稀土废水中COD_(OH.KI)与COD_(Cr)的相关性研究

Study on Correlation Between COD_(OH.KI) and COD_(Cr) in Rare-Earth Wastewater

经过对赣南22家稀土公司总排口和车间排口废水的多组水样测定,所测数据用SPSS软件进行数据统计分析,Excel软件进行模型拟合与验证,研究碘化钾碱性高锰酸钾法与重铬酸钾法测得稀土废水中化学需氧量的相关性。结果表明,碘化钾碱性高锰酸钾测定法的CODOH.KI与重铬酸钾法的CODCr线性效果非常明显,建立CODCr与CODOH.KI的数学方程CODCr=4.884 3 CODOH.KI,其CODOH.KI检测范围为0.2-5 000 mg/L。经系数检验和作图验证,该方程在实践中有着较好应用价值和指导作用。

The correlation between the results of chemical oxygen demand（ COD） in rare-earth wastewater determined with potassium iodide-alkaline potassium permanganate method and that determined with potassium dichromate method was studied by conducting statistic analysis with SPSS software and model fitting and verification with Excel software of the data obtained of more than 150 water samples taken at the overall wastewater outlets and workshop wastewater outfalls of 22 rare earth companies in Gannan. The results have shown that the linear correlation between CODOH. KIdetermined with potassium iodide-alkaline potassium permanganate method and CODCrdetermined with potassium dichromate method is conspicuous. A mathematical equation,i. e. CODCr= 4. 884 3CODOH. KI,is obtained,in which the detection range of CODOH. KIis 0. 2 to 5 000 mg / L. Coefficient test and plotting have proven that this equation has good application value and direction role in practice.