Atomic fluorescence spectroscopic spectrometry analysis method and device for on-line pre-reduction of trivalent arsenic and pentavalent arsenic

Abstract

The invention provides a method of an atomic fluorescence spectrometry shape analysis by on-line pre-reducing trivalent arsonium and quinquivalent arsonium, the method comprises the following steps: (a) mixing a first arsenical sample and a first reducing agent under the temperature of 65-75 DEG C and performing a reduction of quinquivalent arsonium; (b) mixing a second arsenical sample and a second reducing agent, and determining the concentration of trivalent arsonium by the generated hydride after mixing; (c) mixing a solution obtained by reducing quinquivalent arsonium in the step (a) with the second reducing agent, and determining the concentration of total arsonium by the generated hydride after mixing. The invention also discloses an apparatus for using the method. According to theon-line pre-reduction of quinquivalent arsonium, the method of the invention is capable of effectively solving the interference problem between the valences, avoiding manual pre-treating processes inthe off-line reduction and realizing an automatic and rapid analysis of arsenic shape.

Description

Technical field: [0001] The present invention relates to the field of spectroscopic analysis of elements by fluorescence spectrum, in particular to a method and device for speciation analysis of trivalent arsenic and pentavalent arsenic in seawater, which uses an online pre-reduction method of pentavalent arsenic to realize the quantification of trivalent arsenic and pentavalent arsenic analyze. Background technique: [0002] my country is a large maritime country with a large population and scarce land resources, but has an exclusive area of ​​more than 3 million square kilometers. Seawater is a very precious and limited natural resource. At present, with the rapid social and economic development in coastal areas, marine engineering construction and marine development activities are becoming more and more frequent. A large amount of industrial wastewater and domestic sewage are discharged into the sea through channels such as rivers, direct sewage outlets of enterprises, a...

AI Technical Summary

Problems solved by technology

However, since the reaction system of hydride generation atomic fluorescence spectrometry requires a certain acidity to meet the requirements of forming an argon hydrogenation flame, the interference of pentavalent arsenic is unavoidable in the analysis of trivalent arsenic, which ultimately affects the practical application of this method.

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