高氯离子废水化学需氧量分析方法的研究

提出一种测定高氯离子废水 COD的新方法。其消解条件与现行国标法基本相同 ,消解过程产生的氯气用Na OH吸收并测定出氯离子的 COD校正值。由表观 COD值减去氯离子的 COD校正值 ,即为水样的真实 COD值。标样的相对误差在 -1.5 %～ 5 %之间 ,RSD%≤ 5 .5 %。高氯废水的 RSD%≤ 8.0 %。

Analytical method of chemical oxygen demand in wastewater containing high chloride

A method was developed to eliminate chlorine interferences while analyzing COD i n wastewater The digestion conditions of the method were same as the national standard method The free chlorine produced in digestion procession was purged and absorbed into NaOH solutions The absorbed chlorine was analyzed to determi ne the chlorine compensated value The COD value was obtained by deducting the chlorine compensated value from apparent COD The relatively error of standards ranged from -1 5% to 5% with relatively standard deviation below 5 5% The analytical results of waster containing high chlorid showed that relatively stan dard deviation below 8 0%