摘要
研究了间苯二酚法在线测定总氮含量时存在的问题,发现消解池中会产生红黑色杂质,使测量结果偏大。通过分析反应原理及可能存在的副反应,推断间苯二酚与Fe3+的络合反应是红黑色杂质的主要来源,并进行了实验验证,建议采用纯度更高的硫酸并定期拆洗消解池以改善红黑杂质干扰问题。
Existing issues in the online determination of total nitrogen content in water by a nonstandardized resorcinol method were studied.It has found that reddish black impurities could be created in the digestion pool so as to cause a bit higher measuring results.Through an analysis on the reaction principles and any possible secondary reactions,the primary source of the reddish black impurities was inferred to be a complex reaction between resorcinol and Fe(Ⅲ)that has been verifi ed by conducting experiments.To eliminate the interference,it is suggested to use more purified sulphuric acid whilst regularly demounting and cleaning the digestion pool.
作者
杨雅楠
沈兆雷
Yang Yanan;Shen Zhaolei(Tianjin Shareshine Technology Development Co.,Ltd.,Tianjin 300384;Tianjin Fuqin Science&Technology Co.,Ltd.,Tianjin 300456)
出处
《上海环境科学》
2023年第5期211-214,共4页
Shanghai Environmental Sciences
关键词
总氮检测
间苯二酚
红黑色杂质
Determination of total nitrogen
Resorcinol
Reddish black impurity
