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一般矿石、岩石、纯金属、海水、空气及污水中测定铊的方法已有报导,但钢铁、高温合金中分析痕量铊的文献尚少。本文提出在1M乙酸铵-0.3%无水亚硫酸钠(pH8—9)的底液中以方波极谱阳极溶出法测定铊(Ⅰ)。该法比单用方波极谱法的灵敏度提高1个数量级。溶出峰电位约-0.35伏(银汞膜电极,下同)。在实验条件下,3.5×10~(-1)—7.0×10~(-7)M浓度与溶出峰电流呈良好的线性关系。从6N盐酸中,用异丙醚萃取铊与基体元素分离,再用氢溴酸洗去钼等干扰离
Methods for the determination of thallium in general ores, rocks, pure metals, seawater, air and sewage have been reported, but there is little literature on the analysis of trace amounts of thallium in steels and superalloys. This paper proposes the determination of thallium (I) by the square wave polarographic anodic dissolution method in the bottom solution of 1 M ammonium acetate-0.3% anhydrous sodium sulfite (pH 8-9). The method is only one order of magnitude more sensitive than the square wave polarography alone. Dissolution peak potential of about -0.35 volts (silver amalgam electrode, the same below). Under the experimental conditions, the concentration of 3.5 × 10 -1 -7.0 × 10 -7 M showed a good linear relationship with the peak current. From 6N hydrochloric acid, the extraction of thallium with isopropyl ether and the separation of matrix elements, and then washed with hydrobromic acid to remove interference such as molybdenum