The combustion of alkyl-lead gasolines was the primary anthropogenic source of Pb in the second half of the twentieth century. Previously deposited Pb-aerosols enriched the organic matter and Fe-oxi-hydroxides phases of soils, which long after continue being transported downstream to be an important source of Pb into the ocean. Geochemical partition of Pb was determined in estuarine sediments of the Jamapa River, southern Gulf of Mexico, by the Tessier’s sequential extraction protocol. The residual fraction, conformed by siliciclastic particles, contain the highest proportion of Pb (8.6 μg/g = 70%), been the main source into the ocean. However, as the organic carbon and Fe,MnO(OH) fractions, together summed the 26% of total Pb in samples, so, it is assumed that previously deposited anthropogenic Pb, from alkyl-lead gasolines, still is an important source of this element, that is transported by the Jamapa River, enriching the coastal area.

在二十世纪下半叶，烷基铅汽油的燃烧是铅的主要人为来源。先前沉积的Pb气溶胶丰富了土壤的有机质和Fe-oxi-OHOHs相，这些相在很长一段时间后继续向下游输送，成为Pb进入海洋的重要来源。通过Tessier的连续萃取法确定了墨西哥湾南部贾马帕河河口沉积物中的Pb地球化学分配。残余部分由硅质碎屑构成，含有最高比例的铅（8.6μg/ g = 70％），是进入海洋的主要来源。但是，由于有机碳和Fe，MnO（OH）馏分合计占样品中总Pb的26％，因此，可以假定以前由人为沉淀的Pb是从烷基铅汽油中沉积的，