Chemical Characteristics of Water-soluble Ions in Particulate Matter in Three Metropolitan Areas in the North China Plain

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2014 Dec 2

PMID 25437210

Citations 5

Authors

Xu Dao

Zhen Wang

Yibing Lv

Enjiang Teng

Linlin Zhang

Chao Wang

Affiliations

Soon will be listed here.

Abstract

PM2.5 and PM10 samples were collected simultaneously in each season in Beijing, Tianjin and Shijiazhuang to identify the characteristics of water-soluble ion compositions in the North China Plain. The water-soluble ions displayed significant seasonal variation. The dominant ions were NO3(-), SO4(2-), NH4(+) and Cl(-), accounting for more than 90% and 86% to the mass of total water-soluble ions in PM2.5 and PM10, respectively. The anion/cation ratio indicated that the ion acidity of each city varied both between sites and seasonally. Over 50% of the ion species were enriched in small particles ≤1 µm in diameter. The [NO3(-)]/[SO4(2-)] ratio indicated that vehicles accounted for the majority of the particulate pollution in Beijing. Shijiazhuang, a city highly reliant on coal combustion, had a higher SO4(2-) concentration.

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