Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Iztacala, UBIPRO, Av. de los Barrios 1, Los Reyes Iztacala, Tlalnepantla, México 54090, Mexico.
Mar Pollut Bull. 2017 Mar 15;116(1-2):71-79. doi: 10.1016/j.marpolbul.2016.12.049. Epub 2016 Dec 29.
The fate of trace elements in reef depositional environments has not been extensively investigated. The aim of this study was to determine the partitioning of Pb in sediments of the Veracruz Reef System, and its relation to local environmental sources. Lead was determined in four geochemical fractions: exchangeable (3.8±0.4μgg), carbonate (57.0±13.6μgg), organic matter (2.0±0.9μgg), and mineral (17.5±5.4μgg). For the mineral fraction, lead concentrations were higher in those reefs influenced by river discharge or by long-distance transport of terrigenous sediments. The bioavailable concentration of lead (range: 21.9-85.6μgg) indicates that the Veracruz Reef System is a moderately polluted area. As expected, the carbonate fraction contained the highest proportion of Pb (70%), and because the reef framework is largely made up of by biogenic carbonate sediments, hence, it is therefore the most important repository of Pb in coral reef depositional environments.
微量元素在珊瑚礁沉积环境中的命运尚未得到广泛研究。本研究旨在确定韦拉克鲁斯礁系统沉积物中 Pb 的分配情况及其与当地环境源的关系。Pb 被确定为四个地球化学组分：可交换（3.8±0.4μg/g）、碳酸盐（57.0±13.6μg/g）、有机质（2.0±0.9μg/g）和矿物（17.5±5.4μg/g）。对于矿物相，受河流排放或远距离搬运陆源沉积物影响的珊瑚礁中 Pb 浓度更高。可利用的 Pb 浓度（范围：21.9-85.6μg/g）表明韦拉克鲁斯礁系统是一个中度污染的地区。正如预期的那样，碳酸盐相含有最高比例的 Pb（70%），并且由于珊瑚礁骨架主要由生物成因的碳酸盐沉积物组成，因此它是珊瑚礁沉积环境中 Pb 的最重要储存库。
