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Diurnal hydrological controls and non-filtration effects on minor and trace elements in stream water draining the Qiyi Glacier, Qilian Mountain

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Science China Earth Sciences 2013年第1期56卷 81-92页

作者： LI XiangYing QIN DaHe JING ZheFan LI YueFang WANG NingLian State Key Laboratory of Cryospheric Science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

Diurnal minor and trace elements in glacial outflow water draining the Qiyi Glacier and associated hydrological controls as well as the filtration effects on water chemistry were examined. Results show that major ions, Li, St, and Ba are exported pre- dominately as mobile monovalent or divalent ions and are controlled by hydrological variations over the diurnal cycle exhibit- ing an inverse concentration with discharge, suggesting that Li, Sr, and Ba can be used as tracers in subglacial hydrological investigations. Conversely, other elements （e.g. Fe, Al, and Cr） exhibit variations that are not strongly correlated with the dis- charge reflecting the physicochemical controls. The non-filtered operation appears not to strongly influence Sr and Ba, but has an effect on some elements such as Fe, Al, V, Ti, and Co, indicating that these changed elements are transported in particulate forms and thus their concentrations are highly dependent on particulate numbers in solutions. This implies that the immediate filtration after sampling is essential in hydrochemical studies at Alpine glacial basins due to subsequent mineral dissolution.

关键词： minor and trace elements filtration stream water Qiyi Glacier Qilian Mountain

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Changing Concentrations of Heavy Metals in stream water as a Result of Slurry Application to Soil

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Journal of Agricultural Science and Technology(A) 2012年第4期2卷 473-480页

作者： M. Mercedes Taboada-Castro M. Luz. Rodriguez-Blanco Antonio Dieguez M. Teresa Taboada-Castro Faculty of Sciences University of A Coruna A Zapateira A Coruna 15008 Spain

Several studies focused on nutrients have shown that land use and management practices have a strong influence on stream chemistry. Much less is known about the relationship between heavy metal concentrations in stream water and land use. We compared the variability of trace element concentrations in the stream of a catchment exposed to different types of management practices and land use. This is a small catchment with previous agricultural diffuse and accidental pollution mainly due to the spreading of slurry. The agricultural land was reforested in July 1998. The concentrations of Fe, Mn, Cu and Zn in dissolved phase from surface water samples collected at the catchment outlet were determined over a period of approximately six years. The results suggest that dissolved metal concentrations, especially Cu and Mn, are controlled by the land use and management practices. The median concentrations of studied metals were the highest in the agricultural period. It was also during this period when they all presented the highest concentration peaks, coinciding with a time of heavy application of manure to the soil. Dissolved Fe and Mn showed high dependence of flow rate, whereas Cu and Zn concentrations seemed to be independent of flow.

关键词： Heavy metals agricultural pollution slurry stream water

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stream water chemistry and nitrogen export from a subtropical-forested catchment in Hunan in central-southern China

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Acta Geochimica 2006年第S1期 211-211页

作者： Gong ZHANG1, Guangming ZENG1, Chunyan DU1, Xiaokang SU1, Yimin JIANG2, Guohe HUANG3 1 College of Environmental Science and Engineering, Hunan University, Changsha 410082, China 2 Hunan Environmental Protection Buearu, Changsha 430072, China 3 Faculty of Engineering, Regional University, Canada

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Dissolved organic sulfur in streams draining forested catchments in southern China

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Journal of Environmental Sciences 2012年第4期24卷 704-710页

作者： Zhanyi Wang Xiaoshan Zhang Zhangwei Wang Yi Zhang Bingwen Li Rolf Vogt Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China College of Ecology and Environmental Science Inner Mongolia Agricultural UniversityHohhot 010018China Department of Chemistry University of OsloP.O.BOX 1033BlindernN-0315 OsloNorway

Dissolved organic sulfur （DOS） is an important fraction for sulfur mobilization in ecosystem. In this work stream waters were sampled in 25 forested sites in southern China to study the dissolved sulfur fractions. Dissolved sulfur was fractionated into dissolved organic sulfur （DOS） and inorganic sulfate （SO]-） for 95 stream water samples. The results showed that the concentration of DOS ranged from 0 to 13.1 mg/L （average 1,3 mg/L） in all the streams, High concentrations of DOS in stream waters were found in the sites with high concentrations of sulfate. DOS constituted less than 60.1% of dissolved sulfur （average 17.9%）. Statistical analysis showed that DOS concentration was correlated with SO42- in streams waters and total sulfur in surface layer soils. The results also showed that DOS concentration in stream waters had a seasonal variation, but no trends were found with it. The implication was that the long term sulfur deposition had led the increase of the concentration and fraction of DOS in stream waters in acid rain prevailing regions

关键词： dissolved organic sulfur stream water Chinese forests sulfur deposition

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