摘要
废水中的无机态氮和有机态氮被过硫酸钾氧化消解后转变为硝酸盐,在硫酸和磷酸混合酸介质中,硝酸盐与2,6-二甲酚反应生成4-硝基-2,6-二甲酚而显色。废水中的总氮在2～8mg/L范围内与337nm波长处的吸光度成正比,回归方程为A=0.1672X-0.0077,相关系数r=0.9996,回收率为96.5％～105.7％。氯离子浓度高于1.5g/L时有干扰,其它常见的阴、阳离子无干扰。
Inorganically and organically bonded nitrogen in waste water is oxidized to nitrate by digestion with potassium per-oxydisulphate. The nitrate ions react with 2,6- dimethylphenol in a solution of sulphuric and phosphoric acids to form a stable complex that is 4-nitro-2,6-dimethylphenol. Beer's law is obeyed in the concentration range of 2 ~8 mg/L at 337 nm. The linear regression e-quation is A = 0. 167 2X - 0. 007 7 , with a correlation coefficient of 0. 999 6. The recovery is 96. 5% -105. 7% . The method was applied to the determination of waste water, raw water, surface water and drinking water with statisfactory result.
出处
《化学分析计量》
CAS
2003年第6期20-21,共2页
Chemical Analysis And Meterage
关键词
2
6-二甲酚
分光光度法
测定
废水监测
总氮
total nitrogen, 2 ,6-dimethylphenol, waste water, spertrophotometry, determination
