19 results about "Ph measurement" patented technology

The application relates to the technical field of electrochemical detection, and specifically discloses an ammonium sulfate PH calculation method based on an electrochemical principle and a temperature compensation technology, which comprises the following steps: collecting a non-standard state electrode potential signal and an NTC thermistor real-time resistance signal of an ammonium sulfate solution to be measured; using an improved temperature fitting algorithm based on a temperature-resistance nonlinear relationship and an optimized fitting process to convert an actual thermodynamic temperature of the solution; combining the actual thermodynamic temperature to compensate the non-standard state electrode potential signal, eliminating the interference of temperature change on the potential measurement; and substituting the compensated electrode potential value and the thermodynamic temperature into a simplified expression of the Nernst equation to inversely solve the hydrogen ion concentration, and then obtaining the final PH value of the ammonium sulfate solution through negative logarithm operation. The method optimizes the temperature fitting precision and the electrode potential compensation adaptability, and improves the PH measurement deviation problem of the ammonium sulfate solution.

Methods and systems are disclosed to assess clogging associated with a first well. The first well has a well screen or an open borehole in bedrock. A water sample is received from the first well during an ON state. Water is pumped from the first well during the ON state. A first oxidation reduction potential measurement and a first pH measurement are made on the water sample. First clogging specific information is determined for a first mineral or metal utilizing the first oxidation reduction potential measurement, the first pH measurement, and an Eh vs pH phase diagram for the first mineral or metal.

The present disclosure provides for an on-line system and method to determine a pH of low conductivity water. The system includes a first flow cell and a second flow cell to receive the water at a first flow rate and a second flow rate, respectively; a first pH probe positioned in the first flow cell to measure a first pH at a predetermined temperature and the first flow rate; a second pH probe positioned in the second flow cell to measure a second pH at the predetermined temperature and the second flow rate; a pH analyzer coupled to the first pH probe and the second pH probe, where the pH analyzer allows for a comparison of the first pH value and the second pH value; and an outlet for the water from the on-line system.

The invention is related to a PH balancing lid that enables users to measure PH levels during water consumption and has a mechanism for storing a PH measurement paper (A) to record the obtained values. Additionally, it includes a PH powder chamber (5.1) containing PH balancing powder within the lid body (2), allowing users to mix this powder with water by pressing a button (5) whenever desired, thereby balancing the PH.

An ISE measurement unit that measures the electrolyte concentration of a sample, a spectrophotometer that measures biochemical parameters of a sample, a pH measurement mechanism that measures the pH of a sample ,sample dispensing mechanisms that dispense the sample for measurement in the ISE measurement unit or the spectrophotometer from a container that contains the sample; and a conveyance mechanism that conveys the container. The conveyance mechanism, the sample dispensing mechanisms, and the pH measurement mechanism are disposed such that the dispensing of the sample by the pH measurement mechanism for pH measurement, or pH measurement, is performed after the dispensing of the sample by the sample dispensing mechanisms.

This self-addition sodium ion analyzer belongs to the technical field of trace sodium ion detection. The analyzer includes a sample alkalization cup, an alkalization system, a measuring flow cell, a sodium ion electrode, a pH triple-electrode, and an instrument display and control unit. The sample alkalization cup employs a variable flow path structure, utilizing the Venturi effect to raise the pH of the water sample to above 11 without the need for an external power source such as a pump. An additional sample buffer cell controls the sample flow rate, reduces electrode response time, and eliminates interference from small air bubbles. The sensor sequence is adjusted, with the sodium electrode preceding the pH electrode. A pH triple-electrode is added to measure the pH and temperature of the alkalized water sample and serves as a reference electrode for the sodium electrode. A sample evacuation function is also included to prevent cross-contamination between different samples. The analyzer features dynamic measurement capabilities, exhibiting excellent repeatability and high accuracy when measuring low sodium levels. It also possesses precise pH measurement capabilities, ensuring measurement reliability.

