164results about How to "Meet analysis requirements" patented technology

The invention discloses a general rapid detection method for micromolecular poisonous and harmful substances in liquid milk. The method is characterized in that the method concretely comprises the following steps: 1, carrying out simple and general extraction and purification on a liquid milk sample to obtain a loading liquid; 2, preparing a mixed standard solution and a matrix addition standard curve; 3, determining the micromolecular poisonous and harmful substances in the liquid milk through UPLC-MS/MS; and 4, carrying out concentration calculation. The method of the invention has the following advantages: the method starts from general characteristics of micromolecular compounds and fully takes the dissolvability, the thermal stability, the acidic and basic stability, the polar strength, the coexistent stability and the like of all the substances into consideration, a general rapid preprocessing technology and a UPLC-MS/MS electro-spray apparatus determination technology are developed, and the substantial efficiency improvement and the detection cost reduction effect are brought to the production process control and food detection work on condition that detection limit requirements are satisfied.

The invention discloses a method for simultaneously measuring multiple residues of organic chloride and pyrethroid pesticides. The method comprises the following working procedures: crushing a tobacco sample until grain diameters are less than 450 mu m; adding 10 to 20ml of extracting solution and internal standard solution into every program of tobacco sample; extracting the mixed solution by using ultrasonic wave; filtering the mixed solution by using a funnel filled with anhydrous sodium sulfate to obtain the extracting solution; adding the extracting solution into a Florisil solid extraction column for extracting and eluting; collecting an eluent; analyzing the eluent by using a gas chromatograph, wherein the analysis comprises the following conditions: adopting an Elite 5MS capillary column, high-purity N2 as a carrier gas, a constant flow mode in which the flow rate is 0.5 to 1.5 ml/min, a sample inlet temperature of between 280 and 320 DEG C, a detector temperature of between 330 and 370 DEG C, splitless sampling in which the sampling volume is between 1 and 2 mu L, and an initial temperature of 100 DEG C which rises from 100 to 180 DEG C at a speed of 8 DEG C/min, is kept for 4 minutes, rises from 180 to 270 DEG C at the speed of 5 DEG C/min and is kept for 15 minutes until all sample flows out completely; and determining the nature of the sample by using the retaining time of a standard sample and quantifying by using an internal standard method. In the method, ultrasonic wave is adopted for extracting and a solid extraction column is adopted for purifying, so that the method has the advantages of operating step simplification, high work efficiency, good purification effect, capability of simultaneously measuring multiple residues of 25 kinds of pesticides including 17 organic chloride pesticides of hexachlorocyclohexane, DDT and the like, seven pyrethroid pesticides such as fenpropathrin and the like, and one plant growth regulator.

The invention discloses a solid phase microextraction coating of a hydroxyl cucurbituril as well as a preparation method and an application thereof, relates to an analyzing sample pre-treatment technology, and belongs to the technical field of analytical chemistry. The solid phase microextraction coating is characterized in that a common pentabasic cucurbituril or six-membered cucurbituril is subjected to potassium peroxodisulfate oxidation and cation exchange resin separation and purification so as to obtain the hydroxyl cucurbituril through, the hydroxyl cucurbituril is bonded on a sol-gel mesh through a chemical reaction so as to obtain the solid phase microextraction coating, the coating is utilized to prepare a solid phase microextraction fibre which is combined with a gas chromatography, the environmental water sample containing polycyclic aromatic hydrocarbon is analysed, and the coating is utilized to prepare a solid phase microextraction stirring rod which is combined with a high performance liquid chromatography so as to analyze non-steroid antiinflammatory drugs. The solid phase microextraction coating provided by the invention has the advantages that the superficial area of the coating is large, and the extraction capacity is large; and the solid phase microextraction coating is a novel solid phase microextraction coating, is used for analyzing, high in selectivity, low in detection limitation, wide in linearity range, and good in selectivity.

The invention discloses a 3104 aluminum alloy spectrum standard sample, which is characterized in that the aluminum comprises Si 0.04-0.70%, Fe 0.18-0.90%, Cu 0.02-0.34%, Mn 0.65-1.3%, Mg 0.65-1.58%, Zn 0.04- 0.34%, Ti 0.04-0.91%, Ni 0.05-0.11%, Cd 2-70ppm, Pb 8- 170ppm, Ga 0.008-0.11%, V 0.008-0.11% and Na 1-40ppm. The invention also discloses a preparation method thereof. The inventive aluminum alloy spectrum standard sample can be used for the control and the analysis of 3104 aluminum alloy.

