碘化钾碱性高锰酸钾法测定化学需氧量有关问题的释疑  

Potassium Iodide-Potassium Permanganate Method Used to Determine Chemical Oxygen Demand

作　　者：张士权 李英芹 范俊欣 

机构地区：[1]中国石油环境监测总站

出　　处：《油气田环境保护》2005年第2期45-47,共3页Environmental Protection of Oil & Gas Fields

摘　　要：最常见的化学需氧量(COD)的测定方法是铬酸钾法和高锰酸钾法。但用上述两种方法测定废水中COD时易受到氯离子的干扰。为此,提出了用“碘化钾碱性高锰酸钾法”消除氯离子干扰的机理。对碘化钾高锰酸钾法验证的结果表明,该方法适用于测定油气田和炼化企业高氯、低氯废水的COD。求出用碘化钾高锰酸钾法与铬酸钾法测定的COD比值,可将碘化钾碱性高锰酸钾测定法的CODOH.KI换算成铬酸钾法的CODCr值来衡量水体的有机物污染情况及判断废水是否达到排放标准。The common methods for determining chemical oxygen demand (COD) contain potassium chromate and potassium permanganate. Those methods have some disadvantage such as chlorion disturbance. A new method for removing chlorion disturbance named potassium iodide-potassium permanganate is proposed. The test shows that this method is suitable for measuring COD of high-chlorinate and low-chlorinate wastewater produced from oil-gas fields and refineries. The ratio of COD from potassium iodide-potassium permanganate to that from potassium chromate can be used to identify pollutants in wastewater and realize wastewater emission standard.

关 键 词：碘化钾 高锰酸钾 化学需氧量 测定方法 化学需氧量(COD) 碱性高锰酸钾法 氯离子干扰 铬酸钾法 炼化企业 排放标准 

分 类 号：X832[环境科学与工程—环境工程]