(一)引言在环保工作中具有重要意义的硒,通常用氢化物-原子荧光法测定。关于测定硒时其他元素的干扰及其消除已有一些报导,但其机理尚不清楚,以致干扰元素的允许存在量较低。本文根据元素干扰的可能机理,提出了一种较为方便的消除干扰方法,从而使一些元素,例如铜的允许存在量比文献报导的增加很多,而对Pd~(2+),As~(3+)和Bi~(3+)等元素的干扰也有较好的抑制作用。 (二)实验方法的考虑 1.如果把氢化物-原子荧光法中的主要反应分为三步:(1)水相中待测元素的被还原 (A) Introduction Selenium, which is of great importance in environmental protection, is usually measured by hydride generation-atomic fluorescence spectrometry. There have been some reports on the interference of other elements in the determination of selenium and their elimination, but the mechanism is not clear, so that the amount of interfering elements allowed to exist is low. According to the possible mechanism of element interference, a more convenient method to eliminate interference is proposed, which makes the allowable content of some elements such as copper increase much more than that reported in the literature, but for Pd ~ (2 +), As ~ (3) +) And Bi ~ (3 +) and other elements of interference also have a better inhibitory effect. (B) experimental considerations 1. If the main reaction hydride - atomic fluorescence method is divided into three steps: (1) the aqueous phase of the element to be measured is reduced