矿物岩石中锡的催化极谱测定  

Catalytic Polarographic Determination of Tin in Rocks and Minerals

作　　者：张灿 Zhang Can

机构地区：[1]四川省地矿局中心实验室

出　　处：《岩矿测试》1986年第2期137-138,I0011,共3页Rock and Mineral Analysis

摘　　要：本文在前人工作的启发下,为了解决多金属矿物岩石中锡的测定,实验发现在草酸底液中,加入二苯胍、CTMAB等季胺盐,均可大大提高测定锡的灵敏度。与草酸—亚甲基兰、草酸—中性红底液比较,有相似的灵敏度与选择性,与硫酸—氯化钠底液比较,灵敏度提高5倍左右。A method is proposed for the direct determination of tin in rocks and minerals by 1st order derivative of oscillopolarograph model JP-2,with 0.5mol/L oxalic acid-2.5×10^(-3)mol/L diphenylguanidine solution as supporting electrolyte.It is found that Sn(Ⅳ)forms an electroactive complex with oxalic acid and diphenylguanidine.The complex produces a sensitive absorption catalytic wave with a peak at=0.59V(vs SCE).The peak height is proportional te the concentration of tin over the range O to 1.5ppm.The determination limit is 0.005ppm. the influence of 34 coexisting ions was also tested. This method is quite simple and rapid, and has been applied to the direct determination of 0.00x-10% Sn in rocks and minerals without separation. The results obtained are satifactory.

关 键 词：灵敏度提高 矿物岩石 亚甲基兰 底液 中性红 季胺盐 CTMAB 二苯胍 

分 类 号：O65[理学—分析化学]