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建立了不经分离富集,极谱法直接连测物料(矿样、矿渣及催化剂)中铂和铑的方法。在H_2SO_4-NH_4Cl-六次甲基四胺-硫酸肼体系中,铂和铑有高灵敏度及高选择性的催化极谱波,峰电位分别为-0.99V和-1.16V(vs.SCE),二阶导数峰峰电流与质量浓度在0.001~0.008μg/m L和0.0001~0.0008μg/m L范围内呈良好的线性关系(r_(Pt)=0.9994,r_(Rh)=0.9999),检出限分别为0.0002和0.00002μg/m L。物料经碱熔酸化后连测铂和铑,回收率在98%~106%之间,相对标准偏差(RSD)≤9.6%。与其它经典方法比较,分析结果基本吻合。
A method was established for the direct and indirect determination of platinum and rhodium in materials (ore samples, slag and catalyst) without separation and enrichment. In the H_2SO_4-NH_4Cl-hexamethylenetetramine-hydrazine sulfate system, platinum and rhodium have high sensitivity and selectivity for polarographic polarographic waves with peak potentials of -0.99V and -1.16V (vs.SCE), respectively. The second derivative peak current was linear with the mass concentration in the range of 0.001 ~ 0.008μg / m L and 0.0001 ~ 0.0008μg / m L (r Pt = 0.9994, r Rh = 0.9999) The limits were 0.0002 and 0.00002 μg / m L, respectively. After the material was acidified by alkali, platinum and rhodium were measured. The recovery was between 98% and 106%, and the relative standard deviation (RSD) was less than or equal to 9.6%. Compared with other classical methods, the analysis results basically agree.