摘要
研究了新显色剂2,7-双(5-羧基-1,3,4-三氮唑偶氮)-变色酸(简称BCTZACA)与Cu(的显色反应条件。结果表明,在pH5·0的HAc-NaAc介质中,Cu(与BCTZACA形成稳定的紫色络合物,络合物的λmax=570nm,试剂的λmax=489nm,络合物的表观摩尔吸光系数ε=4·58×104,Cu(在0~0·8mg/L范围内符合比尔定律。所拟方法直接用于镁合金和铝合金样品中微量铜的测定,加标回收率为101·8%~102·0%,RSD为1·9%~3·6%(n=6),结果满意。
The conditions of color reaction of a new reagent 2,7-bi(5-carboxy-1,3,4-triazolylazo)-chromotropic acid(BCTZACA) with copper? were presented.The results showed that the new color reagent had reacted with copper ? to form a stable purple complex in the medium of HAc-NaAc(pH 5.0) at (max)=570 nm.The apparent molar absorptivity was 4.5810~4 Lmol^(-1)cm^(-1). Beer's law was obeyed in the concentration range of 0-0.8 mg/L for Cu?.The method has been applied to the direct determination of copper in aluminium alloy and magnesium alloy with satisfactory results.The recovery of standard addition and RSDs were 101.8%-102.0% and 1.9%-3.6% (n=6),respectively.
出处
《冶金分析》
CAS
CSCD
北大核心
2005年第3期55-57,共3页
Metallurgical Analysis
