液体硅肥中砷形态的氢化物发生原子荧光光谱分析

Speciation Analysis of Arsenic in Liquid Siliceous Fertilizer by Hydride Generation Atomic Fluorescence Spectrometry

本文应用氢化物发生-原子荧光光谱法（HG—AFS）测定了液体硅肥中不同形态的砷含量。研究了酸介质、还原剂和增感剂对砷的荧光信号的影响。实验确定酸介质为2．5mol·L^-1HCl，还原剂和增感剂为5％硫脲＋5％抗坏血酸混合溶液。在选定的实验条件下测得硅肥中三价砷、五价砷及总砷的含量分别为5．08ng·L^-1、0．72ng·L^-1、5．80ng·L^-1。三价砷和五价砷的检出限分别为72．0ng·L^-1和153ng·L^-1；方法的精密度为2．2％～4．1％，回收率为96．5％～104％。

Speciation analysis of arsenic in liquid siliceous fertilizer was determined by hydride generation atomic fluorescence spectrometry. The influence of acid medium and reducing reagent on the fluorescence intensity of arsenic were studied. The detection limits of 72.0 ng,L^-1As（Ⅲ） and 153 ng·L^-1 As（V） were obtained with the precision of 2.2 %-4.1%. The recovery for the spiked samples are in the range of 96.5%-104%.