201results about "Chemical analysis using precipitation" patented technology

A full-history time-temperature indicator system which is capable of exhibiting a time-temperature dependent and visually detectable chemical reaction, useful for monitoring the time and temperature exposure of food products. The system comprises an immobilized reactant, such as Fe³⁺, and a mobile reactant, such as Fe(CN)₆^4-, initially contained in separate compartments, and separated by a sealing. The system is activated by removing a sealing between the compartments whereby the mobile reactant in a time-temperature dependent manner is brought into contact with the immobilized reactant resulting in a visually detectable reaction signal.

The invention relates to a method for measuring chloride ion content in high-performance concrete, comprising the steps: (1) free chloride ions and total chloride ions in the high-performance concrete can be extracted by a normal temperature soaking and oscillating method; (2) an improved Volhard chemical titration method is utilized to respectively measure the chloride ion content in the filtrate of the free chloride ions and the total chloride ions obtained in the step (1). The method has the advantages of simple operation, complete extraction, stable result and convenient operation, so as to meet the content measuring requirements of the solution with low concentration chloride ion, and be widely applied to the durability analysis and service life study of the high-performance concrete structure in the chloride environments such as oceans, deicing salt, etc.

The invention discloses preparation and quality detection method of compound prescription cortex phellodendri chinensis fluid. The quality detection method comprises the identification of forsythia fruit, cortex phellodendri, honeysuckle and dandehon herb, the checking of lonicerae flos, and the content determination of forsythin and berberine hydrochloride. According to the determination method, spots with the same colors are formed in a qualified test article thin-layer chromatogram and in corresponding positions of a reference substance thin-layer chromatogram, and negative control is interference-free, and the method is good in selectivity, simple and accurate. The checking method of lonicerae flos adopts a high performance liquid chromatography, is good in specificity, and can distinguish the situation that lonicerae flos is adopted in the compound prescription cortex phellodendri chinensis fluid to pretend honeysuckle flower to charge material. The content determination of forsythin and berberine hydrochloride is good in linear relation and high in recovery test accurancy, has good repeatability and stability, can accurately and strictly detect the quality of the compound prescription cortex phellodendri chinensis fluid, and guarantees a high quality standard level of the compound prescription cortex phellodendri chinensis fluid.

The invention provides a test method of the sulphate content in a flue gas desulfurization system, relating to the technical field of a test method of the sulphate content in a desulphurization system. The test method is characterized in that two samples to be tested are taken simultaneously, wherein one sample is used for determining the sulphite content, and the other sample is used for determining the total content of the sulphite and sulphate; and the sulphate content is calculated by the difference between the total content of the sulphite and sulphate and the sulphite content. The test method has the positive effects that the method is accurate, thus greatly improving the accuracy and the reliability of analysis results of the sulphate in the desulphurization system, and providing reliable analysis results for the operation of the desulphurization system. As the sulphite content in the desulphurization system is an indispensable project to be tested in the conventional analysis, thus not increasing the workload when determining the sulphate content. As the test can be completed only by using an analytical instrument in a conventional laboratory, and a determining project and a determining instrument do not need to be increased, the test method is a very practical analysis method.

The invention relates to a device for measuring the breakthrough sulphur capacity, which comprises a reactor, a gas supply source connected with one end of the reactor, a wet gas flow meter connected with the other end of the reactor, a valve arranged between the gas supply source and the reactor, and a hydrogen sulfide detector, wherein the hydrogen sulfide detector is arranged between the reactor and the wet gas flow meter and contains solution of silver nitrate. The invention also relates to a method for measuring the breakthrough sulphur capacity of a desulfurizing agent by using the device. The device is simple in design, the method for measuring the breakthrough sulphur capacity is simple, and the accuracy for measuring the breakthrough sulphur capacity is high.

The invention discloses a compound omeprazole capsule, and a preparation method and a detection method thereof. The capsule is prepared by: in parts by weight, 20 parts of omeprazole, 1100 parts of sodium bicarbonate, 30 parts of cross linked sodium carboxymethyl cellulose and proper amount of magnesium stearate; or the capsule is prepared by 40 parts of omeprazole, 1100 parts of sodium bicarbonate, 30 parts of cross linked sodium carboxymethyl cellulose and proper amount of magnesium stearate. Aiming at the deficiency of the prior art The formulation, the preparation technology and the detection method of the conventional compound omeprazole capsule are optimized, the compound omeprazole capsule of the invention exhibits more substantial curative effect for diseases comprising peptic ulcer, gastroesophageal reflux disease and the like caused by gastric hyperacidity; a systematic, integrated and effective component discrimination and content determination method is established, thereby the medicine quality is effectively controlled, and thus the clinic curative effect is guaranteed.

