13 results about "Phenolphthalein" patented technology

The invention relates to the field of detection, in particular to a method for detecting phenolic stine compounds in food, which comprises the following steps: taking a sample in a centrifugal tube, and adding methanol for dissolving to obtain a sample solution; target ultrasonic parameters are determined according to the response surface model, and ultrasonic extraction is carried out according to the target ultrasonic parameters; centrifuging the sample solution subjected to ultrasonic extraction; centrifuging, taking supernate, and filtering to obtain a solution to be detected; preparing a standard series of working solutions; and detecting the sample solution and the standard series of working solutions by using a liquid chromatography-tandem mass spectrometer to obtain the content of the phenolic stine compounds in the sample. According to the application, the response surface model can determine the highest recovery rate of the sample after the sample is treated by the ultrasonic parameters, so that the sample is subjected to ultrasonic treatment according to the determined ultrasonic parameters, and the phenol-tin in the sample can be fully released into the solution; and thus, a more accurate detection result can be obtained when the solution is detected.

The invention belongs to the technical field of photo-thermal water evaporation films, and discloses a Janus-structure photo-thermal evaporation film for seawater desalination and a preparation method of the Janus-structure photo-thermal evaporation film. The Janus film is obtained by treating a composite film solution through a non-solvent induced phase separation method and a nano laser etching technology. The preparation method comprises the following steps: dissolving phthalazinone polyarylethersulfone ketone in N-methyl pyrrolidone, cooperating with nano molybdenum disulfide to prepare an upper layer of the photo-thermal super-hydrophobic water evaporation double-layer film, and dissolving quaternized phthalazinone polyarylethersulfone ketone in N-methyl pyrrolidone to prepare a hydrophilic lower layer of the water evaporation double-layer film. According to the prepared water evaporation thin film material, the super-hydrophobic upper surface and the hydrophilic lower layer are achieved through surface laser etching, meanwhile, the water evaporation thin film material has excellent photo-thermal performance in a full-spectrum area of sunlight, and the water evaporation rate is excellent under irradiation of 0.8 sunlight intensity and a 60-degree wide angle.

The invention relates to the technical field of enameled wire production, and in particular to a method for quickly judging the failure mechanism of a corona-resistant enameled wire. The judgment method comprises the following steps: S1, selecting a corona-resistant enameled wire to be judged; a detection solution consisting of salt, water and phenolphthalein; S2, placing the corona-resistant enameled wire to be judged in the detection solution and performing a leakage point test, wherein the leakage point test comprises the following steps: S21, energizing the corona-resistant enameled wire to be judged; S22, after energizing, observing reddened leakage points on the corona-resistant enameled wire to be judged; and S23, judging the failure mechanism of the corona-resistant enameled wire to be judged based on the reddened leakage points: if there are two reddened leakage points, the failure mechanism of the corona-resistant enameled wire to be judged is electrical breakdown failure; if there are three or more reddened leakage points, the failure mechanism of the corona-resistant enameled wire to be judged is corona breakdown failure; and if there are no reddened leakage points, the insulation performance of the corona-resistant enameled wire is qualified. The judgment method can quickly and accurately judge the failure mechanism of the corona-resistant enameled wire, and has the advantages of easy operation and low cost.

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 present invention provides a cleaning composition containing alkaline electrolyzed water, which facilitates the production of a diluted solution having a predetermined pH. [Solution] A cleaning composition is provided which contains bromothymol blue, thymol blue, or phenolphthalein as a pH indicator, and alkaline electrolyzed water having a pH of 12 or higher.

The invention relates to the technical field of environmental protection, in particular to a treatment process of tussah soda boiling wastewater, which comprises the following steps: step 1, burning rice husks, putting the rice husks into an adsorption column after burning, pumping soda boiling wastewater to soak the adsorption column, flowing out of the adsorption column, and enriching in a primary treatment storage tank to obtain a primary recycled water body; measuring the pH and the protein content of the primary recycled water body in the storage tank; step 2, adding phenolphthalein polyarylether sulfone immobilized protease into the primary recycled water body in the step 1 for enzymolysis adsorption, and filtering to obtain polyarylether sulfone particles adsorbed with sericin protein enzymolysis peptide and secondary filtered wastewater; and step 3, adding sodium carbonate or sodium hydroxide into the secondary filtered wastewater in the step 2 to adjust the pH value, pumping the wastewater back to the cocoon cooking pool for secondary tussah alkali cooking degumming, and recovering a solid mixture of rice hull ash and coarse sericin.

The invention relates to the technical field of water quality on-line monitoring, and discloses an urban reclaimed water lime softening treatment water quality on-line monitoring device and a use method, the monitoring device comprises a sampling unit, a pretreatment unit, a cleaning unit, a detection unit and a control center unit; one side of the sampling unit is connected with a water inlet sampling pipe and a water outlet sampling pipe of the clarification tank, and the other side of the sampling unit is connected with the pretreatment unit through a pipeline; the pretreatment unit is used for clarifying urban reclaimed water or circulating water, and the pretreatment unit is connected with the cleaning unit through a pipeline; the detection unit comprises a phenolphthalein alkalinity meter, a total alkalinity meter, a hardness meter, a conductivity meter and a pH meter, and the detection unit is connected with the pretreatment unit and a factory discharge pipe; the control central unit is electrically connected with the sampling unit, the pretreatment unit, the cleaning unit, the phenolphthalein alkalinity meter, the total alkalinity meter, the hardness meter, the conductivity meter and the pH meter respectively. According to the invention, a plurality of water quality indexes are automatically monitored on line, and the problems of particle pollution blockage and inaccurate detection in a water sample are solved at the same time.

