实验室检验2024，Vol.2Issue(5) ：10-13.

环境空气PM2.5中铵离子含量的两种检测方法比较

Comparison of two detection methods for ammonium ions content in ambient air PM2.5

曹静 于浩 王国强 郗德凤
实验室检验2024，Vol.2Issue(5) ：10-13.
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环境空气PM2.5中铵离子含量的两种检测方法比较

Comparison of two detection methods for ammonium ions content in ambient air PM2.5

曹静 1于浩 1王国强 1郗德凤2
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作者信息

  • 1. 德州市疾病预防控制中心,德州 253016
  • 2. 泰安市疾病预防控制中心,泰安 271000
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摘要

目的 比较离子色谱法与流动注射分析法测定环境空气PM2.5 中铵离子含量.方法 采集环境空气颗粒物PM2.5 的石英滤膜,各取 1/4 剪碎后经超纯水超声提取,离心过滤,分别用流动注射法和离子色谱法测定PM2.5中铵离子的含量.结果 离子色谱法测定NH4+在 0.5～10.0 mg/L范围内拟合曲线为y=0.0710+0.2214x-0.0058x2,r=0.9997,检出限0.017 μg/m3,定量限0.068 μg/m3,回收率91.0%～96.6%,RSD 0.05%～0.08%(n=6);流动注射法测定NH4+在0.02～1.00 mg/L范围内线性关系良好,y=22.576x+0.1333,r=0.9999,检出限0.003 μg/m3,定量限0.012 μg/m3,加标回收率为 105%～114%,RSD在 0.54%～2.06%(n=6)之间.利用两种方法同时测定 16 份滤膜样本,测定结果差异无统计学意义(t=1.080,P>0.05).结论 两种方法均具有良好的线性关系、精密度及准确度,流动注射分析法与离子色谱法相比有检出限低,检测时间短等优势.

Abstract

Objective Comparison of two methods for determining ammonium ion content in ambient air PM2.5.Methods 1/4 of the quartz filter membrane used to collect ambient air particles PM2.5 was cut into pieces,and ultrasound extracted by ultra-pure water,then centrifuged and filtered,and last the content of ammonium ion in PM2.5 was respectively determined by flow injection method and ion chromatography.Result The fitting curve of NH4+measured by ion chromatography in the range of 0.5～10.0 mg/L is y=0.0710+0.2214x-0.0058x2,r=0.9997.The detection limit of NH4+in PM2.5 is calculated to be 0.017 μg/m3,with a quantification limit of 0.068 μg/m3,the recovery rate is between 91.0%～96.6%,and the RSD is 0.05%～0.08%(n=6).The linear relationship of ammonium ion concentration measured by flow injection analysis in the range of 0.02～1.00 mg/L is good,with y=22.576x+0.1333,r=0.9999.The detection limit is 0.003 μg/m3,and the quantification limit is 0.012 μg/m3 with the recovery rate of 105%～114%and the RSD between 0.54%～2.06%(n=6).Using the two methods to measure 16 filter membrane samples,there was no statistically significant difference in the measurement results(t=1.080,P>0.05).Conclusion Both of the two methods have a good linear relationship,with good precision and accuracy.Compared with ion chromatography,flow injection analysis has the advantages of lower detection limit and shorter detection time.

关键词

铵离子/PM2.5/流动注射分析/离子色谱

Key words

ammonium ion/PM2.5/flow injection analysis/ion chromatography

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出版年

2024
实验室检验
中国检验检测学会

实验室检验

ISSN：2097-261X
参考文献量14
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