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Seasonal variations and characteristics differences in the fluorescent components of extracellular polymeric substances from mixed biofilms in saline lake

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Science Bulletin 2017年第11期62卷 764-766页

作者： mashura shammi Xiangliang Pan Khan M.G. Mostofa Daoyong Zhang Cong-Qiang Liu Laboratory af Bioremediation Department of Environmental Pollution and Process Control Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Department of Environmental Sciences Jahangirnagar University Dhaka 1342 Bangladesh Institute of Surface-Earth System Science Tianjin University Tianjin 300072 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China University of Chinese Academy of Sciences Beijing 100049 China

Cyanobacteria are the Earth’s oldest oxygenic photoautotrophs and have had major impacts on shaping the *** long evolutionary history($3.5 bya)has enabled them to adapt to geochemical and climatic changes and,more recently,anthropogenic modifications of aquatic environments,including nutrient overenrichment(eutrophication),water diversion,withdrawal。

关键词：胞外聚合物季节变化生物膜特征组分荧光混合盐湖

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A study of groundwater irrigation water quality in south-central Bangladesh: a geo-statistical model approach using GIS and multivariate statistics

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Acta Geochimica 2018年第2期37卷 193-214页

作者： M.Atikul Islam Md.Mostafizur Rahman Md.Bodrud-Doza Md.Iftakharul Muhib mashura shammi Anwar Zahid Yeasmin Akter Masaaki Kurasaki Department of Chemistry Hajee Mohammad Danesh Science and Technology University Department of Environmental Sciences Jahangirnagar University Graduate School of Environmental Science Hokkaido University Department of Environmental Pollution and Process Control Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Groundwater Hydrology Bangladesh Water Development Board Department of Chemistry University of Chittagong

Southern Bangladesh＇s irrigation and drinking water is threatened by saline intrusion. This study aimed to establish an irrigation water quality index （IWQI） using a geostatistical model and multivariate indices in Gopalganj district, south-central Bangladesh. Groundwater samples were taken randomly （different depths） in two seasons （wet-monsoon and dry-monsoon）. Hydrochemical analysis revealed groundwater in this area was neutral to slightly alkaline and dominating cations were Na^＋, Mg^2＋, and Ca^2＋ along with major anions Cl^- and HCO3^-. Principal component analysis and Gibbs plot helped explain possible geochemical processes in the aquifer. The irrigation water evaluation indices showed： electrical conductivity （EC）〉750 μS/cm, moderate to extreme saline; sodium adsorption ratio （SAR）, excellent to doubtful; total hardness （TH）, moderate to very hard; residual sodium bicarbonate, safe to marginal; Kelly＇s ratio 〉1; soluble sodium percentage （SSP）, fair to poor; magnesium adsorption ratio, harmful for soil; and IWQI, moderate to suitable. In addition, the best fitted semivariogram for IWQI, EC, SAR, SSP, and TH confirmed that most parameters had strong spatial dependence and others had moderate to weak spatial dependence. This variation might be due to the different origin/sources of major contributing ions along with the influence of variable river flow and small anthropogenic contributions. Furthermore, the spatial distribution maps for IWQI, EC, SSP, and TH during both seasons confirmed the influence of salinity from the sea; low-flow in the major river system was the driving factor of overall groundwater quality in the study area. These findings may contribute to management of irrigation and/or drinking water in regions with similar groundwater problems.

关键词： Semivariogram Ordinary kriging model Salinity Irrigation water quality index GIS Hydrochemistry

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