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多价阳离子与NO_3~-或NO_2~-作用产生的灵敏的催化电流可用于微量金属离子或NO_3~-,NO_2~-的极谱测定,但对产生催化电流的机理并不十分清楚,本文讨论了Yb~(3+)-NO_3~-(或NO_2~-)-NH_4Cl体系,证明有两种不同性质的电流同时存在.当[Yb~(3+)]远小于[NO_3~-]或[NO_2~-]时,以平行催化电流为主;而当[Yb~(3+)]远大于[NO_3~-]或[NO_2~-]时则以NO_3~-或NO_2~-的催化电还原电流为主要成分. 本文改进了原来提出的一些实验条件,使镱在直流极谱上的测定下限达5×10~(-8)M.
The sensitive catalytic current generated by multivalent cations and NO_3 ~ - or NO_2 ~ - can be used for the determination of trace metal ions or NO_3 ~ -, NO_2 ~ - but the mechanism of generating catalytic current is not very clear. Yb ~ (3 +) - NO_3 ~ - (or NO_2 ~ -) - NH_4Cl system shows that there are two kinds of currents with different properties at the same time.When Yb ~ (3 +) is much smaller than [NO_3 ~ -] NO_2 ~ -], the parallel catalytic current was the main factor. When [Yb ~ (3 +)] was much larger than [NO_3 ~ -] or [NO_2 ~ -], NO_3 ~ - or NO_2 ~ Current as the main component.This paper improves some of the original experimental conditions proposed, so that ytterbium in DC polarographic determination limit of 5 × 10 ~ (-8) M.