ion concentration in the sampling solution through a titration method and outputs a digital signal representing the chloride ion concentration to the central processing unit; the central processing unit receives the digital signal, compares the chloride ion concentration with a preset value, generates a corresponding control signal and sends the control signal to the controller; the controller receives the control signal and drives the peripheral equipment to act so as to adjust the chloride ion concentration in the circulating system, and a chloride ion concentration change curve and the system state are displayed in real time through the displayer. A plurality of sampling points are arranged in a circulating system, the concentration of chloride ions in a sampling solution is analyzed by a stirrer, a digital signal is sent to a controller, and the controller processes the digital signal and controls peripheral equipment to act so as to adjust the content of the chloride ions in a solution in the circulating system. Therefore, the chlorine ion content in the circulating system is ensured to meet the preset process parameters.

The embodiment of the invention relates to a method for measuring the chloride ion concentration in water-based drilling fluid, which comprises the following steps: acquiring the voltage of a chloride ion sensor in various standard liquids with known concentrations at a preset constant temperature, and establishing a calibration corresponding relation between the voltage and the chloride ion concentration; diluting a to-be-detected water-based drilling fluid sample into a to-be-detected mixed solution according to a fixed proportion; and maintaining the to-be-measured mixed solution at the constant temperature, measuring the voltage of the to-be-measured mixed solution by using a chloride ion sensor, determining the concentration value of the to-be-measured mixed solution based on the calibration corresponding relation, and calculating the actual chloride ion concentration value of the water-based drilling fluid by combining the fixed proportion. According to the embodiment, a traditional chemical titration agent is abandoned, the potential safety hazard that an operator makes contact with toxic strong acid and carcinogenic potassium chromate is eliminated, the water-based drilling fluid to be detected is adjusted to the optimal linear range of a chloride ion sensor through quantitative dilution, and the detection efficiency and timeliness are greatly improved.