催化-分光光度法测定粉煤灰中痕量镍(Ⅱ)  

Determination of Trace Nickel(Ⅱ)in Fly Ash by Catalytic Spectrophotometry

作　　者：罗道成[1] 易平贵[1] 刘俊峰[1] 李佳秋[1] 

机构地区：[1]湘潭工学院化学工程系,湘潭411201

出　　处：《分析化学》2002年第8期987-989,共3页Chinese Journal of Analytical Chemistry

摘　　要：在pH 5 .0的醋酸 醋酸钠缓冲体系中 ,痕量镍 (Ⅱ )对过氧化氢氧化水杨醛肟 (SAO)的显色反应具有催化作用 ,显色程度与Ni(Ⅱ )量在一定范围内呈线性关系。借此建立了一种测定痕量Ni(Ⅱ )的催化光度法。结果表明 :有色溶液的最大吸收波长为 410nm ;方法检出限为 1.6× 10 - 8g/L ;线性范围为 0 .0～ 0 .0 2 5mg/L。本法结合 2 羟基 4 仲辛氧基二苯甲酮肟萃取分离 ,已用于粉煤灰中痕量镍的测定 。In a buffer solution of HAc NaAc(pH 5.0), the trace Ni? catalyzes the oxidation reaction of salicylaldoxime(SAO) by H 2O 2. Based on this, a spectrophotometric method for the determination of trace Ni? has been developed. The results show that the maximum absorption wavelength of the colored solution is at 410 nm, the detection limit of the method is 1.6×10 -8 g/L and the linear range of Ni? is 0.0～0.025 mg/L. Combined with the extraction separation with solvent of N530 coal oil sulfonated, the method has been applied to the determination of trace Ni in fly ash with satisfactory results.

关 键 词：水杨醛肟 痕量分析 催化-分光光度法 测定 粉煤灰 镍(Ⅱ) 

分 类 号：O657.3[理学—分析化学]