53results about How to "Long analysis time" patented technology

A system and method of analyzing a sample is described. The system includes an ion source and a deflector for producing a plurality of ion beams each of which is detected in distinct detection regions. A detection system uses the information obtained from the detection region to analyze the sample.

The invention relates to a high-efficiency high-flux method of connecting two-dimension array liquid chromatogram and mass spectrum. After separated by the first-dimension chromatogram, the analyzed sample enters the second dimension for further high-efficiency separation; the first dimension enters the second-dimension chromatogram from the flow interface through a single chromatographic column; the mobile phase of the second dimension is hit by a chromatogram pump and then is divided by a dividing device through the interface and then hit into the second-dimension chromatographic column. The second-dimension chromatographic column adopts the array mode, and each chromatographic column in the array is synchronously separated with the same chromatographic conditions, the outlet of each chromatographic column of the second dimension is connected with one channel of the multi-channel detector to conduct synchronous high-sensitivity detection. The invention has the advantages of large system peak capacity, high separating efficiency, sensitive detection, simple online classification, large commercial prospect and extensive analyzing object.

The invention discloses a seawater-resistant insoluble aqueous film-forming foam extinguishing agent and a preparation method thereof. The extinguishing agent comprises the following components in parts by weight: 300-400 parts of deionized water, 6-10 parts of sodium benzoate, 20-80 parts of urea, 5-9 parts of xanthan gum, 100-400 parts of Cocamidopropyl betaine, 20-60 parts of APG, 80-200 parts of ethylene glycol, 20-60 parts of ethylene glycol monobutyl ether, 10-50 parts of F1157, 10-50 parts of F1203, 10-60 parts of F1460 and 20-60 parts of a buffer agent. The seawater-resistant insoluble aqueous film-forming foam extinguishing agent is used for being mixed with seawater for fire extinguishing and has the advantages of low viscosity, high fire-extinguishing speed, high expansion rate, stable property, long storage time and the like.

The invention provides a foam extinguishing agent capable of automatically foaming. The foam extinguishing agent is prepared from a foaming agent, a film forming agent, a foam stabilizer, a pour point depressant, a thickening agent, a preservative and water. The foam extinguishing agent does not need to suck air and carbon dioxide is dissolved in the extinguishing agent; when the pressure is reduced, the carbon dioxide is released from the extinguishing agent so that foams are generated. The foaming multiple of the foam is related to the content of the dissolved carbon dioxide, and is not influenced by the flow speed and pressure of foam liquid; and the formed foam is fine and smooth, and uniform and stable, and the liquid dissolving time is long.

The invention discloses a compressed air foam fire extinguishing device for a large floating roof storage tank. The device consists of a foam solution generation mechanism, an air source and an air conveying dry pipe thereof, a foam release mechanism, a fire monitoring alarm and a box type compressed air foam generation mechanism. The device has multiple use modes, can be combined with such release devices as compressed air foam guns, cannons, nozzles or release pipes for use, is applied in such multiple modes as compressed air foam automatic spraying, compressed air foam fire hydrants and compressed air foam automatic seeking cannons, and effectively satisfies actual fire extinguishing demands of the large floating roof storage tank. The performance of the device is obviously superior to that of a traditional large outer floating roof storage tank low-power foam fire extinguishing system; and the defects of the low-power foam fire extinguishing system can be made up. The device not only can be applied to a newly built large floating roof storage tank, but also can be used for upgrading and reconstruction based on the tank wall type low-power foam fire extinguishing system of the traditional large floating roof storage tank.