The present invention discloses a hapten, an artificial antigen of phenolphthalein substances in weight loss foods and their applications. The hapten and artificial antigen of phenolphthalein substances are designed and obtained in the present invention, and an antibody capable of simultaneously recognizing phenolphthalein, bisacodyl and bispacol is prepared. The antibody has good recognition performance for phenolphthalein, bisacodyl and bispacol, and the lowest detection limits LOD for the three are 0.08 ng / mL, 0.44 ng / mL and 1.23 ng / mL respectively, and the half inhibitory concentration IC 50 are 0.40 ng / mL, 2.88 ng / mL and 12.11 ng / mL respectively, and there is no cross-reaction with functional analogues of phenolphthalein, bisacodyl and bispacol. Using the hapten, artificial antigen and antibody of phenolphthalein substances provided by the present invention can provide a technical basis for establishing a synchronous immunological detection method for phenolphthalein substances in weight loss foods, and has good application prospects.

The invention relates to the technical field of water quality detection, in particular to an ammonia nitrogen detection method. The non-toxic indophenol blue method is adopted, harm of mercury-containing test paper to the environment and operators is thoroughly avoided, waste treatment is simple, meanwhile, the reaction consistency of each piece of test paper is ensured by accurately controlling the liquid carrying rate, the reagent ratio and the uniform microfluidic structure, and the detection sensitivity is high. The built-in sodium potassium tartrate tetrahydrate and EDTA are used as masking agents, metal ions in a water sample can be effectively complexed, precipitation and side reaction are prevented, highly-credible quantitative data are provided for a user, accurate decision based on data is supported, complex water bodies such as underground water, seawater and industrial wastewater can be directly detected, the application scene is widened, and the application prospect is wide. And incompatible reagents are physically isolated, so that the spontaneous decomposition reaction in the storage period is fundamentally avoided, and the room-temperature shelf life is extremely long.

The present invention discloses an ultrasound-guided deep vein puncture and catheterization model, relating to the technical field of medical puncture models. The present invention comprises a human body model and a blood vessel model; the blood vessel model and the human body model are plugged together; the sides of the outlet ends of the arterial and venous simulated tubes are both provided with U-shaped grooves; the sides of the arterial and venous simulated tubes are both adhesively wrapped with adhesive tape at the locations of the U-shaped grooves; an alkaline container and an acidic container are respectively connected to the blood vessel model; and a plug-in sleeve is plugged together with a phenolphthalein test tube. The present invention provides U-shaped grooves on the sides of the arterial and venous simulated tubes, and adhesive tape is used to wrap the U-shaped grooves. The adhesive tape can be replaced to simulate the feeling of a missed puncture. After the puncture is completed, the puncture needle is pulled out of the simulated tube, and the test fluid in the simulated tube seeps out of the puncture hole and falls into the puncture cavity, and then drips into the phenolphthalein test tube. The phenolphthalein does not change color when exposed to acid, but turns red when exposed to alkali, and is used to determine whether the punctured simulated tube is arterial or venous.

The utility model relates to the technical field of concrete engineering detection instruments, in particular to a concrete carbonization depth tester which comprises a gun type shell, a cavity is arranged in the gun type shell, and a plurality of openings with different sizes are arranged at one end of the cavity. A cavity is formed in the gun type shell, a drilling device, a phenolphthalein liquid storage device and a depth detection device are arranged in the cavity and correspond to the openings, a leveling device is arranged at the front end of the gun type shell and comprises a wear-resisting cushion block, multiple adjusting support legs and a leveling plate, one ends of the multiple adjusting support legs are fixedly connected with the leveling plate, and the other ends of the multiple adjusting support legs are fixedly connected with the leveling plate. The other end is sleeved with a wear-resistant cushion block; a lifting air cylinder is arranged on the adjusting support leg, and the leveling plate is fixedly connected to the gun type shell. The concrete carbonization depth tester solves the problem of measurement deviation caused by uneven ground of an existing tester, the levelness of the tester can be quickly adjusted by arranging the leveling device, and the measurement accuracy is further improved.

The invention belongs to the technical field of chemical detection, and provides a method for detecting beta-cyclodextrin, which comprises the following steps: raising the temperature of beta-CD-containing feed liquid to be greater than or equal to 65 DEG C and less than 85 DEG C, inclusion phenolphthalein under a heat preservation condition, and then detecting the color development degree in an alkaline environment. According to the method, the detection range is greatly widened, tedious dilution is not needed, the operation is simplified, the efficiency is improved, and errors introduced in the dilution process are avoided; the method can be directly applied to detection of common high-concentration samples in industrial production.

The invention provides an online analysis method of primary loop boric acid, and belongs to the technical field of boric acid detection. The method comprises the following steps: firstly, diluting a water sample with demineralized water, dropwise adding a methyl red indicator, and carrying out acid solution titration; when acid solution titration reaches a first end point, mannitol and phenolphthalein indicators are added for alkaline solution titration, and when acid solution titration reaches a second end point, a C alkaline solution and a V alkaline solution are recorded; and finally, calculating the concentration of boric acid according to the sampling amount V0 of the water sample, the C alkali solution and the V alkali solution. The two indicators are respectively used in the two continuous titration processes, the indicator added for the first time can indicate the arrival of the first titration end point, and the indicator added for the second time does not interfere with the arrival of the second titration end point indicated by the indicator for the second time. According to the method, for judging the titration end point of methyl red, the design of double light source detection is adopted, and the titration end point of which the pH value is equal to 5.2 + / -0.2 is determined by calculating the absorbance value of the double light sources.