计时吸附电位分析法测定KH_2PO_4中超痕量Fe(III)(英文)

DERERMINATION OF ULTRATRACE IRON IN POTASSIUM DIHYDROGEN PHOSPHATE BY DERIVATIVE ADSORPTION CHRONOPOTENTIOMETRY

利用Fe(III)和 2 (5′ 溴 2′ 吡啶偶氮 ) 5 二乙基氨基苯酚反应形成配位化合物为基础 ,研究一种灵敏的计时吸附电位法测定KH2 PO4 中超痕量Fe(III)含量。讨论了KH2 PO4 对Fe(III)与 2 (5′ 溴 2′ 吡啶偶氮 ) 5 二乙基氨基苯酚反应的影响。在电化学检测前利用PbS生成Fe2 S3共沉淀 ,将Fe(III)从KH2 PO4 溶液中分离出来。该方法用于测定了KH2 PO4 晶体和饱和溶液中超痕量Fe(III)含量 。

A sensitive derivative adsorption chronopotentiometry methodfor the determination of ultratrace Fe(III) in KH 2PO 4 has been studied based on the formation of the complex Fe(III) with 2 (5′ bromo 2′ pyridylaze) 5 diethy lanminophenol (5 Br PADAP).The influence of KH 2PO 4 on the signal of the reduction of the complex Fe(III) with 5 Br PADAP was discussed. Fe(III) was separated from the solution containing KH 2PO 4 by using the coprecipitation of Fe 2S 3 with PbS prior to electrochemical detection.The method was used for determination of ultratrace Fe(III) in KH 2PO 4 crystals and its saturated liquor with satisfactory results.