The invention relates to an oil substance pH detection method and system, an intelligent terminal and a storage medium, and relates to the technical field of oil substance pH detection.The method comprises the steps that pure water is collected and introduced into a pure water quantifying tank, and an oil sample is collected and introduced into an oil sample quantifying tank; controlling the pure water quantifying tank to output pure water with a preset volume into the stirring tank, and controlling the oil sample quantifying tank to output an oil sample with a preset volume into the stirring tank; the pure water and the oil sample are stirred through the stirring tank, so that the oil sample and the pure water form an oil-water mixture; introducing the oil-water mixture into a flow cell to measure the pH value of the oil-water mixture to obtain a pH measurement result; pure water is introduced into the stirring tank for cleaning, and after the cleaning time reaches the preset cleaning time, the stirring tank is emptied; introducing compressed air and pure water into the flow cell to carry out air-water mixed flushing operation; and repeatedly executing all the steps according to a preset period to obtain a pH measurement result set. The method has the effect of improving the pH detection efficiency of the oil sample.

A pH measurement system, comprising: a liquid intake pipe for a liquid to be measured, a flushing pipe, a pH measurement water tank (2) and a protective-liquid water tank (11), wherein the protective-liquid water tank (11) is configured to store a protective liquid; an output end of the liquid intake pipe for the liquid to be measured and an output end of the flushing pipe are connected to the pH measurement water tank (2); a flow measurement device is provided on the liquid intake pipe for the liquid to be measured; an output end of the protective-liquid water tank (11) is connected to the pH measurement water tank (2) by means of an output pipe of the protective-liquid water tank; a pH measurement device is provided inside the pH measurement water tank (2), a liquid level measurement device is provided on a side wall of the pH measurement water tank (2), and a liquid discharge pipe is provided at the bottom of the pH measurement water tank (2); and a first electric valve (13) is mounted on the output pipe of the protective-liquid water tank, and a second electric valve (10) is mounted on the liquid discharge pipe. The pH measurement system enables the protective-liquid water tank (11) to inject the protective liquid into the pH measurement water tank (2) in a deactivated state on the basis of feedback from the liquid level measurement device and the flow measurement device, thereby achieving offline protection of the pH measurement device.

The utility model provides a device for measuring the pH value of a high-temperature corrosive solution, and relates to the field of devices for measuring the pH value of the solution, the device comprises a solution storage tank and a telescopic measuring mechanism, the telescopic measuring mechanism is arranged on the upper side of the solution storage tank, and by arranging the telescopic measuring mechanism, the pH value of the high-temperature corrosive solution can be measured through the steps of measuring, washing and the like during use. According to the device, the actual pH value of the solution can be measured on line, the measurement accuracy is improved, the time of each step can be set, the actual measurement condition can be reflected, after one measurement cycle, the washing water pipeline can be used for washing the pH measurement electrode, the glass film of the pH electrode can be well protected until the measurement of the next cycle, and the measurement accuracy is improved. Therefore, the glass electrode of the pH meter is prevented from being soaked in a high-temperature corrosive solution for a long time, the accuracy of pH measurement is improved, the service life of the electrode is prolonged, the solution is thoroughly isolated from a human body in use, and the safety of operators is protected.

The present invention relates to a precursor manufacturing apparatus and a precursor manufacturing method. The precursor manufacturing apparatus according to the present invention is a precursor manufacturing apparatus that produces a precursor by causing a coprecipitation reaction of raw material substances, and includes a coprecipitation reaction tank that houses a container containing a reaction product and a filtrate, and a pH measurement system that measures the pH of the filtrate. The pH measurement system includes a filter that is located inside the coprecipitation reaction tank and filters the filtrate from the container, and a pH measurement unit that is located outside the coprecipitation reaction tank and measures the pH of the filtrate filtered by the filter.

