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铂的催化波已用于岩矿中痕量铂的测定,关于其机理的探讨亦有较详尽的报导。本文在文献的基础上,拟定了不经分离,在盐酸-甲醛-硫酸肼底液中,利用铂催化波直接测定钯中铂的方法,测定下限为1×10~(-4)%。在选定的条件下,至少允许4.6×10~5倍过量的钯共存。以本法分析光谱钯粉标样及氯化钯试样,测得铂的结果与常用的预分离主体钯,而后DDO光度法测定的结果一致,而且比后者快速简便。试样中铂的9次测定的平均值为5×10~(-4)%时,对应的单次测定的标准偏差为2.1×10~(-5)%,变异系数4.2%。
Platinum catalytic wave has been used in the determination of trace amounts of platinum in rock and mine, and its mechanism is also discussed in more detail. Based on the literature, a method was developed for the direct determination of platinum in palladium in hydrochloric acid-formaldehyde-hydrazine sulfate base without any separation. The lower limit of determination is 1 × 10 ~ (-4)%. Under the selected conditions, at least 4.6 × 10 ~ 5 times the excess palladium is allowed to coexist. Spectrophotometric analysis of palladium standard samples and palladium chloride samples, measured platinum results and the commonly used pre-separation of the main palladium, and then measured by DDO photometric results are consistent, and faster than the latter simple. When the average of 9 measurements of platinum in the sample is 5 × 10 -4%, the standard deviation of the corresponding single measurement is 2.1 × 10 -5%, and the coefficient of variation is 4.2%.