| 北京地区地表水的硫同位素组成与环境地球化学 |
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| 引用本文： | 储雪蕾.北京地区地表水的硫同位素组成与环境地球化学[J].第四纪研究,2000,20(1):87-97. |
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| 作者姓名： | 储雪蕾 |
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| 作者单位： | 中国科学院地质与地球物理研究所!北京100029 |
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| 基金项目： | 中国科学院地球化学研究所环境地球化学国家重点实验室资助项目 |
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| 摘 要： | 对 1 994年密云、什刹海地区地表水中Cl-,SO2 -4 ,NO-3 含量和硫酸盐的δ3 4 S值监测表明 ,北京地区的地表水主要来源于大气降水。上游河水的δ3 4 S值高于本地区的大气降水 ,反映还有少量地下水的加入。潮河上游人类生活和耕作是造成潮河水中NO-3 含量高的主要原因。总体来讲 ,北京地区地表水的硫同位素组成同样具有夏季重、冬季轻的季节变化趋势 ;其全年的δ3 4 S值在 6‰～1 0‰之间 ,与我国南方大气降水为负的δ3 4 S值而北方为正值的区域分异现象吻合。对城区的什刹海与密云水库的硫同位素和SO2 -4 含量变化的分析表明 ,即使是冬季取暖季节 ,控制变化的主要因素是生物成因硫的释放 ,燃煤不可能造成如此明显的硫同位素组成的变化。
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| 关 键 词： | 地表水 北京地区 硫同位素 环境地球化学 |
| 收稿时间： | 1999-10-29 |
| 修稿时间： | 1999-10-29 |
SULFUR ISOTOPIC COMPOSITIONS AND ENVIRONMENTAL GEOCHEMISTRY OF SURFACE WATER IN BEIJING DISTRICT |
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| Chu,Xuelei.SULFUR ISOTOPIC COMPOSITIONS AND ENVIRONMENTAL GEOCHEMISTRY OF SURFACE WATER IN BEIJING DISTRICT[J].Quaternary Sciences,2000,20(1):87-97. |
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| Authors: | Chu Xuelei |
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| Institution: | Chu Xuelei
;(Institute of Geology and Geophysics, Chinese Academy of sciences, Beijing 100029) |
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| Abstract: | For the city zone and far forth suburb in Beijing, analytical results of sulfur isotopes of the 1994′ surface water have been reported first in this paper, these data,with analytical results of Cl-, SO 2-4, and NO -3concentrations, will provide valuable information on source of surface water, effect on surface water from human activity and valley environmental geochemistry in Beijing district. In 1994, all of the samples of surface water were collected monthly in the five locations of suburb Miyun county and city zone, Shisha Lake, of Beijing district. In Beijing district, the δ 34 S values of annual surface water ranged approximately from 6‰ to 10‰ and varied with season, i.e., maximum in February and minimum in September. All the δ 34 S values of surface water of Miyun and Shisha Lake were higher than 6.1‰, the δ 34 S value of meteoric water in this district. For Shisha Lake in city zone, however, the SO 2-4 concentrations varied largely with season. Specially, the concentration increased continuously up to near 39mg/L during August and September, but decreased suddenly in October similarly to the variation of Cl-concentration. In Chao River of Xinzhuang, annual concentrations of NO-3 were higher,10～25mg/L, that will be related to ecological and geographical environment of upriver of Chao River. Excrements, urine and nitrogen fertilizer released or used by human being will cause increase of NO-3 concentrations in Chao River. For the surface waters of Miyun area and Shisha Lake in 1994, the measured concentrations of Cl-, SO2- 4, and NO- 3 and δ 34 S values of sulfates indicate that the surface waters derive mainly from the meteoric water in the district. The fact that the δ 34 S values of Bai and Chao Rivers all were higher than the value of meteoric water in the area of Miyun Reservoir reflects a little amount of supply from ground water. For the surface waters in Beijing district, in general, the sulfur compositions possess aseasonal variation of heavier in winter and lighter in summer; annual δ 34 S values varied between 6‰ and 10‰ that is concordant with the regional differentiation observed by the previous, in which the δ 34 S value of meteoric water is negative in the south part of China, but it is positive in the north part. A large amount of biogenic sulfur release should affect on concentration and isotopic composition of sulfur in atmosphere and surface water; biogenic sulfur released from aquatic environment occupying a majority of surface of the Earth is an important source. Thus,biogenic sulfur not only controls seasonal variation of sulfur isotopic compositions in atmosphere and surface water, but also possibly becomes a major reason resulting in the regional differentiation of sulfur isotopic compositions. In the Shisha Lake of city zone, the SO2- 4 concentrations kept continuously higher, but the δ 34 S values were lower in the surface water since the midsummer. In view of this fact, the biogenic sulfur, which was released by a large amount of cultivated aquatic plants from bloom to decay, may be a major reason resulting in the lower isotopic compositions until winter, but combustion of coals in city zone could not cause so significant variation of sulfur isotopic compositions in the lake in winter. |
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| Keywords: | surface water Beijing district sulfur isotope environmental geochemistry |
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