Method for precise pH measurement of a liquid to be measured by means of a measuring device which has a pH measuring element (10) with at least one sensitive surface area (13, 16), comprising the following steps: (a) Calibrating the pH measuring element (10) using a calibration solution, (b) Carrying out at least one pH measurement on the liquid to be measured by means of the pH measuring element (10) to generate at least one valid pH measurement value, characterized in that between step (a) and step (b) a measurement preparation step (i) is carried out, in which at least the at least one sensitive surface area (13, 16) of the pH measuring element (10) is in contact with a measurement preparation liquid for a period of at least 30 seconds, preferably at least 5 minutes, more preferably at least 10 minutes, more preferably at least 30 minutes, the pH value of which deviates by at most 1 from the pH value, preferably by at most 0.5 from the liquid to be measured.

The embodiment of the invention discloses a seawater pH quality control sample and a preparation method thereof, and belongs to the technical field of analysis and detection. The method comprises the following steps: dissolving a buffer reagent in simulated seawater, and adjusting the pH value to a target value by using hydrochloric acid or sodium hydroxide to prepare a seawater pH quality control sample with the pH range of 2-10. The quality control sample with the pH range of 2-10 can be obtained, the wide range from strong acidity to weak alkalinity is covered, the pH measurement requirements of seawater samples in different sea areas and different depths are met, the pH quality control sample is good in stability, the validity period is as long as 2 years, the pH quality control sample can be widely applied to the fields of marine scientific research, environmental monitoring, water quality analysis and the like, and the application prospect is wide. And reliable technical support is provided for accurate measurement and quality control of the pH value of seawater.

Provided is an electrodialysis system capable of preventing generation of scale derived from hardness components and silica in treatment of a liquid to be treated having a pH of 3 or lower or 12 or higher, and capable of efficiently performing deionization treatment. This electrodialysis system comprises: an electrodialyzer having at least an anode, a cathode, a first bipolar membrane, an ion exchange membrane, and a second bipolar membrane, and in which the first bipolar membrane, the ion exchange membrane, and the second bipolar membrane are arranged in order from the anode side between the anode and the cathode; and a pH measurement means for measuring the pH of a treated liquid obtained after the liquid to be treated has passed through the electrodialyzer. When the value of the pH of the treated liquid measured by the pH measurement means reaches a predetermined value, the electrodialysis treatment by the electrodialyzer is terminated.

The embodiment of the invention discloses a dilution multiple method chromaticity standard substance as well as a preparation method and application thereof, and belongs to the technical field of analytical chemistry. The method comprises the following steps: weighing 0.105 g to 10.5 g of anhydrous sodium carbonate, and dissolving the anhydrous sodium carbonate in 1000mL of ultrapure water; adding a phenolphthalein indicator into the solution, and testing the pH value of the system; according to the equivalent relationship between the pH value of the system and the dilution ratio, the dilution ratio method chromaticity standard substance is valued. The standard substance provided by the invention has a determined chemical composition, the fixed value result of the standard substance can be traced to the pH measurement standard, the traceable fixed value can be realized by establishing the quantitative relation between the pH value and the dilution multiple, the accuracy of water quality chromaticity detection data and the reliability of the measurement result are remarkably improved, and the method is suitable for popularization and application. The technical defects of subjective judgment deviation, poor result reproducibility and the like existing in chromaticity detection of a traditional dilution multiple method are effectively overcome.

The invention relates to a method for precisely measuring the pH of a liquid to be measured using a measuring device which has a pH measuring element with at least one sensitive surface region. The method has the following steps: (a) calibrating the pH measuring element using a calibration solution, and (b) carrying out at least one pH measurement on the liquid to be measured using the pH measuring element in order to generate at least one valid pH measurement value. In order to increase the measurement precision, a measurement preparation step (i) is carried out between step (a) and step (b), wherein during the measurement preparation step, at least the at least one sensitive surface region of the pH measuring element is in contact with a measurement preparation liquid, the pH value of which deviates from that of the liquid to be measured by maximally 1 pH value, preferably by maximally 0.5 pH value, for a duration of at least 30 seconds, preferably at least 5 minutes, more preferably at least 10 minutes, more preferably at least 30 minutes.

