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Distribution of arsenic between the particulate and aqueous phases in surface water from three freshwater lakes in China

机译：Distribution of arsenic between the particulate and aqueous phases in surface water from three freshwater lakes in China

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摘要

Total arsenic (As) in suspended particulate matter (SPM) of lacustrine ecosystems has been extensively documented, but knowledge on the distribution of As between the particle and aqueous phases in freshwater lakes remains largely unknown. The present study employed a rapid method to determine the total and dissolved As and As in SPM at sites covering the entire areas of three large shallow lakes in China, e.g., Taihu, Chaohu, and Dianchi, to obtain a "representative" mean value of the As concentration in various phases. The average concentrations of total and dissolved As were below 6.0 and 3.3 mu g/L, respectively. Arsenic in SPM was much higher than that in waters, as ranging from 24.7 to 516 mu g/g. Lake Taihu exhibited extensive seasonal variation both in total and dissolved As, while little difference was observed in SPM concentration, with an average value of 54.2 and 49.3 mg/L in winter and summer, respectively. Among the algae in the three lakes, Cyanophyta dominated in both cell abundance and biomass. Algae mass occupied significant parts of SPM, especially in Dianchi; the proportions of algae in the SPM fractions were measured as 10.4 and 7.1 % in Taihu in winter and summer, 4.5 % in Chaohu, and 53.3 % in Dianchi, both in summer season. The total As in SPM had a significant positive relationship with total As in water and a high distribution coefficient (Kd) between SPM and dissolved fraction of As at all three lakes. The high proportions of Algae, especially Cyanophyta in the composition of SPM in the three large shallow lakes, might play an important role in affecting the As distribution between the aqueous and particulate phases in aquatic ecosystem.
机译：湖泊生态系统中悬浮颗粒物（SPM）中的总砷（As）已有大量文献记载，但是关于淡水湖中颗粒与水相之间As的分布的知识仍然未知。本研究采用一种快速的方法来确定覆盖中国三个大型浅湖（如太湖，巢湖和滇池）整个区域的站点中SPM中的总砷和溶解砷，从而获得“代表性”平均值。不同阶段的砷浓度。总砷和溶解砷的平均浓度分别低于6.0和3.3μg / L。 SPM中的砷比水中的砷高得多，为24.7至516μg / g。太湖的总砷和溶解态砷均表现出较大的季节性变化，而SPM浓度差异不大，冬季和夏季的平均值分别为54.2和49.3 mg / L。在这三个湖泊的藻类中，蓝藻在细胞丰度和生物量方面均占主导地位。藻类占据了SPM的重要部分，尤其是在滇池。在夏季和夏季，太湖的藻类比例分别为10.4％和7.1％，巢湖为4.5％，滇池为53.3％。 SPM中的总砷与水中的总As呈显着正相关，并且在所有三个湖泊中SPM和As的溶解分数之间都具有较高的分配系数（Kd）。在三个大的浅水湖泊中，藻类，尤其是蓝藻在SPM组成中的比例很高，可能在影响水生生态系统中水相和颗粒相之间的As分布方面起着重要作用。

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