摘要
研究了新显色剂2-(2-咪唑偶氮)-5-二甲氨基苯甲酸(IZDBA)与铜的显色反应。结果表明,在pH4.0的HAc-NaAc缓冲溶液中,IZDBA与Cu(Ⅱ)形成稳定的摩尔比为2:1的紫红色络合物,其最大吸收波长为600nm,表观摩尔吸光系数为3.62×10^4L·mol^-1·cm^-1,Cu(Ⅱ)质量浓度在0.08~0.8mg/L范围内符合比尔定律。本方法可不经分离直接测定铝合金和镁合金样品中微量的铜,测定结果与认定值相符。
The color reaction of a new reagent 2-(2-imidazolylazo)-5-dimethylamino-benzoic acid(IZD- BA) with copper(Ⅱ) was studied spectrophotometrically. The results showed that the IZDBA reacts with copper(H) to form a 2 : 1 stable purple complex in the buffer solution of HAc-NaAc at pH 4.0. The maximum absorption wavelength is at 600 nm. The apparent molar absorptivity is 3.62 ×10^4 L· mol^-1·cm^-1. Beer's law is obeyed in the range of 0.08-0.8 mg/L for Cu(Ⅱ). The method has been used for the direct determination of copper in aluminium alloy and magnesium alloy samples. The results are in agreement with the certified values.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2007年第10期53-55,共3页
Metallurgical Analysis
基金
浙江省教育厅计划课题(20050051)