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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。在草酸—二苯胍底液中,Sn~(2+)于-0.59伏(对SCE)处产生一个灵敏、清晰、稳定的导数波,温度系
In this paper, inspired by the previous work, in order to solve the determination of tin in polymetallic mineral rocks, the experiment found that the addition of diphenylguanidine, CTMAB and other quaternary ammonium salts in oxalic acid base solution can greatly increase the sensitivity of determination of tin. Compared with oxalic acid-methylene blue and oxalic acid-neutral red liquid, it has similar sensitivity and selectivity. Compared with sulfuric acid-sodium chloride bottom liquid, the sensitivity is increased about 5 times. In the oxalic acid-diphenylguanidine matrix solution, Sn 2+ produces a sensitive, clear and stable derivative wave at -0.59 V (vs. SCE) with a temperature of