Disclosed is a method for simultaneously preparing a pyromellitic acid and a terephthalic acid with coal serving as a raw material. The method includes firstly, adding potassium hydroxide, a coal sample and distilled water in a high pressure kettle to perform a reaction, cooling after the reaction to obtain an oxidation product, filtering and removing insoluble residues to obtain a filter liquor, acidizing the filter liquor by a concentrated sulfuric acid to enable a water soluble acid to be completely free, extracting a processed solution by butanone to obtain an extract liquor, subjecting the extract liquor to a vacuum evaporation to obtain a concentrate, recycling the butanone, subjecting the concentrate to a vacuum drying to obtain the water soluble acid, subjecting the water soluble acid to a selective decarboxylation in a mixed medium of an sulfuric acid, potassium acid sulfate and the distilled water to obtain the pyromellitic acid, adding coal acids and catalysts which remain after the preparation of the pyromellitic acid in a reacting kettle to perform a constant temperature isomerization reaction of the coal acids to obtain a filter liquor, cooling the filter liquor after the reaction, adjusting potential of hydrogen (pH) of the filter liquor by an diluted hydrochloric acid, precipitating the terephthalic acid in a sedimentation mode, filtering, washing and drying to obtain the refined terephthalic acid. By means of the method, the pyromellitic acid and the terephthalic acid can be simultaneously prepared, the reaction conditions are mild, conditions for devices are low, the terephthalic acid is a main product due to a high yield, and the pyromellitic acid is an auxiliary product.

The invention discloses a method for analyzing short-chain chlorinated paraffin in an environment sample by a comprehensive two-dimensional gas chromatography-flight time mass spectrometry, which belongs to the technical field of analytical testing. The method comprises the following steps: 1) performing enrichment extraction on SCCPs in the environment sample; 2) employing a comprehensive two-dimensional gas chromatography-electron bombardment ionization source-low resolution time-of-flight mass spectrometer for detection; 3) employing library searching and a retention time index for determining the nature of the SCCPs component in the sample; and 4) employing an internal standard curve method for determining total amount of SCCPs. The pre-treatment method has the advantages of high extraction efficiency, good purifying effect, and wide application scope; the used apparatus has the advantages of high analysis efficiency, good separating effect, and strong anti-interference capability;the qualitative method is fast and accurate, and does not depend on a standard substance; the quantification method has the advantages of low detecting limit, low sensitivity, wide linearity range, and good repeatability, and the analysis requirement of SCCPs in the practical environment sample can be satisfied.

The invention relates to a funnel fire extinguishing system and a fire extinguishing method.When a fire breaks out in a tunnel, a start button is pressed, or a compressed air foam gun automatically finds a fire area and is automatically started, or a worker remotely starts the compressed air foam gun, a system controller starts a compressed air foam generation device and switches on partition control valves, water flow is automatically adjusted, foam liquid and gas flow can be automatically adjusted according to water flow, compressed air foam is formed and a foam gun in a field worker handheld box is aligned to the fire area for fire exchanging, or the compressed air foam gun is automatically aligned to the fire area for jet fire extinguishing, or the worker remotely controls the compressed air foam gun to be aligned to the fire area for jet fire extinguishing.After fire extinguishing, a system restores the initial state under normal conditions.The problems that the fire extinguishing mode of an existing fire extinguishing technology in the tunnel is single, the fire extinguishing efficiency is low and safe evacuation of staff is not easy are solved.Fire extinguishing efficiency of the system is guaranteed.

The invention discloses a method for determining PPCPs (Pharmaceutical and Personal Care Products) in water by an LPME (Liquid-phase Micro Extraction) technology based on ionic liquid, wherein green solvent ion liquid takes the place of the traditional organic solvent, the PPCPs in environmental samples are extracted and separated by utilizing a single drop liquid phase micro extraction technology, and then the samples are detected by the high-performance liquid chromatography. The invention has the characteristics of small environmental pollution, good extraction effect, simple operation, low cost, easy combination with a chromatogram system and the like.

The invention belongs to the technical field of spent fuel reprocessing, and discloses an analysis method for a trace oxalic acid root in a mother liquor of plutonium oxalate precipitation. The analysis method comprises the following steps that: (1) the mother liquor of plutonium oxalate precipitation is diluted by 10 to 20 times, and a reducing agent is added to destroy potassium permanganate in the mother liquor of plutonium oxalate precipitation; (2) the test solution prepared in the step (1) is placed on an IC - H column to remove the positive ions in the solution; (3) the solution collected in the step (2) is placed into a container and heated under a temperature condition of less than 60 DEG C, and a gas is used to purge the upper surface of the solution to full dry at the same time; (4) a beaker is washed with deionized water for many times, the washing liquor is collected for fixing a volume, and the content of the oxalic acid root in the solution is measured by an ion chromatography. The analysis method has the characteristics of small interference of matrix, high accuracy and simple device adopted.

