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研究了痕量铬形态分析的三正辛胺(TOA)-苯萃取分离体系-原子吸收光谱法。用三正辛胺(TOA) 和苯在H2SO4介质中把水相中的Cr(Ⅵ)萃入到有机相而Cr(Ⅲ)留在水相中,使两种形态的Cr分离到两相 中后对有机相的Cr(Ⅵ)和水相的Cr(Ⅲ)进行AAS测定,可求得Cr(Ⅵ)和Cr(Ⅲ)的含量,该方法对实际水 样加标回收率分别在95．0％-102％和94．8％-103％之间,相对标准偏差分别为2．9％和2．6％,体系对 Cr(Ⅵ)有富集作用,对Cr(Ⅵ)和Cr(Ⅲ)的检出限分别为6．6μg·L-1和0．20 mg·L-1,TOA对Cr(Ⅵ)的最佳 萃取量为4．6 mg·mL-1,该法简单、快速、准确。
A three-octylamine (TOA) -benzene extraction and separation system for trace chromium speciation was studied by atomic absorption spectrometry. Cr (¢ ö) in the aqueous phase is extracted into the organic phase with tri-n-octylamine (TOA) and benzene in H2SO4 medium while Cr (¢ ó) is left in the aqueous phase. The two forms of Cr are separated into two phases After AAS determination of Cr (Ⅵ) in organic phase and Cr (Ⅲ) in aqueous phase, the recoveries of Cr (Ⅵ) and Cr (Ⅲ) were obtained. The relative standard deviations (RSDs) were between 0% -102% and 94.8% -103%, and the relative standard deviations were 2.9% and 2.6%, respectively. The enrichment of Cr (Ⅵ) The detection limits of Ⅲ were 6.6μg · L-1 and 0.20 mg · L-1, respectively. The optimum extraction amount of TOA for Cr (Ⅵ) was 4.6 mg · mL-1. The method was simple, Fast and accurate.