摘要
采用氢化物-原子荧光光度法(HG-AFS),测定天然水体中的总溶解态无机锑(Sb(Ⅴ+Ⅲ))和三价锑(Sb(Ⅲ))。选择的最佳仪器条件为:灯电流60 mA,负高压-260 V,原子化器的温度190℃和氩气的载气流量600 mL/min。Sb(Ⅴ+Ⅲ)在1 mol/L HCl介质中进行测定,检出限为0.024μg/L,线性范围为0~14μg/L。对浓度0.3μg/L和0.03μg/L的样品分析精密度分别为2.0%和1.9%(n=9),方法的回收率93.7%~105%。Sb(Ⅲ)是在柠檬酸和柠檬酸钠缓冲溶液中(pH为4.0~4.5),辅以100 mL/min的氢气进行测定,测得检出限为0.0013μg/L,对浓度0.04μg/L和0.01μg/L的样品分析精密度分别为3.8%和5.5%(n=9),方法的回收率91.1%~104%。二者在不同介质中工作曲线的斜率变动范围均小于5%。Sb(Ⅴ)的含量由总溶解态无机锑与三价锑的含量差减得到。
A method for the determination of Sb (V +III) and Sb (III) by atomic fluorescence spectrometry (AFS) in natural water was established in this study. The optimal instrumental parameters were electric current, 60 mA; voltage, -260 V; temperature, 190℃; and Ar flux, 600 mL/min. The method was based on the behavior of total antimony (Sb(V+III)) and antimony (III) under different acidic conditions. Total antimony was determined at 1 mol/L HCl; and antimony (III) was determined at pH =4.0-4.5. Under optimized conditions, the detection limit (30) for Sb (V+III) and Sb(III) were 0.024 μg/L and 0.0013 μg/L, respectively. For total antimony, the precision for the sample of 0.3 μg/L or 0.03 μg/L was 1.95% or 1.92%, respectively (n = 9). The linearity was 0-14μg/L. For antimony (III), the precision for the sample of 0.04 μg/L or 0.01 μg/L are 3.8% or 5.5%, respectively (n = 9). The recoveries for Sb(V+III) and Sb(III) are 93.7%-105% and 91.1% -104%, respectively. The method can be used directly to the determination of Sb (V+III) and Sb (III) in natural water.
出处
《海洋科学》
CAS
CSCD
北大核心
2011年第4期37-43,共7页
Marine Sciences
基金
国家重点基础研究发展规划项目(2006CB400601)
国家自然科学青年基金项目(40606028)
作者简介
万玉霞(1983-),女,山东青岛人,硕士研究生,主要从事海洋生物地球化学研究,E-mail:yuxiawan@yeah.net;
任景玲,通信作者,电话:13573866779,E-mail:renjing1@ouc.edu.cn