Córdova Alejandro, Cabral-Tena Rafael Andrés, Horta-Puga Guillermo
Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, CDMX, Mexico.
UBIPRO, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla, Edo. de México, Mexico.
Bull Environ Contam Toxicol. 2020 Nov;105(5):764-769. doi: 10.1007/s00128-020-03017-2. Epub 2020 Oct 12.
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20世纪下半叶，烷基铅汽油的燃烧是铅的主要人为来源。先前沉积的铅气溶胶使土壤中的有机物和铁氧化氢氧化物相富集，这些物质在很长时间后仍会被输送到下游，成为海洋中铅的重要来源。通过Tessier连续提取法，对墨西哥湾南部贾马帕河河口沉积物中的铅进行了地球化学分配测定。由硅质碎屑颗粒组成的残余部分含铅比例最高（8.6μg/g = 70%），是进入海洋的主要来源。然而，由于有机碳和铁、锰的羟基氧化物部分加起来占样品中总铅的26%，所以可以认为，先前沉积的来自烷基铅汽油的人为铅仍然是该元素的重要来源，它由贾马帕河输送，使沿海地区富集。
