纳米二氧化锆微柱分离电感耦合等离子-质谱分析水样中铬的形态 |
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引用本文: | 曾艳,占红梅,胡斌. 纳米二氧化锆微柱分离电感耦合等离子-质谱分析水样中铬的形态[J]. 分析科学学报, 2010, 26(2). DOI: 10.3969/j.issn.1006-6144.2010.02.001 |
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作者姓名: | 曾艳 占红梅 胡斌 |
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作者单位: | 武汉大学化学与分子科学学院,湖北武汉,430072 |
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基金项目: | 教育部新世纪优秀人才支持计划项目 |
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摘 要: | 以纳米ZrO2为微柱填充材料,采用电感耦合等离子-质谱(ICP-MS)研究了Cr(Ⅵ)/Cr(Ⅲ)在纳米ZrO2微柱上的吸附性能。当pH值为8时,纳米ZrO2能完全吸附Cr(Ⅲ),而对Cr(Ⅵ)基本不吸附。对影响Cr(Ⅵ)和Cr(Ⅲ)分离的主要因素进行了详细研究,据此建立了纳米ZrO2微柱分离ICP-MS分析铬形态的新方法。方法对铬的检出限(3σ)为0.06ng/mL,定量测定下限(10σ)为0.37ng/mL,相对标准偏差为2.2%(n=9,c=100ng/mL)。本法选择性好、简便、快速,已用于不同水样中铬形态的测定,结果满意。
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关 键 词: | 纳米ZrO_2 电感耦合等离子-质谱 铬 形态分析 |
Nanometer-Sized ZrO_2 Microcolumn Separation Combined with ICP-MS for the Speciation of Chromium in Water Samples |
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Abstract: | A simple and convenient method has been developed for the speciation of Cr(Ⅲ) and Cr(Ⅵ) in water samples by nanometer-sized ZrO_2 microcolumn separation and ICP-MS detection. The adsorption behaviors of Cr(Ⅲ) and Cr(Ⅵ) on nanometer-sized ZrO_2 were studied and it was found that at pH=8.0 Cr(Ⅲ) could be quantitatively adsorbed by the microcolumn and Cr(Ⅵ) passed through the microcolumn directly. The main factors affecting the separation of Cr(Ⅲ) and Cr(Ⅵ) on nanometer-sized ZrO_2 were studied. Under the optimal conditions, the relative standard deviation for chromium was 2.2%(c=100 ng/mL,n=9), the limit of detection(3σ)was 0.06 ng/mL and the limit of determination (10σ) was 0.37 ng/mL. No obvious interference has been observed from the co-existed species. The proposed method has been successfully applied to the speciation of chromium in real water samples. |
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Keywords: | Nanometer-size ZrO_2 Chromium ICP-MS Speciation |
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