Rao C K, Babaiah O, Reddy V K, Reddy T S
Department of Chemistry, Sri Krishnadevaraya University, Anantapur 515 003, India.
Talanta. 1992 Oct;39(10):1383-5. doi: 10.1016/0039-9140(92)80254-b.
A sensitive spectrophotometric method is developed for the determination of manganese in aqueous medium. The metal ion forms a yellowish brown coloured complex with resacetophenone oxime (RPO) in ammonium chloride and ammonium hydroxide buffer of pH 10.5. The 1:1 complex shows maximum absorbance at 380 nm with a Beer's law range of 0.09-1.7 ppm. The molar absorptivity and the Sandell sensitivity are found as 2.5 x 10(4) l.mole(-1).cm(-1) and 0.002 mug/cm(2), respectively. The stability constant of the complex calculated by Job's method is 7.5 x 10(5). The interfering effects of various cations and anions are studied. The present method is applied to the determination of manganese in some steel and alloy samples.
开发了一种灵敏的分光光度法用于测定水介质中的锰。在pH 10.5的氯化铵和氢氧化铵缓冲溶液中，金属离子与间苯乙酮肟（RPO）形成黄褐色络合物。该1:1络合物在380 nm处显示最大吸光度，符合比尔定律的范围为0.09 - 1.7 ppm。摩尔吸光系数和桑德尔灵敏度分别为2.5×10⁴ l·mol⁻¹·cm⁻¹和0.002 μg/cm²。用乔布法计算的络合物稳定常数为7.5×10⁵。研究了各种阳离子和阴离子的干扰效应。本方法应用于一些钢铁和合金样品中锰的测定。
