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Demonstrating the Appropriateness of Developing Sediment Quality Guidelines Based on Sediment Geochemical Properties

机译：证明根据沉积物地球化学特性制定沉积物质量准则的适当性

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The pool of bioavailable metals in sediments is typically much smaller than the total metal concentration and is strongly influenced by metal-binding with acid-volatile sulfide (AVS), particulate organic carbon (OC), and iron and manganese oxide solid phases. We have investigated how the properties of relatively oxidized sediments influence the exposure and effects of copper on the survival and growth rate of the deposit-feeding benthic bivalve Tellina deltoidalis. Growth rate was a much more sensitive end point than survival. Toxic effects to growth were consistently observed in sediment where both pore water and overlying water copper concentrations were below the effect threshold for dissolved copper. Decreases in growth of the bivalve were largely attributable to dietary exposure to sediment-bound copper, as the organism was observed to actively feed on fine materials from the sediment surface. For sediments with the same total copper concentrations, effects were less for sediments with greater concentrations of fine particles (<63 μm sediment) or particulate organic carbon (OC). Based on the concentration-response relationship, a no-effect value of 5.5 mg <63 μm Cu g_(-1) OC for growth of T. deltoidalis was calculated. The results confirm the appropriateness of using OC-normalized copper concentration in the <63 μm sediment fraction to develop sediment quality guidelines (SQGs) that vary with sediment properties. For sediments where the amount of AVS is not sufficient to bind metals in non bioavailable forms, the metal-binding capacity provided by OC and iron and manganese oxyhydroxides associated with the fine sediments considerably reduced metal bioavailability. These sediment properties should be considered when assessing the risks posed by metal-contaminated sediments.
机译：沉积物中可生物利用的金属库通常比总金属浓度小得多，并且受与酸挥发性硫化物（AVS），颗粒有机碳（OC）以及铁和锰氧化物固相的金属结合力的强烈影响。我们已经研究了相对氧化的沉积物的性质如何影响铜的暴露以及铜对以沉积物为食的底栖双壳类Tellina deltoidalis的存活和生长速率的影响。增长率是比生存更为敏感的终点。在孔隙水和上层水铜浓度均低于溶解铜的影响阈值的沉积物中，始终观察到对生长的毒性作用。双壳类动物生长的减少主要归因于饮食中与沉积物结合的铜的暴露，因为观察到该生物体积极地从沉积物表面捕食细小物质。对于总铜浓度相同的沉积物，细颗粒（<63μm沉积物）或有机碳颗粒（OC）浓度较高的沉积物的影响较小。基于浓度-响应关系，计算出三角洲锥虫生长的5.5 mg <63μmCu g _（-1）OC无影响值。结果证实了使用<63μm沉积物分数中的OC归一化铜浓度来制定随沉积物性质而变化的沉积物质量准则（SQG）的适当性。对于AVS量不足以结合非生物利用形式的金属的沉积物，OC和与精细沉积物相关的铁和氢氧化锰铁提供的金属结合能力大大降低了金属的生物利用度。在评估金属污染的沉积物带来的风险时，应考虑这些沉积物的性质。

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  • 来源
    《Environmental Science & Technology》 |2013年第13期|7483-7489|共7页
  • 作者

    Olivia Campana; Julian Blasco; Stuart L. Simpson;

  • 作者单位

    Institute de Ciencias Marinas de Andalucia (CSIC), Campus Universitario Rio San Pedro, s 11519 Puerto Real, Cadiz, Spain,Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, New South Wales 2232, Australia;

    Institute de Ciencias Marinas de Andalucia (CSIC), Campus Universitario Rio San Pedro, s 11519 Puerto Real, Cadiz, Spain;

    Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, New South Wales 2232, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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