南昌市土壤风沙尘PM2.5中水溶性离子分布特征及来源初探
南昌市土壤风沙尘PM2.5中水溶性离子分布特征及来源初探
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于瑞莲
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郑权;胡恭任;王珊珊;赵莉斯;于瑞莲
为了解南昌市土壤粉尘PM2.5组分特征，采用重悬浮采样器采集土壤粉尘中PM2.5样品，采用离子色谱法检测9种水溶性无机离子的含量。结果表明，总水溶性离子含量为11.126±2.703 mg/g。阴离子中SO42-含量最高（3.568±1.553mg/g），阳离子中Ca2+含量最高（1.684±0.545mg/g）。 SO42-、NO3-、Ca2+、Cl-是土壤粉尘PM2.5中主要水溶性离子，占水溶性离子总量的80.60%。与其他城市相比，南昌市土壤粉尘PM2.5中水溶性离子含量较低。阳离子与阴离子当量浓度比为1.26，表明土壤粉尘PM2.5呈弱酸性。空间插值分析显示，南昌市西南部地区水溶性离子含量较高，东部和北部大部分地区较低。相关分析表明Na+、F-、NH4+与其他离子具有同源性，而K+与其他离子无相关性。 NO3-/SO42-比值为0.26～0.97，表明固定污染源对土壤粉尘PM2.5的影响较为显着。
In order to understand the characteristics in PM2.5 fraction of soil dust in Nanchang city, PM2.5 samples in soil dusts were collected by a resuspension sampler, then the contents of nine water-soluble inorganic ions were detected by ion chromatography. The results showed that the content of total water-soluble ions was 11.126±2.703 mg/g. SO42- showed the highest content (3.568±1.553mg/g) in anions and Ca2+ showed the highest content (1.684±0.545mg/g) in cations. SO42-, NO3-, Ca2+ and Cl- were the main water-soluble ions in PM2.5 of soil dust, accounting for 80.60% of total water-soluble ions. Compared with other cities, the level of water-soluble ions in PM2.5 of soil dust in Nanchang was lower. The ratio of equivalent concentrations of cations to anions was 1.26, suggesting that PM2.5 of soil dust was slightly acidic. Spatial interpolation analysis showed that the contents of water-soluble ions in the southwest of Nanchang city were relatively higher, while most of the eastern and northern parts were at a lower level. The correlation analysis showed that Na+, F-, NH4+ had homology while K+ was not related to other ions. The ratios of NO3-/SO42- were from 0.26 to 0.97, indicating that the effects of fixed sources on the soil dust PM2.5 were more significant.