The invention belongs to the field of radiation monitoring technology and provides a typical nuclide monitor of fuel element failure. The monitor is realized based on a typical nuclide detection method of fuel element failure and comprises a detection sampling unit and a signal processing unit. The detection sampling unit is composed of a spiral sampling line, a lead shielding body and a detector core body. The signal processing unit comprises a main amplifier, a sampling unit and a host unit. The monitor provided by the invention can carry out quantitative monitoring on typical fission nuclide in a loop coolant by a gamma spectrometry technology, so as to accurately and timely judge whether a fuel element is damaged. The typical nuclide monitor has characteristics of high precision, fast response and good real-time performance, and is simple and easy to use.

The invention discloses an equipment data layered acquisition method. The method comprises the following steps: dividing equipment data into at least first layer data, second layer data and third layer data; collecting one group of first layer data every a first time interval and obtaining a group of first indexes of the group of first layer data; selecting one of the plurality of groups of first indexes obtained in a preset time interval every the preset time interval and storing the group of first indexes; collecting one group of second layer data every a second time interval, and obtaining one group of second indexes of the group of second layer data; storing each group of second indexes; collecting one group of third layer data every a third time interval, and obtaining one group of third indexes of the group of third layer data; and storing each group of third layer data and the group of third indexes of the group of third layer data. The invention also provides an equipment data layered acquisition device.

The invention relates to a gas chromatographic detection system and method for analyzing hydrogen isotopes and trace impurity components in He. The system comprises a six-way valve I (1), a ten-way valve (2), a six-way valve II (3), a four-way valve (4), an eight-way valve (5), a helium discharge ionization detector (6), a thermal conductivity detector (7), a quantitative pipe I (8), a quantitative pipe I (9), a first chromatographic separation column (10-1), a second chromatographic separation column (10-2), a chromatographic separation column (10-3) and He carrier first, second, third, fourth and fifth branches (101, 102, 103, 104 and 105). A multi-dimensional gas chromatographic detection system is integrated with a gas chromatographic path system, so that trace and percentage hydrogen isotopes and trace impurity gas components in gas of a tritium extraction process can be quickly and precisely measured on line; therefore, multiple high-standard analysis requirements can be met, and the gas chromatographic detection system is convenient to operate.

The invention provides a method of detecting the trace polychlorinated biphenyls in atmospheric particulates by ion trap tandem mass spectrometry; the steps of the method comprises sample collection, sample leach, sample concentration and purification and the detection of pilot sample by chromatography-ion trap mass spectrometry; by optimizing the conditional parameters of gas phase chromatography and tandem mass spectrometry, the invention has better selectivity and better sensitivity in the detection of titled compound compared with the conventional detection method; the invention solves the mutual interference between PCBs and multi-chlorine organic compounds in the traditional analysis and detection method by SRM technique of gas phase chromatography/ion trap tandem mass spectrometry (GC/ITMS), and greatly simplifies the fussy steps of purification and separation in sample pretreatment; SRM technique has the advantages of sensitivity, selectivity, low detecting expense and reliable and accurate determination of the nature; therefore, the invention has remarkable advantage compared with the traditional detecting instrument such as GC/ECD,GC/LRMS,GC/HRMS.

The invention discloses a bore-tunneling electrical ahead monitoring device based on an optical fiber current sensor, and a detection method thereof. The bore-tunneling electrical ahead monitoring device is composed of a constant current source, a voltmeter, a laser light source, the optical fiber current sensor and an anchor rod. A tunneling part of a tunnel boring machine (TBM) is supplied with a constant current I, a circle of an optical fiber winds around the rear part of a cutterhead and the rear part of a shield, the magnitude of current on each of the cutterhead, the shield and TBM rear guaranteeing equipment can be obtained by using the optical fiber current sensor, and voltage on the shield is measured for calculating apparent resistance of a geologic body, so as to judge water content and rock class of the geologic body. Compared with the traditional bore-tunneling electrical ahead monitoring method, the bore-tunneling electrical ahead monitoring device based on the optical fiber current sensor omits a great deal of pre-insulating operation.

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 an experiment device for pretreatment on samples, and in particular to a functional pipetting head with double purification functions of ultra-filtration and solid extraction, and application of the functional pipetting head in pretreatment and quantitative analysis on a biological sample in the medicine analysis process. The functional pipetting head comprises a pipetting head body, a solid-phase extraction material and a hollow fiber membrane, wherein the hollow fiber membrane is arranged at the sharp end of the pipetting head body; an adhesive is uniformly applied at the cross part of the sharp end of the pipetting head and the hollow fiber membrane; an upper end opening and a lower end opening are formed in the hollow fiber membrane; the upper end opening is sealed; the lower end opening is kept in an opened state; the solid-phase extraction material is arranged inside the pipetting head body. The functional pipetting head is simple, convenient and controllable in manufacturing process, flexible in extraction condition adjustment, scientific and reasonable in method, convenient in obtaining materials, and good in application prospect.

