GPMAS测定土壤中亚硝酸盐氮的干扰探讨
Discussion on Interference of Soil Nitrite Nitrogen Determination by GPMAS
杨登 1陈英 1贺小敏 2王卉 3廖华英3
作者信息
- 1. 湖北省生态环境厅恩施州生态环境监测中心,湖北 恩施 445000
- 2. 湖北省生态环境监测中心站,湖北 武汉 430071
- 3. 恩施市环境监测站,湖北 恩施 445000
- 折叠
摘要
文章探讨了气相分子吸收光谱法测定土壤中亚硝酸盐氮时,硫化物、甲醛、VOCs、乙草胺、丙烯酰胺、尿素等土壤中存在的物质对分析可能产生的干扰及干扰去除方法.实验结果表明,硫化物、VOCs对亚硝酸盐氮的测定结果产生正干扰.土壤提取液中加入乙酸锌+乙酸钠混合溶液并将溶液调为弱碱性(pH 10～11),可消除硫化物干扰;土壤提取液加热煮沸3～5 min,可消除VOCs的干扰.甲醛、乙草胺、丙烯酰胺、尿素基本无干扰.
Abstract
The paper discussed the possible interference and removal methods of sulfide,formaldehyde,VOCs,acetochlor,acrylamide,urea and other substances in the determination of nitrite nitrogen in soil using gas phase molecular absorption spectroscopy.The experimental results show that sulfide and VOCs have a positive interference on the determination of nitrite nitrogen.When a mixed solution of zinc acetate and sodium acetate is added to the soil extraction solution and the solution is ad-justed to weak alkalinity(pH 10～11),sulfide interference can be eliminated.Heating and boiling the soil extract for 3～5 min-utes can eliminate the interference of VOCs.Formaldehyde,acetochlor,acrylamide,and urea have basically no interference.
关键词
气相分子吸收光谱法/土壤/亚硝酸盐氮/干扰/消除Key words
gas phase molecular absorption spectroscopy/soil/nitrogen/interference/elimination引用本文复制引用
基金项目
湖北省地方标准制修订项目(T-Z-06-2021276)
出版年
2024
NETL
NSTL
万方数据