The invention relates to a method for determination of residual solvents in a ginkgo leaf extract bulk drug by headspace gas chromatography. The method includes the steps of: (1) chromatographic condition and system suitability test; (2) preparation of a reference solution and a test solution; and (3) determination: injecting the reference solution and the test solution respectively into a gas chromatograph by headspace sampling, and calculating the content of cyclohexane, ethanol and ethyl acetate by external standard method. Methodology validation indicates that the method provided by the invention has good separation degree, has detection limit, quantitation limit, linearity, stability, standard adding recovery rate and the like all meeting the requirements, and can be used for residualdetection of cyclohexane, ethanol and ethyl acetate in the ginkgo leaf extract. The analysis method for simple, fast and accurate detection of the ginkgo leaf extract solvent residue is suitable forindustrial production, and has great application value.

This invention provides a method and system capable of the continuous, real-time measurement of low concentrations of aqueous free cyanide (CN) using an on-line, flow through system. The system is based on the selective reactivity of cyanide anions and the characteristically nonreactive nature of metallic gold films, wherein this selective reactivity is exploited as an indirect measurement for aqueous cyanide. In the present invention the dissolution of gold, due to the solubilization reaction with the analyte cyanide anion, is monitored using a piezoelectric microbalance contained within a flow cell.

The invention, which belongs to the technical field of detection in food, particularly relates to preparation of an electrolytic solution and the use thereof for electrochemically detecting the content of sanshool quickly. The method comprises: providing an electrolytic solution containing a polar solvent and a supporting electrolyte; extracting a sanshool mother solution of a sample, carrying outdilution by using the electrolytic solution to obtain a to-be-tested solution, and adding an alpha-SOH standard solution to obtain a mixed solution; preparing an equal-concentration equal-volume to-be-tested solution again and adding two-times-volume alpha-SOH standard solution to obtain a mixed solution; repeating the process by multiple times and then detecting differential pulse voltammetry curves of sanshool substances in the mixed solution respectively by using a three-electrode system; and calculating the content of sanshool by combining a formula. The electrolytic solution has conductivity and no background interference exists during detection. The electrolytic solution has advantages of fast detection, high sensitivity, simpleness, high measurement accuracy, short time required for sample analysis, low cost, and great convenience in on-line detection and the like in the specific detection process.

The invention discloses a method for improving stability and sensitivity in content detection of formaldehyde in cosmetics. The method includes: adding a cosmetic sample into a cuvette with a plug, adding sodium sulfate solution and water, and obtaining a to-be-detected solution through water bath, cooling, centrifuging and filtering; measuring light absorbing degree of all of the to-be-detected solution in a by using a cuvette of 10 mm; drawing an absorbing spectrum figure of formaldehyde standard solutions different in concentration, and obtaining corresponding formaldehyde solution standard curves. When a single-wavelength method is adopted to calculate generated errors, RSD among parallel experiment results can reach 11.46%, but RSD of the method is only 0.485% at most. In addition, the method can effectively correct and eliminate influence of extraction liquid color and base line drift, and the detection limit is 0.75 mg/kg. Therefore the method has the advantages of short analysis time, convenience and quickness in operation, high sensitivity and accurate result and is suitable for detection of formaldehyde in the cosmetics.

The invention provides a porous biological assay substrate suitable for detecting at least one analyte in a biological sample fluid. The substrate comprises one or more capture probes able to each specifically bind one target analyte. The average concentration of the capture probes in pores with a size larger than the O50 of the substrate pore size distribution is at least equal to the average concentration of the capture probes in pores with a size smaller than the O50. The substrate thereby shows improved binding efficiency. The invention also relates to a method and device for producing the biological assay substrate, and to a method for examining analyte fluids using the substrate.

The present invention provides a data processor that not only makes it possible to analyze chromatograms in detail but can also collect analysis-associated information necessary for verification of data validity throughout the entire analysis process, even in cases where many samples are successively injected into a chromatography apparatus over a long period of time. The data processor comprises: a first data collecting section which, for each sample injection, collects and records a detector output at every data sampling pitch T1; and a second data collecting section which collects and records the detector output and a monitor output indicating an analysis-associated condition at every data sampling pitch T2 over a period from the start to the end of the chromatographic analysis, wherein the data sampling pitch T1 is shorter than the data sampling pitch T2. The second data collecting section further collects and records analysis history and/or optional comments; this is effective in verifying the validity of analysis results.

