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首页> 外文期刊>Journal of Environmental Science and Health >Spatiotemporal trend analysis of metal concentrations in sediments of a residential California stream with toxicity and regulatory implications
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Spatiotemporal trend analysis of metal concentrations in sediments of a residential California stream with toxicity and regulatory implications

机译：加利福尼亚居民河流中沉积物中金属浓度的时空趋势分析，具有毒性和监管意义

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The objective of this study was to determine if concentrations of arsenic, cadmium, chromium, copper, lead, nickel and zinc measured in the sediments of a residential stream in California (Pleasant Grove Creek) have changed temporally or spatially from 2006 to 2016. Threshold Effect Levels (TELs), conservative ecological effects benchmarks, and exceedances for the seven metals were also evaluated over the 11-year time period to provide insight into potential metal toxicity to resident benthic communities. In addition, the bioavailability of metals in sediments was also determined by calculating Simultaneous Extracted Metal/Acid Volatle Sulfide (SEM/AVS) ratios to allow an additional assessment of toxicity. Regulatory implications of this data set and the role of metal toxicity are also discussed. Stream-wide temporal trend analysis showed no statistically significant trends for any of the metals. However, spatial analysis for several sites located near storm drains did show a significant increase for most metals over the 11-year period. TEL exceedances during the 7years of sampling, spanning 2006-2016, were reported for all metals with the number of exceedances ranging from 47 for copper and zinc to 1 for lead. A spatial analysis showed that the highest number of TEL exceedances and the highest number of SEM/AVS ratios greater than one with at least one metal exceeding a TEL occurred at upstream sites. The potentially toxic metal concentrations reported in Pleasant Grove Creek should be used in the 303 (d) listing process for impaired water bodies in California.
机译：这项研究的目的是确定从2006年至2016年，加利福尼亚（宜人的格罗夫克里克）居民流沉积物中测得的砷，镉，铬，铬，铜，铅，镍和锌的浓度是否随时间或空间发生变化。在11年的时间段内，还对七种金属的影响水平（TELs），保守的生态影响基准和超标进行了评估，以提供对居民底栖生物潜在的金属毒性的见解。此外，还可以通过计算同时提取的金属/酸性挥发性硫化物（SEM / AVS）比值来确定沉积物中金属的生物利用度，从而进一步评估毒性。还讨论了该数据集的法规含义以及金属毒性的作用。整个溪流的时间趋势分析表明，任何金属都没有统计学上的显着趋势。但是，对位于雨水渠附近的几个地点的空间分析的确显示，在11年的时间内，大多数金属的使用量显着增加。据报告，在2006年至2016年的7年的采样期内，所有金属的TEL超出标准，其数量范围从铜和锌的47到铅的1。空间分析表明，在上游站点发生的TEL超出次数最多，而SEM / AVS比值大于1，且至少一种金属超过TEL。在303（d）列出的加利福尼亚受损水体中，应使用Pleasant Grove Creek中报告的潜在有毒金属浓度。

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