The invention provides a detection method of mercury content in burning coal, which adopts various of reagents and a common instrument to detect without expensive precise instruments or gold amalgamation to adsorb, so that the detection method is convenient to detect, has low cost, can detect mercury content in burning coal, and can detect the content of mercury of various forms by extracting step by step so as to solve the defect that trace element mercury in coal is difficult to detect. The detection of the mercury content in coal of various forms is favourable for judging the type of mercury pollutant in smoke and the migration rule and can guide to select the best desorption means to purify burning coal smoke. The method of the invention is especially suitable for detecting mercury content in power plant burning coal.

The invention provides a compound omeprazole capsule, a preparation method and a detection method thereof. The capsule is prepared from the following components in accordance with parts by weight: 200 parts of omeprazole, 1100 parts of sodium bicarbonate and a right amount of magnesium stearate and talcum powder or 40 parts of omeprazole, 1100 parts of sodium bicarbonate and a right amount of magnesium stearate and talcum powder. According to the compound omeprazole capsule, the preparation method and the detection method aiming at the defects of the prior art, the preparation process of the compound omeprazole capsule is optimized, so that the compound omeprazole capsule has obvious curative effects on treating diseases such as peptic ulcers, gastroesophageal reflux diseases and the like which are caused by hyperchlorhydria, and a systemic, integral and effective component identification and content determination method is established, so that the quality of the compound omeprazole capsule can be effectively controlled, thereby guaranteeing the clinic curative effects of the compound omeprazole capsule.

The invention discloses a method for determining the contents of asphaltine, colloid and wax, which is characterized by mainly comprising the following steps of: preparing activated macroporous silica gel; separating asphaltine from crude oil to obtain an oil sample, and calculating the content of the asphaltine; plugging absorbent cotton into an adsorption column and adding the prepared activated macroporous silica gel to the interior of the adsorption column, then injecting the oil sample into the adsorption column, separating colloid and petroleum ether out, and calculating the content of the colloid; and adding benzene-acetone to the obtained petroleum ether to obtain a wax solution, drying the wax solution to obtain wax, and calculating the content of the wax. The determination method provided by the invention is simpler, fast in determination speed and extremely accurate in the obtained content of the resultant asphaltine, the colloid and the wax, and accordingly, overcomes the defect the determination for the contents of the asphaltine, the colloid and the wax merely remains in theory at present, and thus, the method is quite practically significant.

The invention discloses a method for detecting the quality of bezoar snake bile bulbus fritilariae liquid which consists of the following raw medicament components in part by weight: 1.0 to 2.0 parts of artificial bezoar, 40 to 60 parts of unibract fritillary bulb, 6.0 to 10 parts of snake bile and 0.03 to 0.05 part of menthol. The method comprises the following steps of chemical identification of the unibract fritillary bulb, thin layer chromatography identification of the artificial bezoar, thin layer chromatography identification of the snake bile, and efficient liquid-phase method content determination of bile acid. The invention also discloses a preparation process and preferential raw material components of the bezoar snake bile bulbus fritilariae liquid. The method for detecting the quality can reflect the preparation quality of the bezoar snake bile bulbus fritilariae liquid from a plurality of aspects so as to ensure the curative effect and the medication safety.

A method for on-line monitoring an electrolytic capacitor condition comprising: measuring a voltage ripple across the electrolytic capacitor and the current ripple flowing through the electrolytic capacitor; measuring the temperature of the electrolytic capacitor; emulating the monitored electrolytic capacitor using a capacitor model comprising a capacitor and a solid state adjustable resistor, applying one of the measured ripple to the capacitor model, adjusting the solid state adjustable resistor to minimize the error between an estimated ripple provided by the capacitor model and the other measured ripple not applied to the capacitor model, and estimating an equivalent series resistance of the monitored electrolytic capacitor using value of the solid state adjustable resistor.

The invention provides a simulation and evaluation method and system for an under-salt dolomite water-rock reaction. The method comprises analyzing stratum water of a research area; stratum water classification is carried out by using a Sulin method; formulating experimental fluids, preparation of dolomite core sample, dolomite water rock reaction test is performed; the dolomite water-rock reaction is judged to reach chemical equilibrium; the method comprises the following steps: determining the fluid flow rate of the dolomite water rock reaction, carrying out the under-salt dolomite water rock reaction by using the prepared experimental fluid and a dolomite rock core sample, analyzing and calculating the changes of mineral components, corrosion and precipitation, and quantitatively evaluating the influence of the under-salt dolomite formation water on the corrosion and precipitation of the dolomite. According to the method, the quantitative evaluation of the reaction between the dolomite and the corresponding formation water under the geological background of the subsalt dolomite reservoir can be realized; the specific influence of stratum water attributes in the dolomite water-rock reaction process can be analyzed, control factors beneficial to formation and storage of under-salt dolomite pores are defined, and an analysis basis is provided for large-scale and efficient under-salt dolomite reservoir distribution and prediction.

