Department of Civil and Environmental Engineering, Pusan National University, Busan, 46241, Republic of Korea.
College of Fisheries and Ocean Sciences, Chonnam National University, Yeosu, 61186, Republic of Korea.
Environ Pollut. 2021 Nov 1;288:117789. doi: 10.1016/j.envpol.2021.117789. Epub 2021 Jul 13.
The occurrence and distribution of cyclic and linear siloxanes were investigated in South Korean river water and sediment, with a special focus on crucian carp tissues, to evaluate the residual status and potential bioaccumulation of siloxanes. The total siloxanes median concentrations observed in this study were 1495 ng/L in river water, 39.2 ng/g-dry weight [dw] in sediment, and 41.7 ng/g-wet weight [ww] in crucian carp muscle. Cyclic siloxanes (D3-D6) were predominant in all matrices, and D5 (mean: > 81%) was more abundant in biota tissues than in river water (30%) and sediment (26%) samples. Specifically, positive correlations between D5 concentrations and crucian carp sizes (p < 0.01, Spearman) as well as the relatively high estimated biota-sediment accumulation factor value of D5 (D5: 2.31), suggest the high bioaccumulative property of D5 in biota. However, no bioaccumulation potentials were observed for D3, D4, D6, and L3-L17 in this field-scale study. The distributions of major linear siloxanes (L7-L14) in crucian carp gills (17%) and gonads (21%) were higher than in other tissues (brain, 9.6%; liver, 2.6%; muscle, 1.5%). Moreover, relatively high tissue/plasma ratios were observed for linear siloxanes (L7-L10: 1.79-2.12) compared to cyclic siloxanes (D4-D6: 0.829-1.18) (p < 0.01, Mann Whitney U test), which indicated the higher transportability of linear siloxanes to fish tissues than cyclic siloxanes.
本研究调查了韩国河水和沉积物中环型和线型硅氧烷的分布和存在情况，特别关注鲫鱼组织，以评估硅氧烷的残留状况和潜在生物蓄积性。本研究中观察到的总硅氧烷中位数浓度分别为河水 1495ng/L、底泥 39.2ng/g-干重[dw]和鲫鱼肌肉 41.7ng/g-湿重[ww]。所有基质中环型硅氧烷（D3-D6）为主，生物组织中 D5（平均值：>81%）的丰度高于河水（30%）和底泥（26%）样品。具体而言，D5 浓度与鲫鱼大小之间存在显著正相关关系（p<0.01，Spearman），以及 D5 的相对较高的估计生物-沉积物积累因子值（D5：2.31），表明 D5 在生物体内具有较高的生物蓄积性。然而，在这项现场研究中，未观察到 D3、D4、D6 和 L3-L17 的生物蓄积潜力。主要线型硅氧烷（L7-L14）在鲫鱼鳃（17%）和性腺（21%）中的分布高于其他组织（脑，9.6%；肝，2.6%；肌肉，1.5%）。此外，与环状硅氧烷（D4-D6：0.829-1.18）相比，线型硅氧烷（L7-L10：1.79-2.12）的组织/血浆比值较高（p<0.01，Mann Whitney U 检验），这表明线型硅氧烷比环状硅氧烷更易向鱼类组织转运。
