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首页> 外文期刊>Environmental toxicology and chemistry >RELATING THE SEDIMENT PHASE SPECIATION OF ARSENIC, CADMIUM, AND CHROMIUM WITH THEIR BIOAVAILABILITY FOR THE DEPOSIT-FEEDING POLYCHAETE NEREIS SVCCINEA
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RELATING THE SEDIMENT PHASE SPECIATION OF ARSENIC, CADMIUM, AND CHROMIUM WITH THEIR BIOAVAILABILITY FOR THE DEPOSIT-FEEDING POLYCHAETE NEREIS SVCCINEA

机译：与砷，镉和铬在沉积物中的形态有关，以其对可饲喂多叶神经猪球藻的生物利用度

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We studied the influence of sediment geochemistry on bioavailability of As, Cd, and Cr in deposit-feeding polychaetes. Metal phase speciation in sediments was determined with a sequential extraction scheme, and assimilation efficiencies (AEs) of ingested metals were determined by pulse-chase feeding experiments using -y-emitting isotopes. Worms were fed sediments collected from geochemically diverse estuaries that were labeled by sorbing dissolved radiotracers or mixing with radiolabeled algae. Uptake of sediment-bound metals was compared with that from labeled algae or goethite. Metal AEs showed a positive relationship with the exchangeable and carbonate sedimentary fractions, whereas metals in iron and manganese oxides and acid-volatile sulfides, or in pyrite and other refractory material, were inversely correlated with AEs. Arsenic was most bioavailable from algae (72%), less from sediments mixed with algae (24-70%) and least from sediments labeled directly (1-12%). Arsenic AEs in sediments labeled directly showed a positive correlation with sedimentary Mn and Al and negative correlation with Fe. Cadmium AEs were positively correlated with salinity and negatively correlated with sedimentary organic C. The AEs of Cr from sediments or algae were less than 5%, but they were 34% from pure goethite. By quantifying the relationship of metal speciation in sediments with their bioavailability for deposit-feeding polychaetes, the present study provides new insight into understanding metal bioaccumulation in benthic invertebrates.
机译：我们研究了沉积物地球化学对以沉积物为食的多毛动物体内砷，镉和铬生物利用度的影响。通过顺序提取方案确定沉积物中的金属相形态，并通过使用-y发射同位素的脉冲追逐进料实验确定摄入金属的同化效率（AEs）。蠕虫被喂食从地球化学多样化的河口收集的沉积物，这些沉积物通过吸附溶解的放射性示踪剂或与放射性标记的藻类混合来标记。将与沉积物结合的金属的吸收与标记藻类或针铁矿的吸收进行了比较。金属AE与可交换的碳酸盐沉积级分呈正相关，而铁和锰的氧化物和酸挥发性硫化物或黄铁矿和其他耐火材料中的金属与AE呈负相关。藻类中砷的生物利用率最高（72％），与藻类混合的沉积物中砷的利用率较低（24-70％），直接标记的沉积物中砷的利用率最低（1-12％）。直接标记的沉积物中的砷AEs与沉积的Mn和Al呈正相关，与Fe呈负相关。镉AEs与盐度呈正相关，与沉积有机碳呈负相关。沉积物或藻类中Cr的AEs小于5％，而纯针铁矿中Cr的AEs则为34％。通过量化沉积物中金属形态与其对沉积物供养的多毛类动物的生物利用度之间的关系，本研究为了解底栖无脊椎动物中的金属生物积累提供了新的见识。

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