The invention discloses a determination method for total sulfur in water quality. The method includes the following four steps: while sulfurous gas which can leak out is fixed by calcium oxide, potassium permanganate oxidation, nitric acid oxidation, hydrochloric acid regulation and barium chromate spectrophotometry are used for determining sulfate radical, which is converted into sulfur content. During total sulfur determination in water sample, calcium oxide and potassium permanganate are first added to oxidate sulfide ions under alkaline condition, sulfur in other valence states is then oxidated or decomposed into the sulfate radical under the joint oxidation of potassium permanganate and nitric acid, hydrochloric acid solution is then added to regulate the water sample and remove the color of the potassium permanganate, finally, the sulfate radical content in water quality is determined by barium chromate spectrophotometry, and total sulfur content is worked out. According to the characteristics of the sulfur in different valence states in water quality, by fixation, oxidation and decomposition, the method finally converts the sulfur in all valence states into the sulfate radical, and utilizes barium chromate spectrophotometry to determine the sulfate radical, and thereby the total sulfur in water quality is determined. Determination is simple, the result is accurate, and the method can be applied in fields such as environment protection and monitoring, food monitoring and sulfur balance analysis.

The invention relates to a detection method for qualitatively detecting whether thiazolidinedione medicines are doped in a Chinese patent medicine and a health food which have a hypoglycemic effect. The method comprises the following steps: 1, taking a sample to be measured, adding dichloromethane according to a case that 5-10mL of dichloromethane corresponds with 1g of the sample, strongly shaking for at least 40s, and filtering; 2, adding a small amount of a hydrochloric acid solution with the concentration of 0.08-0.12mol/L to a filtrate obtained in step 1, up-down overturning at least eight times, and standing for two-phase layering; and 3, adding a proper amount of a phosphomolybdic acid solution with the concentration of 0.04-0.1g/mL to an upper layer obtained in step 2 drop by drop. If deposition or turbidity appears, it shows that rosiglitazone or pioglitazone is doped in the sample. A corresponding kit comprises a reagent 1: dichloromethane; a reagent 2: the hydrochloric acid solution with the concentration of 0.08-0.12mol/L; and a reagent 3: the phosphomolybdic acid solution with the concentration of 0.04-0.1g/mL. The detection method of the invention has the advantages of accuracy and reliability, and the kit is convenient for carrying and carrying out onsite detection.

The present invention relates to a quick detection method of low-content mineral oil in edible oil. Said method includes the following steps: (1), using 0.1-2 ml of oil sample to be detected, adding isometric alkaline solution whose concentration is above 60% in a container, mixing them; (2), then adding ethyl alcohol whose concentration is above 95% and whose added quantity is 20-40 times said mixed solution; (3), placing said container in a hot water bath with 80 deg.C-100 deg.C, heating and shaking; and (4) adding boiling water and visually inspecting, if said solution produce cloudy phenomenon, it can judge that in the edible oil the mineral oil is contained.

The invention relates to a wild buckwheat rhizome polyphenol extract, a preparation method thereof, an identification method thereof and application thereof. The preparation method comprises the following steps: coarsely extracting wild buckwheat rhizome by adopting a low-temperature stirring dynamic percolation method; then refining the course extract by using neutral macroporous adsorption resin; and finally, drying the refined extract with microwave at the low temperature to obtain the wild buckwheat rhizome polyphenol extract with free organic substance residues, high activity and high purity. The wild buckwheat rhizome polyphenol extract can be widely used for treating various diseases, and particularly can be used together with other Chinese medicament to enhance the treatment effect. The technical characteristics of the wild buckwheat rhizome polyphenol extract are described by applying digitalized chromatographic fingerprint technology, the content and quality of the effective components of the wild buckwheat rhizome polyphenol extract can be quantitatively judged by measuring the fingerprints of a sample by adopting a liquid chromatography method.

The invention relates to a detection method of a traditional Chinese medicine composition with antibacterial and anti-inflammatory effects. The oral liquid preparation is prepared from 800g of herba houttuyniae and 200g of honeysuckle and has the characteristics of obvious curative effects, better improvement of the clinical symptoms, reasonable forms, fewer side effects and low price. The method comprises the steps of identifying the volatile components and herba houttuyniae, checking the relative density and pH value and measuring the contents of honeysuckle and herba houttuyniae.

