【摘要】 研究了铅-钼-偶氮胂Ⅲ异金属双核三元络合物体系的光度分析性质,建立了测定微量铅的最佳条件。络合物的最大吸收峰位于660nm（对试剂空白）,在pH2.5～4.5有恒定的吸光值。三元体系较其二元体系（无钼存在时）有较高的灵敏度与选择性。表观摩尔吸光系数ε_660nm=3.0×10⁴,0～50μg Pb/25ml遵守比耳定律。在有钼酸铵及EDTA-Zn溶液存在下,大多数金属离子均不干扰微量铅的测定。方法用于锌及锌铝合金中微量铅的直接测定,获得了满意的结果。更多还原

【Abstract】 The photometric properties of the ternary system of lead-Molyhdenum-Arsenazo Ⅲ are studied and th optimum conditions for determination of lead is established. The maximum absorption of the complex is at 660nm against reagent blank. The suitable acidity for the complex reaction is between pH 2.5～4.5.This reaction system has a higher sensitivity and selectivity than the binary system (without molybde ate). The apparent molar absorption coefficient, is 3.0×10~4; Beer’s law is obeyed in the range of 0～50μg Pb/25ml. The effect of co-existing elements on the determination of lead has been studied. The method has been used for direct determination of micro amounts of lead in Zine and Zine-aluminium allys with satisfactory results.更多还原