Consideration of selenium concentration analysis in wash smoke drainage at industrial waste incineration facilities

Abstract

Kureha Ecology Management Co., Ltd. processes a variety of industrial waste, including waste containing selenium (Se). After incineration, the discharge of Se is subject to standard values, requiring appropriate measures. Of particular concern is the presence of hexavalent selenic acid SeO₄^2- (referred to as Se(VI)) and tetravalent selenous acid SeO₃^2- (referred to as Se(IV)) in the drainage, necessitating measurement techniques for each valence state. While our company measures total Se using ICP/MS, we lack the capability for valence-specific measurements. Therefore, we have launched an IC-ICP/MS system capable of simultaneously separating and measuring elements, to assess the practicality of valence-specific analysis of Se. This method has been confirmed to clearly separate and quantify Se(IV) and Se(VI). Furthermore, it is anticipated that this approach, which allows valence-specific measurements for other elements such as arsenic, boron compounds, and hexavalent chromium, will contribute to the maintenance and management of waste treatment facilities and the establishment of drainage treatment technologies.