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首页> 外文期刊>Environmental toxicology and chemistry >EFFECT OF 3,4,3′,4′-TETRACHLOROBIPHENYL ON THE REWORKING BEHAVIOR OF LUMBRICULUS VARIEGATUS EXPOSED TO CONTAMINATED SEDIMENT
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EFFECT OF 3,4,3′,4′-TETRACHLOROBIPHENYL ON THE REWORKING BEHAVIOR OF LUMBRICULUS VARIEGATUS EXPOSED TO CONTAMINATED SEDIMENT

机译：3,4,3'，4'-四氟邻苯二甲酰对污染的底LU的再加工行为的影响

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The reworking response (bioturbation) of the oligochaete Lumbriculus variegatus was measured by following the burial rate and spread of a ~(137)Cs marker layer translating worm activity into a biological burial rate (W_b) and a biological diffusion rate constant (D_b) for surficial sediment mixing. Reworking was measured at 10 and 22℃ in two sediments: a reference site sediment dosed with 3,4,3′,4′-tetrachlorobiphenyl (TCBP) and a field-collected sediment from a polychlorinated biphenyl(PCB)-contaminated site in Dicks Creek (DCC, Middletown, OH, USA). The body residue associated with response to TCBP also was determined. Reduction in the temperature from 22 to 10℃ reduced both W_b and D_b by a factor of approximately two. The internal TCBP concentration to reduce the W_b by 50% was 96 nmol/g (95% CI 45-225 nmol/g) and 124 nmol/g (40-547 nmol/g) (28 and 36 μg/g) wet weight at 22 and 10℃, respectively, and was independent of temperature. The W_b for the DCC sediment was lower than observed for the highest TCBP treatment. The internal body residue for total PCB for worms exposed to DCC sediment was 20-fold lower than TCBP in worms exposed to the lowest TCBP treatment on a molar basis. Comparing body residues of total PCB to TCBP assumes that the PCB congeners act additively on a molar basis. The DCC site contained a higher proportion of coarse material and a lower organic carbon concentration. The difference in sediment characteristics was assumed to be. responsible for differences in the W_b.
机译：通过跟踪埋葬率和〜（137）Cs标记层的传播，将蠕虫的活动转化为生物埋葬率（W_b）和生物扩散率常数（D_b），来测量变异小Lu豆的返工响应（生物扰动）。表层沉积物混合。在10和22℃下测量了两种沉积物的返工：添加了3,4,3'，4'-四氯联苯（TCBP）的参考位点沉积物和来自Dicks的多氯联苯（PCB）污染位点的现场收集的沉积物Creek（DCC，美国俄亥俄州米德尔敦）。还确定了与对TCBP的反应有关的身体残留。将温度从22降低到10℃，W_b和D_b降低了大约两倍。将W_b降低50％的内部TCBP浓度为96 nmol / g（95％CI 45-225 nmol / g）和124 nmol / g（40-547 nmol / g）（28和36μg/ g）湿重分别在22℃和10℃下，并且与温度无关。 DCC沉积物的W_b低于最高TCBP处理的观察值。暴露于DCC沉积物的蠕虫体内总PCB的内部残留量比暴露于最低TCBP处理的蠕虫的摩尔比基于TCBP低20倍。将全部PCB的残留物与TCBP进行比较时，假定PCB同类物以摩尔为基础相加作用。 DCC站点包含较高比例的粗物质和较低的有机碳浓度。假定沉积物特征不同。造成W_b的差异。

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