黃河下游地區(qū)河水主要離子和鍶同位素的地球化學特征

摘要： 對黃河下游地區(qū)河水主要陰陽離子、鍶元素及其同位素組成進行了分析.結(jié)果發(fā)現(xiàn)其水化學組成主要以Ca~(2+),Na~+,HCO_3~-和SO_4~(2-)離子為主,分別占陰陽離子組成的75%以上.干流與支流間在化學組成上存在顯著差異,黃河干流的SO_4~(2-),NO_3~-和Cl~-具有共同的來源,而支流河水中的SO_4~(2-),NO_3~-和Cl~-來源不同.黃河下游具有較高的鍶含量及較低的鍶同位素組成,鍶含量變化范圍在0.0429 mg·l~(-1)-0.936mg·l~(-1)之間,平均含量為0.394 mg·l~(-1),鍶同位素組成變化范圍在0.70986-0.71139之間,平均值為0.71118,其中黃河人�？诘逆J同位素組成(~(87)Sr/~(86)Sr=0.70986)與現(xiàn)代海水鍶同位素比值(0.70916)相近,表明其鍶同位素組成受海水作用影響較大.對主要元素、微量元素鍶及其同位素組成分析研究發(fā)現(xiàn),黃河下游地區(qū)河水鍶同位素組成主要源于蒸發(fā)鹽巖和碳酸鹽巖的風化溶解作用,而人類活動的影響相對較小.由鍶同位素平衡方程計算得出,黃河下游地區(qū)河水鍶同位素組成由大氣降水和巖石風化作用混合而成,其中大氣降水對黃河下游地區(qū)~(87)Sr/~(86)Sr的貢獻率約為30%,而巖石風化對其貢獻率約為70%. Abstract： The Yellow River is one of the largest rivers in China, and plays significant role in the development of the society and economy, as well as the ecosystem health in northern China. Major ions and the strontium isotopic composition are important geochemical characters of the water body, and provide insight into the regional hydrogeochemistry, rock weathering rates in drainage basins, and anthropogenic influences on the river. This study determined ~(87)Sr/~(86)Sr ratios and concentration of Sr and major anions and cations in 16 water samples from the lower reach of the Yellow River. Ca~(2+) , Na~+ , HCO_3~- and SO_4~(2-) are the dominant ions. The concentration of the ions accounts for more than 75% in the respective categories, and differ significantly between the tributary and the mainstream. Sources of SO_4~(2-), NO_3~- and Cl~- are homogenized in the mainstream, while clearly different in the tributaries. The lower section of the reach is higher in Sr concentration while lower in the Srisotope composition, which range from 0.0429mg ·l~(-1) to 0.936mg ·l~(-1) and from 0.70986 to 0.71139, respectively. The isotopic composition in the estuary is similar to that of the sea water, suggesting that the isotopic geochemistry has been under the control of the sea. The research of major elements, the Sr concentration and ~(87)Sr/~(86)Sr ratios show that the weathering of carbonates and evaporates in the drainage basins are responsible for the high water Sr concentrations. According to the balance equation of Sr, the Sr in river water is derived from two end members, that is, the ratio of ~(87)Sr/~(86)Sr from atmosphere precipitation is about 30% and from rock weathering is about 70%. 作 者： 王兵    李心清    袁洪林    周會    趙彥龍    WANG Bing    LI Xin-qing    YUAN Hong-lin    ZHOU Hui    ZHAO Yan-long   作者單位： 王兵,周會,WANG Bing,ZHOU Hui(中國科學院地球化學研究所環(huán)境地球化學國家重點實驗室,貴陽,550002;中國科學院研究生院,北京,100049)

李心清,LI Xin-qing(中國科學院地球化學研究所環(huán)境地球化學國家重點實驗室,貴陽,550002)

袁洪林,YUAN Hong-lin(西北大學地質(zhì)學系大陸動力學國家重點實驗室,西安,710069)

趙彥龍,ZHAO Yan-long(廣東省廣州市珠汀流域水資源保護局,廣州,510611) 

期 刊： 環(huán)境化學  ISTICPKU   Journal： ENVIRONMENTAL CHEMISTRY  年，卷(期)： 2009, 28(6)  分類號： X13  關鍵詞： 鍶元素    黃河    風化作用    氣候變化    水化學    水污染.    Keywords： Srelement    the Yellow River    rock weathering    climate change    water chemistry    water pollution.   

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