钯-结晶紫-高碘酸钾-十二烷基苯磺酸钠体系动力学光度法测定钯(Ⅱ)

Determination of Trace Palladium ( Ⅱ) by Kinetic Spectrophotometry based on Oxidation of Crystal Violet by Potassium Periodate in the Presence of Sodium Dodecyl Benzene Sulphonate

在0.01 mol/LHAc溶液中,钯(Ⅱ)可灵敏地催化高碘酸钾氧化结晶紫的褪色反应,加入十二烷基苯磺酸钠(SDBS)后,体系的最大吸收波长由.585nm移至575 nm,催化褪色的灵敏度显著增加,吸光度与钯(Ⅱ)浓度在0～0.2 mg/L范围内呈线性关系(r=0.9990),检出限为0.006 rag/L。体系加入SDBS后高碘酸钾不仅作为氧化剂.还与结晶紫、高碘酸钾和sDBS问形成离子络合物。利用拟订的方法测定实际样品中的钯,结果满意。

A new kinetic spectrophotometric method for the determination of trace amount of palladium (Ⅰ) sensitized by sodium dedecyl bezene sulfonate (SDBS) was proposed. In 0. 01 mol/L HAc buffer solution, the oxidizing decoloration of crystal violet by potassium periodate can be sensitively catalysed by palladium ( Ⅱ ) .With adding of SDBS, the sensitivity of the catalytic indicating reaction increased largely. The absorbency and concentration has linear relationship ranging from 0-0. 2 mg/L of Pd. Detect limit is 0. 006 mg/L. The mechanism of the reaction was proposed. When SDBS was added into the solution, it could act as an oxidan, and combined with crystal violet, potassium periodate and SDBS to be a complex compound. The method was applied to the determination of Pd samples with satisfactory results.