悬浮液进样-石墨炉原子吸收光谱法测定生物样品中微量铬
Direct Determination of Trace Chromium in Biological Samples by Graphite Furnace Atomic Absorption Spectrometry with Slurry Introduction
摘 要
提出了固体悬浮液进样石墨炉原子吸收光谱法直接测定铬的方法,并对各分析条件进行了优化.采用1.2 g·L-1琼脂溶液为悬浮剂,将样品均匀悬浮于其中,由自动进样器直接将样品悬浮液注入石墨炉中,加入基体改进剂,石墨炉原子吸收光谱法测定生物样品中铬.在优化的试验条件下,方法的检出限(3σ)为0.5 μg·L-1.铬的质量浓度在50 μg·L-1以内呈线性关系,回归方程为A=0.252 1 C+0.031 1,样品加标回收率为98.6%~103.2%.
悬浮液进样
生物样品
铬
GFAAS
Slurry sample introduction
Biological sample
Chromium铬(Ⅵ)
Abstract
A method for the direct determination of chromium in biological samples by Graphite Furnace Atomic Absorption Spectrometry with slurry sample introduction was proposed,and analytical conditions for determination were optimized.The sample was homogeneously suspended in 1.2 g·L-1 agar sol and injected into the graphite furnace by an auto-sampler,and chromium in the biological samples was determined directly using magnesium nitrate as a matrix modifier.Under the optimized experimental conditions,detection limit (3σ) of this method was found to be 0.5 μg·L-1.Linearity was kept between values of peak height and concentration of Cr(Ⅲ) in the range within 50 μg·L-1,corresponding to the linear regression equation of A=0.252 1 C+0.0311.Values of recovery found were in range of 98.6%-103.2%.
中图分类号 O657.3
所属栏目 工作简报
基金项目
收稿日期 2006/12/15
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备注张锂(1964-),女,河北省乐亭人,高级工程师,硕士,从事工程化学和冶金分析的科研和化工产品质量检测工作.
引用该论文: ZHANG Li,HAN Guo-cai. Direct Determination of Trace Chromium in Biological Samples by Graphite Furnace Atomic Absorption Spectrometry with Slurry Introduction[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2008, 44(4): 361～363
张锂,韩国才. 悬浮液进样-石墨炉原子吸收光谱法测定生物样品中微量铬[J]. 理化检验－化学分册, 2008, 44(4): 361～363
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参考文献
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【3】李艳方,李方.环境中无机铬形态分析研究进展[J].化学研究与应用,2000,12(5):476-481．
【4】池泉,史建波,梅俊,等.石墨炉原子吸收光谱法测定土壤中可交换态Cr(Ⅲ)和Cr(Ⅵ)[J].分析试验室,2002,21(2):63-66．
【5】梁桦,何华焜.水中铬形态的石墨炉原子吸收分析-双颗粒树脂法[J].分析化学,1990,18(12):1142-1144．
【6】蒋晓青,蔡乾涛,施文赵.痕量铬的吸附溶出伏安法测定及其形态分析[J].上海环境科学,1992,11(3):26-28．
【7】严规有,商桂兰,夏娇云,等.生物样品中痕量铬的直接快速测定[J].分析化学,2004,32(1):128．
【8】Hinds M W,Jackson K W.Determination of lead and cadmium in potable waters by atom-trpping atomic sbsorption spectrophotometry[J].Analyst,1985,110:497．
【9】赵泰,Rene Nowka.新技术应用-直接固体进样石墨炉分析[J].岩矿测试,2003,22(1):79-80．
【10】何桂华,张欣,周波,等.悬浮进样石墨炉原子吸收测定食品中的砷[J].理化检验-化学分册,1999,35(10):437-439．
【11】邓世林,李新凤,邓富良.固体悬浮液进样石墨炉原子吸收法测定茶叶中微量镉[J].食品科学,2004,25(2):141-143．
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