Díaz-Asencio M, Alonso-Hernández C M, Bolanos-Alvarez Y, Gómez-Batista M, Pinto V, Morabito R, Hernández-Albernas J I, Eriksson M, Sanchez-Cabeza J A
Centro de Estudio Ambientales de Cienfuegos, Cienfuegos, Cuba.
Mar Pollut Bull. 2009;59(4-7):108-15. doi: 10.1016/j.marpolbul.2009.02.010. Epub 2009 Mar 31.
The vertical distribution of Hg and Pb were determined in a sediment core collected from the Sagua estuary (North Cuba) that receives input from the Sagua river, one of the most polluted rivers discharging into the Cuban coastal environment. Depth profiles of metal concentrations were converted to time-based profiles using the (210)Pb dating method and confirmed with the (137)Cs fallout peak. The mean mass accumulation rate was estimated to be 0.17+/-0.04 g cm(-2)y(-1) (mean sediment accumulation rate 0.52+/-0.13 cm y(-1)) and the core bottom was estimated to date back about 130 years. The historical sedimentary record showed a strong enrichment of mercury concentrations in the past decades, caused by the incomplete treatment of industrial wastes from a chlor-alkali plant with mercury-cell technology in the Sagua river basin. Lead fluxes to sediments showed a gradual increase from the 1920s to present, which agrees with a population increase in Sagua la Grande City. Fluxes of both metals have increased the past 25 years, with values reaching a maximum of 0.5 and 3.9 microg cm(-2)y(-1) for Hg and Pb, respectively.
对从萨瓜河口（古巴北部）采集的一根沉积岩芯中的汞和铅的垂直分布情况进行了测定，该河口接收萨瓜河的河水注入，萨瓜河是流入古巴沿海环境的污染最严重的河流之一。利用²¹⁰Pb测年法将金属浓度的深度剖面转换为基于时间的剖面，并通过¹³⁷Cs沉降峰值进行了确认。估计平均质量累积速率为0.17±0.04 g cm⁻² y⁻¹（平均沉积物累积速率为0.52±0.13 cm y⁻¹），岩芯底部估计可追溯到约130年前。历史沉积记录显示，在过去几十年中汞浓度大幅富集，这是由萨瓜河流域一家采用汞电池技术的氯碱厂工业废物处理不完全所致。沉积物中的铅通量从20世纪20年代到现在呈逐渐增加趋势，这与大萨瓜市的人口增长情况相符。在过去25年中，两种金属的通量均有所增加，汞和铅的通量分别达到最大值0.5和3.9 μg cm⁻² y⁻¹。
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