高氯钻井废水低COD分析方法改进  

Improvement of the High Chloride Drilling Wastewater with Low COD Analysis Method

作　　者：张晓刚[1] 张淑侠[1] 雷亮 何焕杰[1] 吕宁超[1] 张鑫[1] 郭民乐[1] 

机构地区：[1]中原石油勘探局钻井工程技术研究院,河南濮阳457001 [2]中原油田采油四厂油藏经营管理,河南濮阳457001

出　　处：《化学分析计量》2013年第3期20-22,共3页Chemical Analysis And Meterage

基　　金：国家科技重大专项(2011ZX05017);中原石油勘探局2010年重大科技攻关项目(2010305)

摘　　要：用重铬酸钾法测定油气田高氯低COD的钻井废水时会产生较大误差。对该国标法测定COD进行了改进,采用低浓度氧化剂,增加硫酸汞以掩蔽氯离子来降低COD的分析误差。实验结果表明,选择0.0500 mol/L的重铬酸钾溶液,硫酸汞与氯质量比为10︰1时,测定结果的相对误差小于10%,适合测定高氯低COD钻井废水的COD值。该方法扩大了国标法的适用范围。Significant error occur as COD of the high chloride drilling wastewater with low COD in the gas-oil field was determined using the K2Cr2O7 method. The method with low concentration of oxidant and increasing Hg2SO4 to masking chloride reduced COD analysis error. Experimental results show that when using 0.050 0 mol/L K2Cr2O7 solution and the mass ratio of Hg2SO4 and Cl- was l0 ： 1, the relative error of COD determination results was less than 10%. This method is suitable for determination of the high chloride drilling wastewater with low COD and expands the range of national standard method.

关 键 词：化学需氧量 钻井废水 相对误差 

分 类 号：O661[理学—分析化学]