In order to understand the differences of precipitation pollution and deposition characteristic in Shenyang,the electrical conductivity,pH value,and concentration and deposition of water-soluble ion in precipitation were studied at Tiexi(urban)and Sujiatun(suburb)stations in Shenyang during 2018～2022.The results showed that the average pH values of two stations were 7.12(6.09～8.36)and 7.11(5.88～8.19),respectively,which indicated that precipitation was alkaline.The precipitation conductivity and the average concentration of total water-soluble ions at two sites were similar and showed a downward trend from 2018 to 2022.The mean relative acidity(FA)of the two sites in Shenyang was 0.0004,and the mean values of(Ca2++NH4+)/(SO42-+NO3-)were 1.57 and 1.61,respectively,indicating strong neutralization ability of alkaline ions.The ratio of NO3--/SO42-in precipitation was between 0.41 and 0.58.The wet deposition of SO42--S was 1.14 and 2.20 times that of NO3-N and NH4+-N,respectively,indicating that the precipitation in Shenyang was mainly dominated by sulfur deposition.The inorganic nitrogen deposition of urban station was generally higher than that of suburban station.The average deposition of NH4+-N was 1.74 and 1.78 times that of NO3--N,respectively,implying that inorganic nitrogen in precipitation in Shenyang was dominated by reduced nitrogen.This was mainly related to automobile exhaust,urban green land maintenance,human excrement and frequent agricultural activities in the suburbs.
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