Provided is a purification method for N-methyl-2-pyrrolidone that makes it possible to appropriately control an addition amount for an alkali compound and also makes it possible to separate and remove water and impurities. According to the present invention, a purification method for purifying a starting material that contains N-methyl-2-pyrrolidone and water and also contains a low-boiling-point amine and a methyl succinimide as impurities includes a pH measurement step for extracting a portion of an in-column liquid from at least one of a first distillation step and a second distillation step as a pH measurement liquid, mixing the pH measurement liquid and water such that the mass ratio of the pH measurement liquid and the water is 0.5–20, and measuring the pH of the mixed liquid, a calculation step for calculating an addition amount for an alkali compound on the basis of the pH results from the pH measurement step, and an alkali addition step for adding the alkali compound to the starting material from before the first distillation step or the like in the addition amount calculated at the calculation step. The amount of water is controlled such that the mass ratio of the pH measurement liquid and the water of the mixed liquid at the pH measurement step is a constant ratio within an error of ±5%.

A geothermal power generation system to control deposition of silica scale may include a steam separator that separates a geothermal fluid from a production well, into steam and hot water, such that the geothermal fluid passing through the steam separator and / or a turbine rotated by the steam is returned to a reinjection well. A pH measurement system measures a pH of the hot water. A first thermometer measures a temperature of the hot water. An injection device injects an alkaline chemical into the geothermal fluid. A second thermometer measures a temperature of the geothermal fluid at a pH estimation point selected from an injection portion for the alkaline chemical, an outlet of the steam separator, and an inlet of the reinjection well. A control device controls injection of the alkaline chemical based on measurement results of the pH measurement system, the first thermometer, and the second thermometer.

To provide an operational method of a reverse osmosis membrane device for improving water quality of treatment water of a reverse osmosis membrane device, especially, boron removal rate, in treating treated water with the reverse osmosis membrane device by adjusting pH.SOLUTION: A first reverse osmosis membrane device 1, a second reverse osmosis membrane device 2, and a water sending channel 3 are included. A water sending channel 4 of treatment water W2 and an exhaust channel 5 of concentrated water W3 are respectively connected to the second reverse osmosis membrane device 2. Also, a NaOH aqueous solution supply source 6 is connected to the water sending channel 3. Moreover, first pH measurement means 11 for measuring pH of treated water W1 is provided, and second pH measurement means 12 for measuring pH of the concentrated water W3 is provided. pH of the treated water W1 of the second reverse osmosis membrane device 2 is measured by the first pH measurement means 11, and pH of the concentrated water W3 of the second reverse osmosis membrane device 2 is measured by the second pH measurement means 12, and an addition amount of NaOH aqueous solution from the NaOH aqueous solution supply source 6 is controlled so as to have a relation of: pH of supply water W1≤pH of the concentrated water W3.SELECTED DRAWING: Figure 1

The automatic analyzer of the present invention comprises: an ISE measuring unit (32) for measuring the electrolyte concentration of a sample; a spectrophotometer (14) for measuring biochemical items of the sample; a pH measuring mechanism (34) for measuring the pH of the sample; a sample dispensing mechanism (21, 22) for dispensing a sample for measurement from a container containing the sample to the ISE measuring unit (32) or the spectrophotometer (14); and a transport mechanism (27) for transporting the container, wherein the transport mechanism (27), the sample dispensing mechanism (21, 22) and the pH measuring mechanism (34) are configured so that the sample for pH measurement by the pH measuring mechanism (34) is dispensed or the pH measurement is performed after the sample is dispensed by the sample dispensing mechanism (21, 22).