流动注射在线富集分离-火焰原子吸收光谱法测定水体中的铬(Ⅲ)和铬(Ⅵ)  

Simultaneous Determination of Chrominum(Ⅵ) and Chrominum(Ⅲ) in Water Sample Using Flow injection On-line Preconcentration and Separation With Flame Absorption Spectrometric Detection

作　　者：孔庆安[1] 吴奇藩[1] 郭璇华[1] 

机构地区：[1]华南理工大学应用化学系,广州510641

出　　处：《分析化学》1996年第1期1-5,共5页Chinese Journal of Analytical Chemistry

摘　　要：内装活性氧化铝（碱式）和阴离子交换树脂的微型柱流动注射在线富集分离水体中的铬（Ⅲ）和铬（Ⅵ），火焰原子吸收法直接检测。微型住可同时富集两种价态的离子，分别用1mol／L的NH4NO3和HNO3洗脱Cr（Ⅵ）和Cr（Ⅲ）于喷雾器中。进样时间25s，铬（Ⅵ）和铬（Ⅲ）的富集倍数分别为11倍和20倍，实际水样的加标回收率在90％～106％之间；分析速率为50个样／h；铬（Ⅵ）、铬（Ⅲ）的检出限（3δ）分别为1．5μg／L和0．7μg／L；相对标准偏差（50μg／L）分别为1．9％和2．6％。A direct, rapid and sensitive method for the determination of chrominum(Ⅵ ) and chrominum (Ⅲ ) in water samples by flame absorption spectrometry using on-line preconcen ration and separation on a microcolumn packed with anion resin and active alumina (basic form) was developed. Cr(Ⅵ ) and Cr(Ⅲ) could be adsorbed sirnultaneously by the microcol umn, and were eluted directly to the nebulizer by 1 mol/L NH4NO3 and HNO3. The concen tration enhancement of Cr(Ⅵ) and Cr(Ⅲ ) was 11 and 20 time for 25 s sample loading. Ana lytic frequency was 50. samples/h, and recovery of 90% ~ 105% was obtained from mature water. Detection limit (3s ) was 1. 5 and 0. 7μg/L with relative standard deviations (50 μg/L) of 1. 9% and 2. 6% for Cr(Ⅵ ) and Cr(Ⅲ ), respectively.

关 键 词：流动注射分析 原子吸收光谱 铬 水样 

分 类 号：O614.611[理学—无机化学] O657.31[理学—化学]