摘要
我国现行环境空气中甲醛的标准测定方法普遍难以满足当前大气监测中对痕量浓度水平甲醛的监测需要。在乙酰丙酮分光光度法的基础上改进得到的乙酰丙酮荧光法具有更低的检出限和更高的灵敏度,适用于大气中痕量浓度水平甲醛的监测。基于乙酰丙酮荧光法设计了甲醛在线监测系统,并对其主要性能指标进行了评估测试。测试结果显示,该系统的吸收效率为98.9%~100.1%,检出限为0.045 4×10^(-9),精密度为0.44%,线性误差为-0.55%,线性范围为0.0~80.0×10^(-9),响应时间为282 s,单日零点漂移为-0.04×10^(-9)~1.33×10^(-9),单日跨度漂移为-0.90×10^(-9)~3.45×10^(-9)。测试结果表明,其各项性能指标均能满足当前对大气环境中痕量浓度水平甲醛的监测需求。
There are several standard monitoring methods for formaldehyde in China,but all these methods can not meet the needs of the trace level formaldehyde monitoring. Based on the acetylacetone spectrophotometry,the improved acetylacetone fluorescence method has lower detection limit and higher sensitivity,which is suited for the trace level formaldehyde monitoring. An on-line formaldehyde monitoring system was designed based on acetylacetone fluorescence method,and its main performance indicators were evaluated and tested. The results showed that the absorption efficiency was between 98. 9% and 100. 1%,the detection limit was 0. 045 4×10^(-9)( volume fraction,unless otherwise specified),the relative deviation of precision was 0. 44%,the linear error of accuracy was-0. 55%,the linear range was between 0. 0 and 80. 0×10^(-9),the response time was 282 s,the zero drift was between -0. 04×10^(-9) and 1. 33×10^(-9),and the span drift was between -0. 90×10^(-9) and 3. 45×10^(-9),all the above indicators can meet the needs of trace level formaldehyde monitoring.
作者
赵长民
李莉娜
简朝星
潘本锋
姜加龙
ZHAO Changmin;LI Lina;JIAN Chaoxing;PAN Benfeng;JIANG Jialong(Zhengzhou Ecology and Environment Monitoring Centre of Henan Province,Zhengzhou 450000,China;State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring,China National Environmental Monitoring Centre,Beijing 100012,China;Beijing SDL Technology Co.,Ltd.,Beijing 102200,China)
出处
《中国环境监测》
CAS
CSCD
北大核心
2021年第4期156-162,共7页
Environmental Monitoring in China
关键词
乙酰丙酮荧光法
在线监测
环境空气
甲醛
痕量
acetylacetone fluorescence method
on-line monitoring
ambient air
formaldehyde
trace amount
作者简介
第一作者:赵长民(1980-),男,河南郑州人,硕士,高级工程师;通讯作者:李莉娜。
