东海PM<sub>2.5</sub>和PM<sub>10</sub>中水溶性离子的组成与化学特性

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Abstract The PM_2.5 and PM₁₀ samples were collected over the East China Sea in May and June,2014.The main water-soluble cations (Na⁺,K⁺,NH₄⁺,Mg²⁺ and Ca²⁺) and anions (Cl^-,NO₃^-,SO₄^2- and MSA) were determined by ion chromatography method,meanwhile the main sources of these ions were discussed by a series of mathematical statistics methods.The concentrations of the total water-soluble ions ranged from 7.9 to 23.7 μg/m³ in PM_2.5 and from 10.4 to 47.9 μg/m³ in PM₁₀,respectively,with the average values of (14.9±5.8)μg/m³ and (21.3±10.7)μg/m³.The results showed that the level of the secondary ions (nss-SO₄^2-,NO₃^- and NH₄⁺) were the highest,accounting for 80.8% and 73.3% of total identified ions in PM_2.5 and PM₁₀.SO₄^2- and NH₄⁺ were mainly found in the fine particles (PM_2.5),while NO₃^- mainly was found in the coarse particles (PM₁₀).Enrichment factors and correlation analysis showed that K⁺ mainly came from crust and the source of Mg²⁺ was under the double influence of crust and ocean.The calculated results of equivalent concentrations of anions and cations showed that acid and alkaline compositions were not neutralized completely with weak alkalinity in PM_2.5,while those were neutralized completely in PM₁₀.NH₄⁺ was mainly in the forms of (NH₄)₂SO₄ and NH₄NO₃ both in two particles.The analysis of sulfate source showed that contributions of biogenic sulfates to nss-SO₄^2- were 13.7% and 8.7% in PM_2.5 and PM₁₀.In addition,accounting to the calculation of dry deposition,the contribution of NH₄⁺ to the nitrogen deposition were obvious less than that of NO₃^-.

Key words： PM_2.5 PM₁₀ water-soluble ion methanesulfonic acid non-sea-salt sulfate East China Sea

Received: 07 August 2017

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	ZHOU Sheng-jie
	ZHANG Hong-hai
	YANG Gui-peng

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ZHOU Sheng-jie,ZHANG Hong-hai,YANG Gui-peng. Distributions and chemical characteristics of water soluble ions in PM_2.5 and PM₁₀ over the East China Sea[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 900-909.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/900

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