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利用V(v)在6.5-7.0MHCl介质中氧化二苯硫腙的褪色反应,以萃取平衡控制反应时间和水相中二苯硫腙的浓度,建立了非催化法测定V(v)的新方法,反应速度的检测,是在620nm下测定反应前后四氯化碳相中二苯硫腙吸光度的变化而进行的,方法的灵敏度为1.0×10~(-7)g·ml~(-1)V(v),线性范围为:1.0-10.3μgV(v)/10ml,对干扰严重的Cu~(2+)、Cu~+、Ag~+、Au~(3+)等可在pH3-7条件下,用二苯硫腙的四氯化碳溶液萃取除去,该方法用于测定了金属铝中的痕量钒,方法的精密度用变动系数表示为:4.2%,所得结果用钽试剂比色法进行了比较,证明方法可靠.
The fade reaction of dithiophenone oxidized by V (v) in 6.5-7.0M HCl was studied. The reaction time and the concentration of dithizone in the aqueous phase were controlled by extraction equilibrium. A new non-catalytic method for the determination of V (v) The method and the reaction speed were determined by measuring the absorbance of dithizone before and after the reaction at 620 nm. The sensitivity of the method was 1.0 × 10 -7 g · ml -1 ) V (v), the linear range is 1.0-10.3μgV (v) / 10ml. For the Cu 2+, Cu +, Ag +, Au ~ 7 conditions, with diphenylhydrazone carbon tetrachloride solution extraction and removal of the method for the determination of trace aluminum in aluminum, the precision of the method with a coefficient of variation expressed as: 4.2%, the results obtained with tantalum reagent Colorimetric method was compared to prove that the method is reliable.