大气颗粒物中硝基多环芳烃的气相色谱-化学电离负离子-质谱联用法分析

被引：13

作者：

张萌萌

王新红

闫景明

吴水平

机构：

[1] 厦门大学近海海洋环境科学国家重点实验室环境科学研究中心

来源：

环境化学 | 2010年 / 29卷 / 03期

关键词：

厦门; PM10; nitro-PAHs; 汽车尾气; 昼夜变化;

D O I：

暂无

中图分类号：

X831 [大气监测];

学科分类号：

0706 ; 070602 ;

摘要：

比较了硝基多环芳烃(nitro-PAHs)的GC-EI/MS,GC-NCI/MS和HPLC-FLD分析方法,结果表明,GC-NCI/MS法选择性和灵敏度较高,样品前处理简单,满足大气颗粒物中痕量Nitro-PAHs的分析要求.用GC-NCI/MS法分析了厦门市钟鼓山隧道、厦门大学海洋楼和环岛干线大气颗粒物PM10中6种nitro-PAHs,包括9-硝基蒽(9-NAN)、2-硝基荧蒽+3-硝基荧蒽(2+3-NF)、1-硝基芘(1-NP)、7-硝基苯并[a]蒽(7-NBaA)和6-硝基苯并[a]芘(6-NBaP).结果显示,隧道样品中nitro-PAHs的浓度最高,6种nitro-PAHs的日均总浓度在1210.0—1931.0pg.m-3之间,其次为海洋楼顶和环岛干线,分别处于100.6—900.4pg.m-3和96.5—332.1pg.m-3范围内.隧道样品中1-硝基芘(1-NP)含量占绝对优势((60.9±7.0)%),显示汽车尾气直接排放的特征;而海洋楼顶和环岛干线站点的样品以2+3-硝基荧蒽(2+3-NF)为主,分别占到nitro-PAHs总浓度的(54.9±6.7)%和(66.4±5.0)%,说明受气相反应生成的影响明显.海洋楼顶PM10中nitro-PAHs的浓度显示明显的昼夜变化规律,夜间nitro-PAHs浓度及2+3-NF/1-NP比值均明显高于白天,说明大气颗粒物中的nitro-PAHs受光降解的影响明显,夜间nitro-PAHs主要由PAHs与NO3.自由基的反应生成.

引用

页码：376 / 382

页数：7

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