| 2,7-双(5-羧基-1,3,4-三氮唑偶氮)-变色酸分光光度法测定铜的研究 |
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| 引用本文： | 陈红,葛昌华,梁华定,潘富友. 2,7-双(5-羧基-1,3,4-三氮唑偶氮)-变色酸分光光度法测定铜的研究[J]. 冶金分析, 2005, 25(3): 55-57 |
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| 作者姓名： | 陈红 葛昌华 梁华定 潘富友 |
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| 作者单位： | 台州学院生命科学与医药化工学院化学系,浙江台州,317000 |
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| 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。
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| 关 键 词： | 铜 2，7-双（5-羧基-1，3，4-三氮唑偶氮）-变色酸 分光光度法 |
| 文章编号： | 1000-7571(2005)03-0055-03 |
Spectrophotometric determination of copper with 2,7-bi(5-carboxy-1,3,4-triazolylazo)-chromotropic acid |
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| CHEN Hong,GE Chang-hua,LIANG Hua-ding,PAN Fu-you. Spectrophotometric determination of copper with 2,7-bi(5-carboxy-1,3,4-triazolylazo)-chromotropic acid[J]. Metallurgical Analysis, 2005, 25(3): 55-57 |
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| Authors: | CHEN Hong GE Chang-hua LIANG Hua-ding PAN Fu-you |
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| Abstract: | 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. |
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