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众所周知,铱的原子吸收光谱法灵敏度较低。就显色反应来看,到目前为止,铂族元素中有关铱的显色反应研究最少,其中高灵敏度的显色反应更少。我们发现在一定条件和光线照射下,4,4′-二(二乙氨基)一二苯硫酮(BDPTK)与铱(Ⅳ)可以产生灵敏度极高的显色反应,其摩尔吸光系数高达2.3×10~8(?)·mol~(-1)·cm~(-1),乃文献中所罕见。本文系统地研究结果表明该反应选择性也较好,有可能用于测定铂和铑中的痕量铱。
As we all know, iridium atomic absorption spectrometry less sensitive. As far as the color reaction is concerned, up to now, there have been at least a few studies on the chromogenic reaction of platinum group elements related to iridium, of which the high-sensitivity color reaction is less. We found that under certain conditions and light irradiation, 4,4’-bis (diethylamino) diphenylthione (BDPTK) and iridium (IV) can produce highly sensitive color reaction, the molar absorption coefficient of up to 2.3 × 10 ~ 8 (?) · Mol ~ (-1) · cm ~ (-1), which is rare in the literature. This article systematically studies the results show that the reaction selectivity is also better, it is possible for the determination of trace amounts of iridium in platinum and rhodium.