Determination of trace molybdenum by extraction catalytic kinetic spectrophotometry

被引：0

作者：

Zhu, QR ^{[1
]}

Sun, DM ^{[1
]}

Li, HY ^{[1
]}

机构：

[1] Huaibei Coal Normal Coll, Dept Chem, Huaibei 235000, Peoples R China

来源：

SPECTROSCOPY AND SPECTRAL ANALYSIS | 2002年 / 22卷 / 01期

关键词：

extraction; catalytic spectrophotometry; o-aminophenol; molybdenum;

D O I：

暂无

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

A new extraction catalytic kinetic spectrophotometric method for the determination of trace molybdenum is studied. The method is based on the molybdenum (VI) catalytic oxidation of o-aminophenol by hydrogen peroxide in week acidic medium at pH 5.5. The reaction is carried out at room temperature. The reaction time, concentration of o-aminophenol in aqueous phase and degree of reaction are controlled by extraction equilibrium. The absorbance of organic phase is measured at 424 nm. Under the optimum experiment conditions, the linear range of the determination is 0.005 0-2.0 mg . L-1, the detection limit is 2.0 x 10(-6) g . L-1 Combining with separation of ionic exchange, the method has been applied to the determination of trace molybdenum in bean samples with satisfactory results. The kinetic equation of extraction catalytic reaction is discussed.

引用

页码：107 / 109

页数：3