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首页> 外文期刊>Water, Air, and Soil Pollution >PREDICTING HEAVY METAL CONCENTRATIONS IN THE SURFACE SEDIMENTS OF NORWEGIAN HEADWATER LAKES FROM ATMOSPHERIC DEPOSITION: AN APPLICATION OF A SIMPLE SEDIMENT-WATER PARTITIONING MODEL
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PREDICTING HEAVY METAL CONCENTRATIONS IN THE SURFACE SEDIMENTS OF NORWEGIAN HEADWATER LAKES FROM ATMOSPHERIC DEPOSITION: AN APPLICATION OF A SIMPLE SEDIMENT-WATER PARTITIONING MODEL

机译：从大气沉积量预测挪威头水湖表层沉积物中的重金属含量：简单的沉积物-水分配模型的应用

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Data from 96 headwater lakes from Norway are used to model heavy metal concentrations in surficial lake sediments in relation to atmospheric deposition. The study evaluates the application of sediment--water partitioning models at the field scale and finds optimum values for the partition coefficients. The impact of environment (sediment type, lake water pH, etc.) on KD values is explored directly by comparing KD estimates with environmental variables. KD values for each metal are found by optimising the fit between predicted and observed surface--sediment concentrations. The sensitivity of the KD estimates to data structure is examined by bootstrapping. KD values of l05.8 and l06.2 were calculated for cadmium (Cd) and lead (Pb), respectively, comparable to recent direct observations. Biogenic silica influenced KD values for Cd, Pb and Zn, whereas lake depth influenced Pb. pH did not have any detectable effect. KD for zinc (Zn) was less well defined, but higher than indi- cated by published experimental measurements. The results suggest that sediment-water partitioning models have an important contribution to make to field-scale lake studies of sediment heavy metals, and have important implications for palaeolimnological evaluations of heavy metal deposition.
机译：来自挪威的96个源头湖泊的数据用于模拟与大气沉积有关的表层湖泊沉积物中的重金属浓度。这项研究评估了田间规模的沉积物-水分配模型的应用，并找到了分配系数的最佳值。通过将KD估算值与环境变量进行比较，可以直接探索环境（沉积物类型，湖水pH值等）对KD值的影响。通过优化预测和观察到的表面沉积物浓度之间的拟合度，可以找到每种金属的KD值。通过自举检查KD估计值对数据结构的敏感性。分别计算出镉（Cd）和铅（Pb）的KD值分别为105.8和106.2，与最近的直接观测结果相当。生物硅影响了Cd，Pb和Zn的KD值，而湖泊深度影响了Pb。 pH没有任何可检测的作用。锌（Zn）的KD定义不明确，但高于已发表的实验测量结果。结果表明，沉积物-水的分配模型对沉积物重金属的田间规模的湖泊研究具有重要意义，并且对重金属沉积的古湖泊学评估具有重要意义。

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