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用伏安法或石墨电极阳极氧化伏安法测定痕量铂虽有报道,但其灵敏度均不够高。Ghulkina等发现在HCl介质中含Sn(Ⅳ)或Sn(Ⅱ),以Pt-Sn共沉淀在碳糊电极上,使铂的测定限达5×10-9g/L。本文用0.3mol/LH_2SO_4-Hg(Ⅱ)-3.0×10~(14)mol/L KMnO_4体系测Pt,其检测限为0.5μg/L。探讨了利用黄原酸钠纤维素酯(CCX)分离除去试液中Au~(3+)Pd~(2+)等干扰元素。本法已用于实际样品分析,结果较好。
The determination of trace platinum by voltammetry or graphite anodic voltammetry has been reported, but its sensitivity is not high enough. Ghulkina et al. Found that Sn (IV) or Sn (II) was contained in the HCl medium and co-precipitated with Pt-Sn on the carbon paste electrode to limit the determination of platinum to 5x10-9g / L. In this paper, the detection limit of Pt was 0.5μg / L with 0.3mol / LH_2SO_4-Hg (Ⅱ) -3.0 × 10 ~ (14) mol / L KMnO_4 system. The interference element such as Au ~ (3 +) Pd ~ (2+) in test solution was separated and separated by using sodium xanthate cellulose ester (CCX). This method has been used in the actual sample analysis, the result is better.