Field validation of sediment zinc toxicity
Field validation of sediment zinc toxicity
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DOI：
10.1897/04-031r.1
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发表时间：
2005-03
影响因子：
4.1
通讯作者：
G. A. Burton;L. Nguyen;Colin R. Janssen;R. Baudo;Ruth A. McWilliam;B. Bossuyt;M. Beltrami;A. Green
中科院分区：
文献类型：
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作者：
G. A. Burton;L. Nguyen;Colin R. Janssen;R. Baudo;Ruth A. McWilliam;B. Bossuyt;M. Beltrami;A. Green
进行了实地研究，以validateconcentrations的feshwater沉积物中的锌，底栖大型无脊椎动物群落的耐受性，并确定是否存在的关系与酸挥发性硫化物（AVS），同时提取的金属（SEM）模型。在湖泊和河流系统中，一种沉积物类型的AVS高，一种AVS低，这导致锌掺入沉积物的SEM与AVS比率从低到高不等。殖民托盘采样季节性，从6至37周的曝光，并使用几个适当的底栖指数进行了评价。在四个试验点的实地评估结果证实了AVS‐SEM模型的有效性，预测底栖大型无脊椎动物的影响正确率为92%。在SEM与AVS比率或AVS和有机（OC）归一化分数超过8和583 μmol/g OC的沉积物中，从加锌沉积物中观察到毒性。相反，当SEM与AVS比值或OC归一化AVS分数小于2或100 μmol/g OC时，未观察到毒性。OC浓度在148 ~ 154 μmol/g范围内，两种处理的毒性不同。沉积物中的总锌浓度没有关系，底栖生物的影响。受损最严重的底栖生物群落出现在高梯度的河流沉积物中，这些沉积物的OC和AVS浓度较低，在加标沉积物中SEM与AVS的比值为33和44。在SEM与AVS的比率为8.32和9.73时，五至六个底栖指标被压低。无明显作用水平似乎接近SEM与AVS的比值2，在比值2.34和2.94之间存在轻微或无作用。比率小于2的部位均未显示任何不良反应。
A fields study was conducted to validateconcentrations of zinc in feshwater sediments that are tolerated by benthic macroinvertebrate communities and to determine whether a relationship exists with the acid volatile sulfide (AVS)–simultaneously extracted metal (SEM) model. In both the lake and riverine systems, one sediment type was high in AVS and one low in AVS, which resulted in zinc‐spiked sediments that ranged from low to high SEM to AVS ratios. The colonization trays were sampled seasonally, ranging from 6 to 37 weeks of exposure, and were evaluated using several appropriate benthic indices. Results of the field evaluations at the four test sites confirmed the validity of the AVS‐SEM model, predicting benthic macroinvertebrate effects correctly 92% of the time. In sediments where the SEM to AVS ratio or the AVS and organic (OC)–normalized fractions exceeded 8 and 583 μmol/g of OC, toxicity was observed from the zinc‐spiked sediments. Conversely, when the SEM to AVS ratio or OC‐normalized AVS fractions were less than 2 or 100 μmol/g of OC, no toxicity was observed. In the range of 148 to 154 μmol/g of OC, toxicity varied in two treatments. Total zinc concentrations in sediments showed no relationship to benthic effects. The most impaired benthic community occurred in the high‐gradient stream sediments, which had low OC and AVS concentrations and SEM to AVS ratios of 33 and 44 in the spiked sediments. Five to six benthic metrics were depressed at SEM to AVS ratios of 8.32 and 9.73. The no‐observed‐effect level appeared to be near a SEM to AVS ratio of 2, with slight to no effects between ratios of 2.34 and 2.94. No sites with ratios of less than 2 showed any adverse effects.