无汞盐化学需氧量测定方法研究

本法基于可定量测定K_2Cr_2O_7和Cl~-的反应产物C~2这一原理,在用吸收装置吸收Cl_2后,用碘量法测定余氯。试验结果表明,本法有较高的准确度和精密度。

Determination of Chemical Oxygen Demand without Using Mercury Salts

This method is based on the principle that potassium dichomate and chlorine (Cl2) can be quantitatively determined. An absorber was used to absorb Cl2 that was the product of what dichromate oxidated. Then iodimctry was used to determined the residual chlorine, of which the equivalent numbers were subtracted from the equivalent numbers of the dichromate consumed. Thus the interference of chloride was eliminated. The result showed that the method was of higher accuracy and precision and reproducibility of results covered a wide range of chloride concentrations.