测定水中总氮时高空白吸光度的原因查找
收稿日期: 2004-05-16
网络出版日期: 2010-10-01
Fault analysis of the high absorbance of blank tests in the determination of the total nitrogen content in water
Received date: 2004-05-16
Online published: 2010-10-01
曹蕾, 何云飞 . 测定水中总氮时高空白吸光度的原因查找[J]. 工业水处理, 2005 , 25(1) : 54 -55 . DOI: 10.11894/1005-829x.2005.25(1).54
According to GB 11894-1989, when the concentration of the total nitrogen in surface water is determined, the absorbance of the blank test is rather high. During the tests, the factors, such as the purity of oxidant, the deposited time of oxidation solution, the stability of experimental apparatus, the purity of distilled water, experi-mental environment, etc. bring negative influences on the experimental results. Through a series of contrast tests, the water in the tests, reagent, vessels, autoclave and ultraviolet visible spectrophotometry which have influences on the tests have been examined systematically one by one. The main causes for problems have been found out and adjustments have been made.
Key words: total nitrogen; blank test; absorbance
[1] GB 11894-1989,水质总氮的测定碱性过硫酸钾消解紫外分光光度法[S].
[2] 徐晓春,黄小红,夏羽兰,等.降低总氮测定空白的方法改进[J].甘肃环境研究与监测,2003,16(1):44.
[3] 邵亚凤,过美蓉.测定总氮时影响空白吸光值的因素[J].环境污染与防治,2001,23(6):304.
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