The method of detecting corrosive sulfur content in crude oil or fraction oil includes making the crude oil or fraction oil react fully with metal powder at 200-400 deg c under stirring inside sealed container; and calculating the difference of sulfur content before reaction and that after reaction to determine the content of corrosive sulfur in crude oil or fraction oil. The metal powder is selected copper powder, carbon steel powder, iron powder or zinc powder. The method can determine corrosive sulfur content in crude oil or fraction oil effectively and has comparable data.

The invention relates to a method for detecting nickel, cobalt and manganese in a waste lithium battery, and belongs to the technical field of multi-element content determination. A sample is preparedinto a solution; cobalt reacts with nitrite in an acetic acid medium to precipitate so as to be separated from nickel and manganese, cobalt reacts with excessive EDTA, and copper sulfate is used to titrate residual EDTA to measure the content of cobalt; and ammonia water and hydrogen peroxide are added into a nickel and manganese solution obtained through separation to precipitate manganese so asto separate nickel from manganese, and the content of nickel and the content of manganese are measured respectively. The interference of elements such as nickel and manganese on cobalt determinationcan be reduced. The detection method is simple, the detection result is stable and accurate, and the standard addition recovery rate can reach 99% or above.

The invention discloses a method for analyzing composite type sodium polysulfide in aluminum alloy alkalization milling liquid. The method is characterized by comprising the steps of oxidizing an S-containing substance in the milling liquid into high-valence SO4<2-> through potassium perchlorate, depositing SO4<2-> ions through soluble barium salt, weighing generated BaSO4, and calculating the content of the composite type sodium polysulfide according to the weight of the substance of barium sulfate. According to the analysis method, an analysis error is smaller than 0.5 percent. The method mainly comprises the following steps of (1) sampling; (2) oxidization; (3) deposition; (4) filtering and drying; and (5) weighing. The invention discloses the simple method for analyzing the composite type sodium polysulfide in the aluminum alloy alkalization milling liquid; the analysis process is simple, and a result is accurate.

The invention discloses a heat dissipation and oil change device of an oil-immersed transformer. The device comprises a machine body; a working cavity is formed in the machine body; an oil changing cavity is formed below the working cavity; a connecting cavity is formed in the right side of the oil changing cavity; a power cavity is formed above the connecting cavity; a transmission cavity is formed above the working cavity; a heat removal groove is formed between the transmission cavity and the power cavity; when the device works, a transformer oil tank can be subjected to efficient heat dissipation through a heat dissipation assembly; a potassium permanganate tank can move downwards through an oil quality detection assembly to detect the oil quality in the transformer oil tank; an eccentric wheel can rotate and intermittently move downwards for performing cleaning through an oil tank cleaning assembly, so that deteriorated waste oil can be discharged and new oil can be added throughan oil discharging and changing assembly; and therefore, a heat dissipation effect is enhanced, the workload of workers is reduced, and the working efficiency is improved.

The invention discloses a preparation method and quality control method of sugar-free stranguria-treating and calculus-removing particles. Based on the original preparation process of stranguria-treating and calculus-removing particles, the inventor removes a large amount of sugar powder in the original process, and uses a proper amount of non-sugar adjuvant instead; the particles are prepared after materials are stirred to be soft, thus not only reducing the viscosity of the medicine, but also being beneficial to particle preparation; and the prepared particles are good in granularity, uniform in color and good in dissolvability. In addition, to alleviate the bitter taste, a proper amount of glycoprotein, steviosin, xylitol or sodium cyclamate which contains no heat and has no side effect is selected to be added as the corrigent, so the stranguria-treating and calculus-removing particles are comfortable in mouthfeel, convenient to take, and also applicable to patients suffering from diabetes, hypertension, hyperlipemia and obesity; and worry about side effects is unnecessary when the particles are taken. To ensure the medicine use safety and effectiveness of the stranguria-treating and calculus-removing particles product, the inventor maintains the original qualitative identification and adds quantitative measurement, and through measuring the quantity of total flavones in the particles, the medicine use safety and effectiveness are ensured, and the quality level of the relevant product of the stranguria-treating and calculus-removing particles are improved.

The invention provides an experimental device for a hydrate under a circulation loop is characterized by comprising an experimental pipe group, a mixing tank, a gas cylinder and a water container, wherein the water container is arranged above an electronic balance, connected with an injection pump through a pipe and then connected with the mixing tank; a safety valve and a first hand-operated valve are arranged on the pipe between the injection pump and the mixing tank; the gas cylinder is connected with the mixing tank through a pipe. The experimental device for the hydrate under the circulation loop has the following beneficial effects: 1, hydrate generation deposition experiments under the circulation loop can be performed; 2, hydrate deposition experiments with angles can be performed; 3, hydrate deposition experiments aiming at FBRM probes at corners and reducing positions in multi-phase flow can be performed.