The invention discloses a PCR primer combination for adverse reaction genotype polymorphism of statin drugs and an application and belongs to the technical field of biomedical molecular detection. ThePCR primer combination comprises primer pairs 1-4 for amplifying SNP sites rs4149056, rs2306283, rs429358 and rs7412, with the sequences shown in SEQ ID No.1-2, 5-6, 11-12 and 13-14; the PRC primer combination also comprises a single base extension primer combination for specifically amplifying the SNP sites, with the sequence shown in SEQ ID No.17. By means of the primer combination and the detection method, the technical problem that multiple target amplification conditions are not compatible is solved, the effect that multiple primers are added to one reaction hole and not interfere one another is realized, and the lowest detection limit can reach 0.01 ng/mu L when four mutant site genotypes on different genes about safety and curative effects of statin drugs are detected.

The invention discloses a power supply service search engine based on hot words. The power supply service search engine comprises a business work order database, a hot word association database, an indexer, an index database, a searcher, a user interface, a user behavior log database and a log analyzer. Through a Baidu type search engine, based on a search platform, a work order search display andstatistics mechanism is built, the association relationship of the hot words and a worker order is studied, a client service work order is traced, work order tracking is conducted on hotspot vocabularies, analysis requirements for power supply businesses are met, searching is faster and more effective, problems can be quickly positioned, and the power supply service search engine has high practical value.

The invention provides a magnetic layered double hydroxide-metal organic framework composite material as well as a preparation method and application thereof, belonging to the technical field of composite materials. The structure of the magnetic layered double hydroxide-metal organic framework composite material is Fe3O4@ZnAl-LDH/ZIF-8. The preparation method comprises the following steps: preparing Fe3O4@ZnAl-LDH by adopting a coprecipitation method, and generating ZIF in situ on the surface of Fe3O4@ZnAlLDH by adopting a solvothermal method to prepare the Fe3O4@ZnAl-LDH/ZIF-8 composite material. The magnetic layered double hydroxide metal-organic framework composite material is applied to the field of micro-extraction, so rapid magnetic separation can be achieved, the magnetic layered double hydroxide metal-organic framework composite material can be recycled, extraction time is shortened, and experiment cost is reduced. Meanwhile, through hybrid ZIF-8, the specific surface area of ZnAl-LDH is increased, and the extraction efficiency of ZnAl-LDH on a target compound is greatly improved. The composite material can sensitively, simply, conveniently and quickly detect target components, can meet analysis requirements on EDCs in milk samples, and also shows good application potential in the aspect of trace organic pollutant analysis and determination.

The invention relates to a preparation method of Cr-Mo steel EBSD samples, which particularly includes the following steps: (a) grinding one surface of a Cr-Mo steel EBSD sample by abrasive paper and grinding a to-be-test surface through silicon carbide waterproof abrasive papers being 280#, 400#, 800#, 1000# and 1500# in meshes; (b) polishing the to-be-test surface with diamond polishing fluids and aluminum oxide polishing fluids in different granularities; (c) reducing the thickness of the mechanically-polished sample to 3 mm through a wire cutting machine; (d) cleaning the sample to remove oil dirt from the sample; (e) continuously polishing the to-be-test surface of the sample with a polishing fluid being 50 nm in granularity for 1-4 min; and (f) cleaning the polished sample in anhydrous ethanol and air-drying the sample to obtain the sample for EBSD analysis. The preparation method is simple, wherein the sample just needs to mechanically polish without any special electrolytic polishing device, so that the method is low in sample making cost and the sample satisfies the requirement in the EBSD analysis.

The invention belongs to the field of analysis of element content and relates to a method for contents of lanthanum, cerium and yttrium elements in a multi-component nodulizing agent by applying an ICP-AES method, which has the characteristics of accuracy, rapidness, convenient operation and the like, and is suitable for production and detection. The technical scheme provided by the invention has the beneficial effects that according to the method for the contents of lanthanum, cerium and yttrium elements in a multi-component nodulizing agent by applying the ICP-AES method, few technical flows are needed, the detection period is greatly shortened, and meanwhile, the detection blank is filled; the microelements in the nodulizing agent are measured by applying the ICP-AES method, the detection range is enlarged, and a new detection method is explored, thus providing analysis basis is provided for the problems such as product defects; the content ranges of the lanthanum, cerium and yttrium elements are measured to be 0.0001%-4.00% by applying the method, the analysis result is accurate, and the recovery rate is 97.2%-99.7%; due to the application of the ICP-AES method, the analysis result is accurate, the analysis requirements on the contents of lanthanum, cerium and yttrium can be met, and the casting quality can be guaranteed.

