摘要
研究了对硝基重氮氨基偶氮苯与镍的显色反应。在表面活性剂Triton X-60存在下,于pH 9.9的氢氧化钠—硼砂缓冲溶液中,镍与该试剂形成稳定深红色络合物,其最大吸收波长位于500nm处,表观摩尔吸光系数为1.33×10~5L·mol^(-1)·cm^(-1)。25mL溶液中,镍量在0～5μg范围内符合比尔定律。Ag^+,Co^(2+),Hg^(2+),Cd^(2+),Cu^(2+),Pd^(2+)干扰镍的测定,加入氟化钠和硫脲混合掩蔽剂后,可提高Al^(3+),Fe^(3+),Cu^(2+)的允许量。方法用于环境水样中镍的测定,相对标准偏差为2.4%～3.7%,回收率为95.5%～103.5%。
The color reaction of p-nitrodiazoaminoazabenzene with nickel has been studied. In the presence of Triton X-60 and in the buffer of sodium hydroxide-borax at pH 9.9, nickel（Ⅱ） reacts with p- nitrodiazoaminoazabenzene to form a stable red complex, of which the maximum absorption is at 500 nm, and the apparent molar absorptivity is 1.33 ×10^5L·mol^-1·cm^-1. Beer＇s law is obeyed in the range of 0-5 μg for nickel in 25mL solution. Ag^＋,Co^2＋,Hg^2＋,Cd^2＋,Cu^2＋,Pd^2＋ interfere in the determination. The tolerant dosage increment of Al^3＋,Fe^3＋,Cu^2＋ is obtained when sodium fluoride and thiourea is used as mixed masking agent. The method has been applied to the determination of nickel（Ⅱ） in environmental water sample with RSD of 2. 4%-3.7% and recovery of 95.5%-103.5%.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2007年第6期76-77,共2页
Metallurgical Analysis
关键词
对硝基重氮氨基偶氮苯
分光光度法
镍
环境水样
p-nitrodiazoaminoazabenzene
spectrophotometry
nickel
environmental water sample
