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首页> 外文期刊>Environmental toxicology and chemistry >SPATIAL VARIATION OF METALS AND ACID VOLATILE SULFIDE IN FLOODPLAIN LAKE SEDIMENT
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SPATIAL VARIATION OF METALS AND ACID VOLATILE SULFIDE IN FLOODPLAIN LAKE SEDIMENT

机译：滩涂沉积物中金属和酸性挥发性硫化物的空间变化

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摘要

In risk assessment of aquatic sediments, much attention is paid to the immobilizing effect of acid volatile sulfide (AVS) on trace metals. The difference of AVS and simultaneously extracted metals (SEM) gives an indication of metal availability. In floodplain sediments, where changing redox conditions occur, AVS may play a major role in determining variation in metal availability. The importance of spatial heterogeneity has been recognized in risk assessment of trace-metal-polluted sediments. However, little is known about spatial variation of available metal fractions. We studied spatial variability of sediment, environmental conditions, total contaminant concentrations, and available metals (as SEM-AVS or SEM-AVS/f_(OC)) in a floodplain lake. The top 5 cm of sediment was sampled at 43 locations. Data were analyzed with correlation and principal component analysis as well as with geostatistical methods. Trace metal and SEM concentrations and most sediment characteristics were more or less constant within 10%. In contrast, AVS concentrations were much more variable and showed a strong spatial dependence due to differences in lake depth, total sulfur pools, and redox potential (E_h), which resulted in crucial differences in trace-metal availability within the lake. The spatial pattern of SEM-AVS deviates from total or normalized trace-metal patterns. This particularly has implications for risk assessment of sediments prone to dynamic hydrological conditions, where AVS concentrations are also variable in time.
机译：在水生沉积物的风险评估中，酸挥发性硫化物（AVS）对痕量金属的固定作用引起了很多关注。 AVS和同时提取的金属（SEM）的差异表明了金属的可用性。在洪泛区沉积物中，氧化还原条件发生变化，AVS可能在确定金属可利用性变化中起主要作用。空间异质性的重要性已在痕量金属污染沉积物的风险评估中得到认可。但是，关于可用金属部分的空间变化知之甚少。我们研究了洪泛区湖泊中沉积物的空间变异性，环境条件，总污染物浓度和可用金属（如SEM-AVS或SEM-AVS / f_（OC））。在43个位置对顶部5厘米的沉积物进行了采样。通过相关性和主成分分析以及地统计方法对数据进行了分析。痕量金属和SEM浓度以及大多数沉积物特征在10％内基本保持恒定。相反，由于湖泊深度，总硫池和氧化还原电位（E_h）的差异，AVS浓度的变化更大，并且显示出强烈的空间依赖性，这导致了湖泊中痕量金属的利用率存在重大差异。 SEM-AVS的空间图案与总的或归一化的痕量金属图案不同。这尤其对容易发生动态水文条件的沉积物的风险评估有影响，在这种情况下，AVS浓度也会随时间变化。

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