本文關(guān)鍵詞： 西南酸雨區(qū) 降雨 pH 中和作用 離子來源　出處：《環(huán)境科學(xué)》2017年10期 　論文類型：期刊論文

【摘要】：西南酸雨區(qū)為我國主要酸雨沉降區(qū),且是全球三大喀斯特集中分布區(qū)之一.本文將該區(qū)9個地點(diǎn)的降雨資料進(jìn)行了總結(jié)、整理和分析,數(shù)據(jù)包括pH值和主離子成分(Cl~-、SO_4~(2-)、NO_3~-、Ca~(2+)、NH_4~+、Mg~(2+)、K~+、Na~+).該地區(qū)降雨中的主要陰離子為SO_4~(2-)和NO_3~-,主要陽離子為Ca~(2+)和NH_4~+.與我國其它地區(qū)相比,其酸性離子、堿性離子和總離子濃度均普遍高于東南地區(qū)、而低于我國北方地區(qū).西南酸雨區(qū)主要以pH值為4.5~5.6的弱酸性降雨為主,占總降雨頻次的58%左右.根據(jù)酸、堿性離子的相關(guān)性、中和因子等分析結(jié)果,該區(qū)雨水中的酸性物質(zhì)可能受到了堿性離子的中和作用,其中起主要中和作用的離子為Ca~(2+)和NH_4~+.將該區(qū)雨水pH值和酸、堿性離子濃度與我國其它地區(qū)進(jìn)行對比研究發(fā)現(xiàn),西南酸雨區(qū)降雨受到的中和作用要強(qiáng)于東南地區(qū),但弱于北方地區(qū)的降雨.通過對西南酸雨區(qū)降雨中主要離子來源的分析和估算,降雨中的酸性離子SO_4~(2-)和NO_3~-主要來自于人為污染;99.7%的Ca~(2+)和84.0%的Mg~(2+)為陸源貢獻(xiàn),這可能與西南地區(qū)碳酸鹽巖廣泛分布有關(guān).
[Abstract]:The southwest acid rain area is the main acid rain subsidence area in China, and is one of the three largest karst concentrated distribution areas in the world. The rainfall data of 9 sites in this area are summarized, sorted out and analyzed in this paper. The data include pH value and the main ion composition Cl-n-so _ 4 ~ + _ 2 ~ ~ ~ + ~ ~ ~. The concentrations of alkaline ions and total ions are generally higher than those in southeast China, but lower than those in northern China. The weak acid rainfall with pH value of 4.5 ~ 5.60% accounts for about 58% of the total rainfall frequency in the southwest acid rain area, according to the correlation of acid and alkaline ions. Neutralization factors and other analysis results show that the acidic substances in Rain Water in this area may be neutralized by alkaline ions, among which the main neutralizing ions are Ca~(2) and NH4-. The comparison of alkaline ion concentration with other areas in China shows that the precipitation in the southwest acid rain area is more neutralized than that in the southeast region. Through the analysis and estimation of the main ion sources in the southwest acid rain area, the acid ions so _ 4 ~ + ~ (2) and no _ 3 ~ (3), mainly from the Ca~(2 of 99.7% of the total anthropogenic pollution, and 84.0%% Mg~(2) contributed to the land source. This may be related to the widespread distribution of carbonate rocks in southwest China.
【作者單位】： 中國科學(xué)院地質(zhì)與地球物理研究所;中國科學(xué)院大學(xué);
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃(973)項(xiàng)目(2013CB956401)
【分類號】：X517

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本文編號：1539456