流动注射在线预富集分离-火焰吸收光谱法测定水中的铬（III）和铬（VI）
[Determination of chromium(III) and chromium(VI) in water using flow injection on-line preconcentration and separation with flame absorption spectrometric detection].
作者信息
Kang Wei-jun, Liang Shu-xuan, Ha Jing, Shen Shi-gang, Sun Han-wen
机构信息
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China.
出版信息
Guang Pu Xue Yu Guang Pu Fen Xi. 2003 Jun;23(3):572-5.
A rapid and sensitive method for the sequential determination of Cr(III) and Cr(VI) in water samples based on flow injection on-line preconcentration and separation with two-microcolumn system-flame atomic absorption spectrometry has been developed. The Cr(III) and Cr(VI) in water samples were respectively retained in a microcolum with cation exchange resin and in a microcolumn with anion exchange resin and were eluted directly by 15% HNO3 and 8% NH4NO3, respectively. The characteristic concentrations (pre-concentration time of 1 min) for Cr(III) and Cr(VI) were 1.50 micrograms.L-1 and 1.39 micrograms.L-1, respectively, The relative standard deviations at 10 micrograms.L-1 level were 3.41% and 1.80%, and the corresponding detection limits (3 sigma) were 1.03 micrograms.L-1 and 0.54 microgram.L-1, respectively. The satisfactory recovery of 93.48%-107.5% could be obtained from water samples.
基于流动注射在线预富集和分离的双微柱系统-火焰原子吸收光谱法，建立了一种快速灵敏地顺序测定水样中Cr(III)和Cr(VI)的方法。水样中的Cr(III)和Cr(VI)分别保留在装有阳离子交换树脂的微柱和装有阴离子交换树脂的微柱中，分别用15% HNO3和8% NH4NO3直接洗脱。Cr(III)和Cr(VI)的特征浓度（预富集时间1分钟）分别为1.50微克·L-1和1.39微克·L-1，在10微克·L-1水平下的相对标准偏差分别为3.41%和1.80%，相应的检测限（3σ）分别为1.03微克·L-1和0.54微克·L-1。水样的回收率为93.48%-107.5%，结果令人满意。
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