化探试样中微量锡钨钼的催化极谱测定  

Catalytic Polarographic Determination of Micro Amounts of Tin Tungsten and Molybdenum in Geochemical Samples

作　　者：李中植 Li Zhongzhi

机构地区：[1]西南有色金属地质研究所

出　　处：《岩矿测试》1987年第1期50-53,I0009,共5页Rock and Mineral Analysis

摘　　要：目前所发表的资料多数是二次称样分别碱熔测定锡和钨钼。本文试验了一次试样经过氧化钠熔融后用磷酸钠—铝酸盐的碱性溶液作浸取剂,制备锡、钨、钼试液,克服了钙、镁氢氧化物对锡离子的吸附。The sample was fused with sodium peroxide,a solution containing 2 mol/L sodium hydroxide,1%sodium phosphate and aluminate was used as leaching reagent,which can prevent calcium and magnesium hydroxide from adsorbing tin in alkaline medium.An acidified test solution was used to determine tin in the system of H_(2)SO_(4)-HClO_(4)-KBr-V^(+4)-Cit by second derivative catalatic pola-rography directly.Another acidified aliquot was used to determine tungsten and molybdenum in the system of sulfuric acid-mandelic acid-cincholine.The reciveries of Sn,Mo,W were over 99%.

关 键 词：碱性溶液 钨钼 锡离子 过氧化钠熔融 氢氧化物 铝酸盐 磷酸钠 微量锡 

分 类 号：O65[理学—分析化学]