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首页> 外文期刊>Environmental Science & Technology >Long-Term (1970-2017) Temporal Trends of Polychlorinated Biphenyls in Fish, Settling Material, and Sediments from Populated and Remote Sites in Rio de la Plata Estuary, Argentina
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Long-Term (1970-2017) Temporal Trends of Polychlorinated Biphenyls in Fish, Settling Material, and Sediments from Populated and Remote Sites in Rio de la Plata Estuary, Argentina

机译：阿根廷里约拉普拉塔河口鱼类，定居点和偏远地区鱼类，沉降材料和沉积物中多氯联苯的长期趋势（1970-2017年）

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摘要

Temporal trends of polychlorinated biphenyls (PCBs) were studied for detritivorous fish (1996-2017) and settling material (2002-2017) from polluted Buenos Aires coast and for a dated sediment core (1970-2013) from the outer Rio de la Plata estuary. In spite of contrasting concentrations [5.3 +/- 6.3 mu g.g(-1) dry weight (dw) for fish, 48 +/- 26 ng.g(-1) dw for settling material, and 1.5 +/- 0.7 ng.g(-1) dw for core], all three revealed exponentially decreasing trends over time (97%, 83%, and 83%, respectively). Time trends showed peak maxima coincident with Argentina's period of maximum PCB usage in 1973-1980 (80 cm depth in the core) and pulse discharges related to PCB banning in 2001-2002 (fish) with a lighter signature enriched in less persistent tri- and tetrachlorobiphenyls. The log-linear PCB time trends compare well with the predicted decrease for a high emission scenario from global emission data; the best fit was observed for the less impacted sediment core (-2%.year(-1) versus -3%. year for emission scenario). Steeper slopes are observed for the more polluted settling material (-5%.year(-1)) and especially for fish, in which the background decline trend tripled after the 2001 PCB pulse (from -7%.year(-1) to -21%.year(-1)). These PCB time trends in related environmental compartments from contrasted sites provide rare evidence for evaluating the effectiveness of control measures in southern South America.
机译：研究了受污染的布宜诺斯艾利斯海岸的有害鱼类（1996-2017年）和沉降材料（2002-2017年）以及里约热内卢河口外的陈旧沉积物芯（1970-2013年）的多氯联苯（PCBs）的时间趋势。 。尽管有不同的浓度[鱼的干重为（5.3 +/- 6.3 mu gg（-1）dw），沉降材料为[48 +/- 26 ng.g（-1）dw，1.5 +/- 0.7 ng]。 g（-1）dw（对于核心），所有这三个变量都显示出随时间呈指数下降的趋势（分别为97％，83％和83％）。时间趋势显示最大峰值与阿根廷在1973-1980年间最大使用PCB的时期（岩心深80厘米）以及2001-2002年与PCB禁令相关的脉冲放电（鱼类）相符，且信号较轻，富含持久性较低的三和四氯联苯。对数线性的PCB时间趋势与根据全球排放数据预测的高排放情景下的预计减少有很好的对比；对于受影响较小的沉积物芯，观察到了最佳拟合（排放情景为-2％.year（-1）对-3％.year）。对于污染更严重的沉降物质（-5％.year（-1）），尤其是鱼类，观察到更陡的坡度，其中在2001年多氯联苯脉冲后背景下降趋势增加了两倍（从-7％.year（-1）到-21％.year（-1））。这些来自对比地点的相关环境区室中的PCB时间趋势为评估南美南部控制措施的有效性提供了罕见的证据。

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