摘要
在pH 2.0的Clark-Lubs缓冲溶液中,DBC-偶氮胂与铬（Ⅲ）反应形成组成比为1∶1的紫红色络合物。该络合物的最大吸收波长位于600 nm,方法表观摩尔吸光系数6ε00 nm=1.87×10^4L.mol^-1.cm^-1,Cr（Ⅲ）浓度在0-3 mg/L范围内遵守比耳定律。本法已成功地用于白菜样品中铬的测定,分析结果与对照法原子吸收光谱法结果相符。测定铬的加标回收率为98.0%-102%,13次测定相对标准偏差为1.6%-2.5%.
In a buffer medium of Clark-Lubs at pH 2.0, DBC-arsenazo reacts with chromium（ Ⅲ ） to form a violet-red complex with a composition of 1 ： 1. The maximum absorption wavelength of the complex is 600 nm. The apparent molar absorptivity of the method is ε600 nm = 1.87 × 10^4 L.mol^-1. cm^-1. Beer＇s law is followed over the concentration range of 0- 3 mg/L of chromium（ Ⅲ ）. The method is successfully used in determining chromium in cabbage samples. The analytical results accordes with those of contrast method atomic absorption spectrometry. The recovery of standard addition of the method for the determination of chromium was 98.0 % -- 102 %. The relative standard deviation of thirteen replicate determinations was 1.6 % --2.5 %.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2008年第9期1137-1140,共4页
Acta Armamentarii
