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试验发现 ,新试剂 N-烯丙基 - N′- (对苯磺酸钠 )硫脲在氟化钠和 2 mol· L- 1 盐酸介质中与 Pd( )生成黄色配合物。在此条件下 ,能与 Pd( )共存的阳离子和阴离子在常温下均不产生沉淀或生成深色配合物。 N-烯丙基 - N′- (对苯磺酸钠 )硫脲试法是 Pd( )的一种高选择性鉴定方法。检出限为 0 .2 1 μg,最低浓度为 6.4 μg·ml- 1。该方法条件容易控制 ,操作简便 ,在对实际样品中 Pd( )的鉴定时 ,均获得满意结果。
It was found that the new reagent N-allyl-N’- (sodium p-benzenesulfonate) thiourea formed a yellow complex with Pd () in sodium fluoride and 2 mol·L -1 hydrochloric acid. Under these conditions, both cations and anions that coexist with Pd () do not precipitate or form dark complexes at room temperature. The N-allyl-N’- (sodium p -benzenesulfonate) thiourea test is a highly selective method for the determination of Pd (). The detection limit was 0.21 μg and the lowest concentration was 6.4 μg · ml-1. The method is easy to control and easy to operate. Satisfactory results have been obtained in the identification of Pd () in real samples.