The invention discloses a universal high-stability foam extinguishing agent. The universal high-stability foam extinguishing agent is composed of a component A and a component B. The component A and the component B are dissolved in water and then rapidly mixed for a reaction, so thick compact high-stability extinguishing foam can be obtained through foaming. The high-stability foam extinguishing agent disclosed by the invention is good in fire control and extinguishing effects on A-type and B-type fire disasters, long in liquid segregation time and not easy to re-burn.

The invention relates to the technical field of analysis chemistry, and in particular relates to a detection method of residual solvents in a (N-(3-chloro-4-(3-fluorobenzyloxy)phenyl-6-(3-(4-methyl-4-oxo-1-nitrogen-4-phosphorus hetero yclohexane-1-yl)propyl-1-alkynyl)quinazoline-4-amine, bis 4-methyl benzenesulfonate bulk drug. According to the method, the (N-(3-chloro-4-(3-fluorobenzyloxy)phenyl-6-(3-(4-methyl-4-oxo-1-nitrogen-4-phosphorus hetero yclohexane-1-yl)propyl-1-alkynyl)quinazoline-4-amine, bis 4-methyl benzenesulfonate bulk drug is dissolved by DMSO, and then is injected in headspace, and the contents of four residual solvents, namely methyl alcohol, ethanol, isopropyl alcohol and N,N-dimethylformamide are detected by gas chromatography; and the column temperature of the gas chromatography is maintained for 5min at 35-50 DEG C, and then raised to 220+/-10 DEG C at the speed of 20 DEG C/min and maintained for 5-9min. According to the detection method, by verification, methyl alcohol has a detection limit of 0.3ppm and a quantification limit of 1.6ppm, ethanol has a detection limit of 0.5ppm and a quantification limit of 2.5ppm, isopropyl alcohol has a detection limit of 0.5ppm and a quantification limit of 2.6ppm, and DMG has a detection limit of 8.5ppm and a quantification limit of 19.1ppm. After the same sample is repeatedly detected for six times, the RSD is less than or equal to 2%, and the added sample recovery rate is 97.4%-103.1%, which indicates that the accuracy and precision are good.

The invention discloses a fireproof plugging system for a cable trench. The system comprises a compressed air foam generating device which comprises a compressed air tank, a foam liquid tank, a water tank and a mixer. An air inlet and a foam outlet are formed in the foam liquid tank. A foam liquid inlet and a mixed liquid outlet are formed in the water tank. A mixed liquid inlet, an air inlet and a liquid outlet are formed in the mixer. A tee joint is arranged at an outlet of the compressed air tank, the first end of the tee joint is connected to the air inlet, the foam outlet of the foam liquid tank is connected to the foam liquid inlet, and the mixed liquid outlet is connected to the mixed liquid inlet. The second end of the tee joint is connected to the air inlet. The system further comprises a main conveying pipe, the liquid outlet is communicated to the main conveying pipe, and a plurality of partition conveying pipes are connected to the main conveying pipe. Spray heads are arranged on the two sides of the firewall of the cable trench, and the partition conveying pipes are led to the spray heads. The system has the advantages of being high in plugging efficiency, small in size, large in foam output amount, easy to construct and maintain, safe to use and capable of facilitating mass application and popularization.

The invention discloses a method for converting ammonium dihydrogen phosphate and measuring the content of barium sulfate in barite, wherein the method comprises the steps: barium sulfate in barite and ammonium dihydrogen phosphate are combined with barium ions and hydrogen phosphate radicals at high temperature to form barium metaphosphate, and the sulfate radicals volatilize in the form of SO3; polybarium metaphosphate is converted into barium phosphate precipitate through acid and alkali soaking treatment, then the precipitate is dissolved to a constant volume, a proper amount of the solution is taken, a quemolybdenum citrone solution is added, phosphate ions in barium phosphate are converted into orthophosphoric acid through hydrochloric acid, and then the mass fraction of barium metaphosphate in the precipitate is calculated through co-precipitation formed by phosphoric acid and quemolybdenum citrone; and the content of barium sulfate in barite is calculated by utilizing the molar weight relationship. Although the method is long in analysis time, the influence of coexisting ions is eliminated, and the analysis result is accurate.