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Pretreatment method for sewage sample during measurement of arsenic and mercury in water by fluorescent spectrometry

A technique of fluorescence spectroscopy and atomic fluorescence spectroscopy, which is applied in the field of pretreatment of sewage samples when fluorescence spectroscopy is used to determine arsenic and mercury in water, and can solve the problems of difficult and accurate measurement results

Inactive Publication Date: 2012-10-03
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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  • Abstract
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Problems solved by technology

Clean groundwater and surface water can be directly sampled for measurement without special treatment, while if sewage is directly sampled for fluorescence spectrum measurement, the measurement results are difficult to be accurate

Method used

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Embodiment Construction

[0009] The technical solutions of the present invention will be described in further detail below in conjunction with specific embodiments.

[0010] 1.1 Principle

[0011] For environmental water samples, arsenic in the sample solution reacts with potassium borohydride to generate arsine in the hydride generation system, and mercury reacts with potassium borohydride to generate atomic mercury vapor.

[0012] Arsine and mercury vapor are directly introduced into the quartz atomizer from the carrier gas (argon), and then atomized in the argon-hydrogen flame. The ground state atoms are excited by the special hollow cathode lamp light source to produce atomic fluorescence. By detecting the intensity of atomic fluorescence, the content of the corresponding components in the sample solution is calculated by using the fluorescence intensity in direct proportion to the content of arsenic and mercury in the solution.

[0013] 1.2 Instruments and reagents

[0014] AFS-830 dual-channel...

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Abstract

The invention belongs to the field of water environment monitoring methods, in particular to a pretreatment method for a sewage sample during the measurement of arsenic and mercury in water by fluorescent spectrometry. The pretreatment method is characterized by comprising the following steps of: transferring 10 ml sewage sample in a 25 ml colorimetric tube; respectively adding 2.5 ml of 50 g.L<-1> thiourea solution and 2.5 ml of 5 to 10 percent hydrochloric acid solution, diluting to the scale and shaking uniformly. The fluorescent spectrometry is hydride generation atomic fluorescence spectrometry; and the solution used for measuring the arsenic and the mercury in the water by the fluorescent spectrometry is a potassium borohydride solution. By the pretreatment method, the sewage sample is pretreated, so that the measurement results of the content of the arsenic and the mercury are accurate and available.

Description

technical field [0001] The invention belongs to the field of water environment monitoring methods, and in particular relates to a pretreatment method for sewage samples when measuring arsenic and mercury in water by fluorescence spectroscopy. Background technique [0002] Arsenic and mercury are toxicological indicators in various water bodies. The water quality standards for various water bodies in my country have strictly regulated the content of arsenic and mercury. Arsenic and mercury in environmental water are required items for environmental monitoring. The determination of arsenic in the past multi-purpose atomic absorption spectrometry, atomic fluorescence spectrometry and inductively coupled plasma emission spectrometry. The determination of mercury is the reduction of stannous chloride or potassium borohydride atomic fluorescence spectrometry, and dithizone photometry. In the prior art, the content of arsenic or mercury in environmental water is usually measured ...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N1/38
Inventor 赵昌平
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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