摘要
合成了一种新显色剂4-(4-氯苯重氮基)氨基-4′-氯偶氮苯(简称CDACAB)并研究了其与镍(Ⅱ)的显色反应。结果表明,在Triton X-100存在下和pH 10.0的Na2B4O7-NaOH缓冲介质中,该试剂与Ni(Ⅱ)形成稳定的红色络合物,最大吸收波长位于538nm,表观摩尔吸光系数ε=1.58×105 L.mol-1.cm-1,镍(Ⅱ)的质量浓度在0～0.7μg/mL范围内遵守比耳定律。通过用氟化钠和硫脲掩蔽Al 3+、Fe3+、Cu2+、Pd2+等干扰离子后,方法可直接测定铝合金中微量镍。铝合金标准样品中镍的测定值与认定值相符,相对标准偏差为1.6%～2.5%。
A new coloring reagent 4-（4-chlorobenzenediazo）-amino-4＇-chloroazobenzene （CDACAB）was synthesized and its coloring reaction with nickel （Ⅱ） was studied. The results showed that this reagent could form a stable red complex with Ni （Ⅱ） in Na2B4OT-NaOH buffer medium at pH 10.0 in the presence of Triton X-100. The maximum absorption wavelength was 538 nm, and the apparent molar absorptivity was ε=1.58×105 L.mol-1.cm-1. The Beer＇s law was obeyed for mass fraction of nickel （Ⅱ） in the range of 0--0.7μg/mL. After adding masking reagent, this method could be applied to the direct determination of micro nickel in aluminum alloy. The results were consistent with the certi-fied values, and the relative standard deviation was 1.6 %--2.5%.
出处
《冶金分析》
CAS
CSCD
北大核心
2012年第5期36-39,共4页
Metallurgical Analysis
基金
河南省科技攻关计划项目(082102270035)
河南省教育厅科技攻关课题(2008B150001)
安阳市科技攻关课题(20093473)