The invention relates to a chemical substance detection method, and especially relates to a method for detecting phthalate substances in an environmental sample. The method comprises the following steps: extraction of PAEs from the environmental sample, a fluorescence reaction, sample determination, and drawing of a standard working curve. The standard working curve is obtained through the following steps: detecting the fluorescence intensity of a DnBP standard solution reaction system by a fluorospectrophotometer three times, averaging the obtained resuls, and linearly fitting the obtained average value and the corresponding DnBP concentration. The phthalate fluorescence analysis method has the advantages of simplicity in operation, fast analysis speed, and good precision, the detection limit is 8.2 * 10<-3> mg.L<-1>, the RSD of parallel samples is 5.6%, the recovery rate of DnBP in a soil sample is 95-120%, the recovery rate of the DnBP in a water sample is 90-115%, and the method can be used for detecting the total amount of the PAEs in the environmental sample, and has certain practical application values.

The invention discloses a preparation method of a nickel steel-containing sample for an EBSD analysis. The method comprises the following steps: rough machining of the nickel steel-containing sample, fine polishing after polishing and erosion, surface cleaning after fine polishing of the sample, and the sample for the EBSD analysis is obtained; the fine polishing process comprises the following steps: diamond suspension liquid is used for polishing the sample after polishing and erosion, and aluminum oxide suspension liquid is used for polishing the sample. Special sample preparation links are reduced for facilitating implementation; the fine polishing process can relieve stress; compared with the conventional polishing method, the method has the advantages of simplicity, saved time, reduced sample preparation cost, and improved sample preparation efficiency, and the sample has a high desorption rate which can meet the requirements of EBSD analysis. The method has high operability, so that sample preparation is simple and timesaving, and preparation efficiency of the sample is improved. The sample for the EBSD analysis has a high desorption rate and good stability, the calibrate rate of the sample reaches 90% or above, general demands are satisfied, and the effects are good.

The invention relates to a method for quickly measuring methanal content in dried beancurd sticks, which is characterized by adopting a combined using method of an efficient liquid phase chromatogram method and a viable wavelength detector (VWD) to qualitatively and quantitatively measure methanal content in dried beancurd stick products. The method comprises the steps of using Nash reagent to perform precolumn derivation and chromatographic analysis on derivation products, enabling the detection wavelength of the VWD to be 412nm, and performing gradient elution with a binary system of acetonitrile and water as flow phase. The flow speed is 0.8mL/min to 1mL/min, the judgment standard of the methanal content is that a linear range of the methanal content is 0.00 to 0.80mg/L, the linear equation is that Y is equal to 27.024X, the Y is the peak area of derivation reaction products, and the X is the methanal content. The method has the advantages that compared with GB/T21126-2007, the derivation reaction time is shortened from 40 minutes to 15minutes, products are not required to be extracted by organic solvent, loss of derivation products is reduced, labor intensity is reduced, and chemicals are saved. Methodology experimental results of the method meet analysis requirements of samples, thereby achieving the purpose of quick analysis.

The invention discloses a composite silica gel column and a pretreatment method for simultaneously measuring multi-type persistent organic contaminants in sediments and biological samples. The composite silica gel column comprises glass wool, silver silicate silica gel, activated silica gel, alkaline silica gel, activated silica gel, first acid silica gel with the acid content of 40 wt%-50 wt%, second acid silica gel with the acid content of 20 wt%-25 wt%, activated silica gel and anhydrous sodium sulfate sequentially from bottom to top.

The invention discloses a method for collaboratively operating internal power supplies and external power supplies of a power grid with a large-scale power input from external regions. The method comprise steps of: predicting a maximum load, determining a minimum load in combination with a minimum daily load factor, and determining a peak-valley difference; determining a spinning reserve capacity according to a ratio of a load reserve to an accident reserve, and calculating a peak regulation capacity required by a system in combination with the peak-valley difference; calculating a peak regulation capacity surplus condition according to the peak regulation capacity required by the system and a peak regulation capacity provided by the system; determining the peak regulation capacity provided by the system according to the peak regulation capability and the minimum technical output power of each power supply in a current region; determining the minimum provided peak regulation capacity and installed capacity of a thermal power generating unit in the region according to a peak regulation capability balance requirement; and according to a reasonable percentage reserve, inversely deriving an agreed distribution capacity by the installed capacity of the thermal power generating unit under a maximum generation load. The method takes account of peak regulation balance, reduces the influence of uncertainty of input power from external regions on the power supplies in the region on the basis of reasonability of the installed capacities of the power supplies and the power structure in the region so as to increase the utilization time of the thermal power generating unit in the region.