CAJ | 학술논문

国家标准分析方法规定，测定COD（Cr）须进行2小时的回流加热消解。但没有明确规范加热的精确温度及具体的溶液沸腾状况。试验研究表明：过高的消解温度会使少量重铬酸钾分解，以致影响测定结果。低COD水样必须采取恒温微沸腾回流消解的手段，可以减小相应测定误差。
국가표준분석방법규정，측정COD（Cr）수진행2소시적회류가열소해。단몰유명학규범가열적정학온도급구체적용액비등상황。시험연구표명：과고적소해온도회사소량중락산갑분해，이치영향측정결과。저COD수양필수채취항온미비등회류소해적수단，가이감소상응측정오차。
In national standard analytical methods ,it is defined that 2 hours of reflux heating digestion should be carried on to measure COD (Cr). But the precise temperature and the specific boiling solution condition are not clearly defined. The experiments show that too high digesting temperature will make a little of potassium dichromate decompose which leads to the measure results deviation. The low COD sam‐ples must carry on the method of constant temperature slightly boiling reflux digestion in order to decrease the measure error.