CAJ | 학술논문

待测水样中若残留过硫酸盐会对COD的测定产生干扰。考察了K2S2O8对COD测定的干扰情况，分析干扰原因，并提出相应的消除干扰措施。研究表明，残留的K2S2O8具有一定的还原性从而使COD测定值高于实际值，其浓度与COD之间呈现显著的线性关系，1 mg K2S2O8对COD变化值的贡献约为0.02979 mg。在COD标准溶液体系中，ΔCOD1（COD测定值与原水实际COD的差值）和线性方程计算的ΔCOD2（K2S2O8对COD的贡献值）的差值为原水实际COD的0.88%~1.99%；在经生化处理后的垃圾渗滤液体系中，ΔCOD1与ΔCOD2的差值为原水实际COD的1.23%~7.18%。该线性方程较好地反映了实际水样的COD，借此可消除残留K2S2O8对COD测定的干扰。
대측수양중약잔류과류산염회대COD적측정산생간우。고찰료K2S2O8대COD측정적간우정황，분석간우원인，병제출상응적소제간우조시。연구표명，잔류적K2S2O8구유일정적환원성종이사COD측정치고우실제치，기농도여COD지간정현현저적선성관계，1 mg K2S2O8대COD변화치적공헌약위0.02979 mg。재COD표준용액체계중，ΔCOD1（COD측정치여원수실제COD적차치）화선성방정계산적ΔCOD2（K2S2O8대COD적공헌치）적차치위원수실제COD적0.88%~1.99%；재경생화처리후적랄급삼려액체계중，ΔCOD1여ΔCOD2적차치위원수실제COD적1.23%~7.18%。해선성방정교호지반영료실제수양적COD，차차가소제잔류K2S2O8대COD측정적간우。
Interference occurs in the process of COD determination ,if there is residual persulfate in the water sam-ple to be tested. The interference effect caused by K2S2O8 on COD determination has been investigated,the causes of interference analyzed, and the measure to eliminate the corresponding interference proposed. The research results show that the residual K2S2O8 has certain reducibility, so as to make the COD testing value be higher than actual value. The relationship between its concentration and COD is obviously linear. The contribution of COD change val-ue by l mg of K2S2O8 is about 0.029 79 mg. In COD standard solution system,ΔCOD1 which is the difference value between COD measured value and raw water actual COD and linear equation calculated ΔCOD2 which is con-tribution value of COD by K2S2O8 is 0.88%-1.99% of raw water actual COD. In bio-chemically treated landfill leachate system, the difference value betweenΔCOD1 andΔCOD2 is 1.23%-7.18%of raw water actual COD. The linear equation can reflect the COD state of actual water sample better , and is thus able to eliminate the interference caused by the residual K2S2O8 in COD determination.