Determination method for tin in disordered exhaust gas

A technology of fugitive emission and measurement method, which is applied in the preparation of test samples, measurement of color/spectral characteristics, etc., can solve problems such as boiling splash, easy boiling splash, loss, etc., and achieve accurate results, reasonable and feasible methods, and low cost. low effect

Inactive Publication Date: 2013-09-04
谱尼测试集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing technologies all use filter membranes or filter cartridges for wet digestion sampling. There are many deficiencies in the sample digestion part. The glass fiber filter membrane is heated and digested by an electric heating plate, which is prone to boiling and splashing, resulting in losses. Even if the glass fiber filter membrane is digested by microwave , there is still boiling splashing phenomenon when acid is waved after digestion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Utilize the method of the present invention to collect and measure the tin in the unorganized exhaust waste gas of a certain place, comprise the following main steps:

[0025] 1. Sampling

[0026] Atmospheric sampler for sampling, the sampling flow rate is 100L / min, and the sampling time is 90min.

[0027] 2. Pretreatment

[0028] Cut the glass fiber filter membrane into pieces, place it in a 50mL colorimetric tube, add 15mL nitric acid to vortex, and sonicate at 80°C for 30min, then add 15mL of water, vortex and mix, and continue to sonicate at 80°C for 30min. Filter with filter paper, collect the filtrate in a 250mL Erlenmeyer flask, rinse the colorimetric tube and filter paper with 6mol / L hot nitric acid, combine the filtrate, heat and concentrate on the electric heating plate to 2-3mL, transfer to a 25mL volumetric flask, and use ultrapure Make up to the mark with water, shake well to be tested. At the same time, take a blank glass fiber filter membrane and prepa...

Embodiment 2

[0046] According to the mode of embodiment 1, the tin in the unorganized exhaust gas is collected 12 times, and each filter membrane collected for 12 times is divided into two equal parts, one part is tested as a sample, and the other part is carried out in the standard addition recovery experiment. The scalar quantities were 0.25 μg and 1 μg respectively, and 6 parallel samples were measured for each scalar quantity, and the determination was carried out according to the steps in Example 1. The average recoveries were 95.7% and 97.1%, respectively, and the relative standard deviations were 5.9% and 4.7%, respectively.

[0047] Obviously, those skilled in the art can use the present invention to measure the tin in fugitive exhaust gas.

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Abstract

The invention relates to a determination method for tin in a disordered exhaust gas. The determination method comprises the steps of collecting the tin in the disordered exhaust gas by using glass fibers; cutting up a filter film that is sampled; adding nitric acid to perform ultrasonic heat extraction; then adding 15 mL of water, mixing uniformly; continuously performing the ultrasonic heat extraction; filtering the extracted liquid, concentrating the filtrate by heating on an electric hot plate; diluting to a constant volume; determining the tin content by graphite furnace atomic absorption spectrometry, with lanthanum nitrate as a matrix modifier. The nitric acid ultrasonic heat extraction is adopted by the method, so that the tin enriched in the filter film can be effectively extracted without a boiling and splashing phenomenon, thereby preventing loss of the tin; the extracted liquid is diluted to the constant volume, so that acidity of the solution is reduced, thereby reducing corrosion of strong acid to graphite tubes; and the matrix improver is added, so that interference is reduced, thereby increasing stability and reproducibility of the method.

Description

technical field [0001] The invention relates to a method for measuring tin in fugitive exhaust gas, in particular to a method for measuring tin in fugitive exhaust gas by graphite furnace atomic absorption spectrometry. Background technique [0002] As a commonly used metal, tin is widely used in alloys, solder, glass, enamel, dyes, textiles, printing and dyeing, pharmaceuticals, and electronics industries. Tin and its compounds in the ambient air mainly come from the mining, smelting, processing and use of tin and accidents such as running, emitting, dripping and leaking in the process, which bring harm to the healthy human body. Long-term exposure to high concentrations of inorganic tin dust can cause eye, throat and respiratory irritation symptoms, can cause obvious X-ray changes in the lungs, and can cause damage to the nervous system, liver function, skin and mucous membranes. [0003] The existing technologies all use filter membranes or filter cartridges for wet dige...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/33G01N1/28
Inventor 宋薇
Owner 谱尼测试集团股份有限公司
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