Method for measuring arsenic and mercury in water by hydride generation-atomic fluorescence spectrometry

Abstract

The invention belongs to the field of water environment monitoring methods, in particular to a method for measuring arsenic and mercury in water by hydride generation-atomic fluorescence spectrometry. The method comprises the following steps of: a) preparing a mixed sample solution which contains the arsenic and the mercury; b) generating arsine vapor and mercury vapor by using the mixed sample solution and a potassium borohydride solution; and c) introducing the arsine vapor and the mercury vapor into an atomizer by using a carrier gas, exciting the arsine vapor and the mercury vapor by using a special hollow cathode light source to generate atomic fluorescence, detecting the intensity of the atomic fluorescence, and calculating the content of the corresponding components in the sample solution by utilizing the direct proportion relationship of the fluorescence intensity with the content of the arsenic and the mercury in the solution. By using the method, the content of the arsenic and the mercury in environmental water can be measured at the same time; the method is operated simply and quickly; and labor, time and reagents are saved.

Description

technical field [0001] The invention belongs to the field of water environment monitoring methods, in particular to a method for determining arsenic and mercury in water by hydride generation atomic fluorescence spectrometry. 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 separately, which...

AI Technical Summary

Problems solved by technology

In the prior art, the content of arsenic or mercury in environmental water is usually measured separately, which takes a lot of time and manpower, and also consumes more reagents and equipment, which affects the measurement speed. Therefore, it is of great practical significance to design and measure the content of arsenic and mercury in the water environment at the same time.