Shawket Abliz, Wang Ji-De
College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2005 Dec;25(12):2082-4.
A rapid and sensitive method for the sequential determination of Cr(VI) and Cr(III) in water samples based on flame atomic absorption spectrometry with TOA-benzene extraction separation system has been developed. In the H2SO4 medium. Cr(VI) in sample solution was extracted into the organic phase by using the TOA-Benzene and Cr(III) remained in the water phase. Cr(VI) in the organic phase and Cr(III) in the water phase were determined separately by AAS. This method is simple, fast and of microscale. The results obtained by this method agreed well with those obtained by conventional method. The recoveries are 95.0%-102% for Cr(VI) and 94.8-103% for Cr(III). The relative standard deviations were 2.9% for Cr(VI) and 2.6% for Cr(Ill). The system has enrichment effect for Cr(VI), and the detection limits are 6.6 microg x L(-1) for Cr(VI) and 0.20 mg x L(-1) for Cr(III). The maximum extracted amount of Cr(VI) by TOA was 4.6 mg x mL(-1).
基于三辛胺-苯萃取分离系统的火焰原子吸收光谱法，开发了一种快速灵敏地顺序测定水样中Cr(VI)和Cr(III)的方法。在硫酸介质中，样品溶液中的Cr(VI)用三辛胺-苯萃取到有机相中，Cr(III)留在水相中。分别用原子吸收光谱法测定有机相中的Cr(VI)和水相中的Cr(III)。该方法简单、快速且为微量分析。该方法得到的结果与传统方法得到的结果吻合良好。Cr(VI)的回收率为95.0%-102%，Cr(III)的回收率为94.8%-103%。Cr(VI)的相对标准偏差为2.9%，Cr(III)的相对标准偏差为2.6%。该体系对Cr(VI)有富集作用，Cr(VI)的检出限为6.6μg·L⁻¹，Cr(III)的检出限为0.20mg·L⁻¹。三辛胺对Cr(VI)的最大萃取量为4.6mg·mL⁻¹。
