Concentration analysis method

A technology of concentration analysis and intensity, which is applied in the field of chemical element concentration analysis and concentration analysis, can solve the problems of high cost of instrument system accessories, long instrument analysis process, and difficulty in portability, etc., to extend the calibration cycle, improve analysis accuracy, and analyze The effect of simple process

Inactive Publication Date: 2014-06-18
南京智谱工业技术有限公司
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  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the existing traditional elemental analysis technology, there are technical problems such as long instrument analysis process, high cost of instrument system and accessories, large background interference, poor sensitivity, and difficult portability, etc., thereby providing a An elemental concentration analysis method with fast analysis speed, low equipment cost, strong anti-interference ability, high sensitivity, and easy automation and portability

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Embodiment 1

[0062] This embodiment provides a method for analyzing the concentration of selenium in rice, such as figure 1 Shown is the analysis flowchart of described elemental concentration analysis method, and it comprises the following steps:

[0063] (1) Sample pretreatment:

[0064] Weigh 2.50g of the rice sample to be tested, add 25mL of mixed acid, let it stand overnight (more than 12 hours), then heat and digest until the solution is colorless and transparent; among them, the mixed acid is 1.40g / mL nitric acid (excellent grade) and 1.68g / mL perchloric acid (excellent grade) is mixed and prepared according to the volume ratio of 4:1;

[0065] When the volume of the solution is heated to 1-2mL, take it off and cool it, add 5mL of 6mol / L hydrochloric acid, heat until the solution becomes colorless and white smoke appears, then the element selenium in the rice sample to be tested is reduced from hexavalent selenium into tetravalent selenium, after cooling, the solution was transfe...

Embodiment 2

[0076] This embodiment provides a method for analyzing the concentration of arsenic in drinking water, which includes the following steps:

[0077] (1) Under acidic conditions, use 0.4% KI solution to first reduce the pentavalent arsenic in the sample to be tested to trivalent arsenic, and then use 1.5% KBH 4Solution (which contains 0.2% ascorbic acid as a sensitizer) reduces trivalent arsenic to negative trivalent arsenic in a slightly acidic solution, and the reaction time is 1h to obtain AsH 3 gas;

[0078] (2) Input nitrogen from the carrier gas input unit as a carrier gas, and convert the gaseous hydride AsH to 3 Input the sample gas into the multiple reflection spectrum absorption chamber for analysis. When the laser with wavelength λ is coupled into the chamber, the output amplitude of the circuit is automatically monitored by the photoelectric sensor for detection. When the output amplitude is higher than the preset The value is 3.5V, that is, the laser intensity in ...

Embodiment 3

[0087] The present embodiment provides a method for analyzing the concentration of nitrogen in milk powder, which is based on the Kjeldahl method, and through the improvement of the method of the present invention, simply and accurately measures the content of total nitrogen in milk powder; it includes the following steps:

[0088] (1) Sample pretreatment:

[0089] Weigh 0.50g milk powder, put it in the Kjeldahl flask, add 8.5g K 2 SO 4 , 0.4gCuSO 4 .5H 2 0 and 15ml of concentrated sulfuric acid, add a few glass balls to heat slowly and minimize the generation of foam to prevent the solution from splashing, and ensure that the sample is completely immersed in the sulfuric acid; after the foam in the milk powder sample disappears, increase the firepower until the solution is clear, and continue heating for 1 hour Cool to room temperature; add 50ml of pure water to dissolve salts, transfer to a 100ml volumetric flask after cooling, rinse the flask with pure water several time...

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Abstract

The invention relates to a concentration analysis method. The method comprises the following steps: pretreating a sample to be measured; converting an element to be measured into a gaseous compound; introducing the gaseous compound of the element to be measured into a multi-reflection spectral absorption cavity through carrier gas; detecting the attenuation of the laser power in the cavity to obtain a gas laser absorption spectral line; calculating the concentration of a gaseous compound of the element to be measured. In the method, a molecular absorption spectral line is directly adopted for analyzing without using consumable instruments such as a chromatographic column or accessories such as an atomization furnace or an ionization furnace or being interfered with background absorption and fluorescence. In the method, the absolute absorption of light is analyzed by using the sample without frequently making a standard measuring curve as being done for an atomic spectra and the like, so that the measuring flow can be simplified, and the scalar period can be prolonged on a large scale to realize instant measurement, so that the automation and the convenience in measurement are realized. The method has the advantages of high analysis speed, low equipment cost, high sensitivity and accurate measurement.

Description

technical field [0001] The invention relates to a concentration analysis method, which belongs to the technical field of concentration analysis of chemical elements. Background technique [0002] In social production and scientific research, qualitative and quantitative detection and analysis of chemical elements of related materials and minerals are often required. Among them, there are many methods for quantitative analysis of elements, which can be divided into two categories: direct analysis and indirect analysis. [0003] The direct analysis method is to analyze the initial form of the elements in the sample, while the indirect analysis method needs to change the initial form of the elements in the sample before analyzing. [0004] At present, X-ray fluorescence spectroscopy (XRF) is the most commonly used direct analysis method for quantitative analysis of elements in the field exploration industry. This method uses the principle of X-ray fluorescence energy dispersion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 邓文平
Owner 南京智谱工业技术有限公司
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