Abstract：The influence of total ionic strength adjustment buffer addition on the determination of F- in solubility phase diagram of zinc hydrometallurgy system by fluorine ion selective electrode-standard curve method and standard addition method was systemically investigated. The research results showed that: (1) as a whole, the measurement results of fluorine ion selective electrode-standard addition method were much better than those obtained by standard curve method regardless of addition amount of total ionic strength adjustment buffer; (2) in fluorine ion selective electrode-standard addition method, the determination results were greatly affected by the addition amount of total ionic strength adjustment buffer; (3) when the background ion concentration in testing solution was very low, the addition of total ionic strength adjustment buffer had negative effect on the accuracy of analytical results. In other words, the results were better without addition of total ionic strength adjustment buffer; (4) when the background ion concentration in testing solution was relatively high, the addition of total ionic strength adjustment buffer was advantageous the improvement of determination precision. The experimental results were applied for the determination of F- in solution of zinc hydrometallurgy. The lowest error was 0.93%.
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