东海PM2.5和PM10中水溶性离子的组成与化学特性

被引:21
作者
周胜杰 [1 ]
张洪海 [1 ,2 ]
杨桂朋 [1 ,2 ,3 ]
机构
[1] 中国海洋大学化学化工学院
[2] 中国海洋大学海洋化学理论与工程技术教育部重点实验室
[3] 青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室
基金
国家重点研发计划;
关键词
PM2.5; PM10; 水溶性离子; 甲基磺酸盐; 非海盐硫酸盐; 东海;
D O I
暂无
中图分类号
X513 [粒状污染物];
学科分类号
083001 [环境科学];
摘要
2014年5~6月在东海海域采集PM2.5和PM10气溶胶样品,通过离子色谱法对样品中主要水溶性阳离子(Na+、K+、NH4+、Mg2+、Ca2+)和阴离子(Cl-、NO3-、SO42-、MSA)的浓度进行测定,并结合相关数理统计方法探讨了其主要来源.结果表明,PM2.5和PM10样品中主要水溶性离子的总浓度范围分别为7.9~23.7μg/m3和10.4~47.9μg/m3,平均值分别为(14.9±5.8)μg/m3和(21.3±10.7)μg/m3.二次离子(nss-SO42-、NO3-和NH4+)浓度最高,分别占测定离子总浓度的80.8%和73.3%,其中SO42-和NH4+主要富集在细颗粒物(PM2.5)中,NO3-主要富集在粗颗粒物(PM10)中.富集因子及相关性分析表明K+主要来自陆源,Mg2+受海源和陆源双重输入影响.阴阳离子浓度平衡计算结果表明,细颗粒物样品呈弱碱性;粗颗粒物样品酸碱基本中和.两种样品中NH4+的主要结合方式均为(NH4)2SO4和NH4NO3.来源分析结果表明,PM2.5和PM10样品中生源硫化物对nss-SO42-的贡献率分别为13.7%和8.7%.根据估算的干沉降通量结果,NH4+对氮沉降的贡献程度小于NO3-.
引用
收藏
页码:900 / 909
页数:10
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