热矿水中高锰酸盐指数测定方法建立与优化研究OA

In view of the characteristics of high mineralization,coexistence of natural organic matter and reductive inorganic matter,and temperature fluctuation of thermal mineral water,the traditional titration method had problems such as blurred end-point color,interference from complex components,and volatilization loss at high temperatures or incomplete reaction at low temperatures.To address these issues,a new method for detecting water permanganate index(expressed as O2)based on continuous flow injection-acidic permanganate spectrophotometry was established by combining the advantages of the acidic permanganate titration method and spectrophotometry.Taking thermal mineral water as the reference sample,the experimental conditions including carrier matrix,acidic system ratio,peak time and degassing time were optimized,and the method was compared with the national standard method.The results showed that the standard curve had good linearity with a correlation coefficient higher than 0.999 5,and the detection limit was 0.02 mg/L;the relative error of accuracy was 0.3％,the relative standard deviation of precision was 0.9％,and the interferences from Fe2+,Cl-,S2-and other substances were effectively eliminated.Compared with the permanganate titration method,the reagent consumption,reagent preparation time,waste liquid output and result detection time were reduced by 93％,88％,89％,and 88％,respectively.The research results can serve the scientific management of thermal mineral water resources and provide a technical model for the detection of high-turbidity and high-organic-matter water bodies.