摘要
提出了运用吸光度比值-导数光谱法同时测定Cr(Ⅲ)与Cu(Ⅱ)含量的新方法。在pH5.7的HAc-NaAc的缓冲溶液中,Cr^3+,Cu^2+与铬天青S(CAS)和溴化十六烷基三甲胺(CTMAB)可分别形成蓝色三元络合物。其摩尔吸光系数分别为2.52×10^5L·mol^-1·cm^-1和1.01×10^5L·mol^-1·cm^-1。Cu^2+和Cr^3+的浓度分别在0.08~1.2μg·mL^-1和0.05~0.52μg·mL^-1范围内符合比尔定律,其检测限分别为0.014和0.013μg·mL^-1。此方法应用于环境水中Cr(Ⅲ),Cu(Ⅱ)的同时测定,取得了满意的结果。
In the present paper, an absorbance ratio-derivative method for the simultaneous determination of copper( Ⅱ ) and chromium( Ⅲ) was proposed. In the HAc-NaAc buffer solution at pH 5.7 with heating, Cr^3+ or Cu^2+ with CAS and CTMAB formed a blue ternary complex. The molar absorptivities of Cr( Ⅲ )-CAS-CTMAB and Cu( Ⅱ )-CAS-CTMAB were 2.52×10^5L·mol^-1·cm^-1 and 1.01×10^5L·mol^-1·cm^-1 respectively. Beer's law was obeyed in the range of 0.08-1.2 μg·mL^-1 for Cu( Ⅱ )and 0.05-0. 52 μg·mL^-1 for Cr( Ⅲ ). The detection limits of Cu( Ⅱ ) and Cr( Ⅲ ) are 0. 014 μg·mL^-1 and 0. 013 μg·mL^-1 respectively. This method was applied to the determination of Cu( Ⅱ ) and Cr(Ⅲ) in surrounding water with satisfactory results.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2006年第3期535-538,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金(20075016)资助项目
关键词
吸光度比值-导数光谱法
同时测定
铜
铬
铬天青S
Absorbance ratio-derivative method
Simultaneous determination
Copper(Ⅱ )
Chromium( Ⅲ)
Chrome azurol S