当前位置： SCI文献检索 > JOURNAL OF ENVIRONMENTAL RADIOACTIVITY期刊下所有文献 > Uranium and plutonium in anoxic marine sediments of the Santiago River mouth (Eastern Pacific, Mexico).

Uranium and plutonium in anoxic marine sediments of the Santiago River mouth (Eastern Pacific, Mexico).

Abstract：

:The uranium (U) and plutonium (Pu) content with depth in a sediment core collected in the continental shelf off the mouth of the Santiago River in the Mexican Pacific was studied to evaluate the contamination effects of the effluent of the Santiago-Lerma River as it moves into the sea. The large mass of terrestrial detritus delivered by the river influences the physicochemical and geochemical processes in the seafloor. Abnormal concentrations of U and Pu in sediments were examined as indicative of the effects of anoxic conditions. One of the indicators of pollution of seawater is the bacterial activity of the shallow seabed layer; and among the prevailing bacteria, the magnetotactic ones induce the formation of euhedral and framboidal shapes (pyrite). These pyrite entities are by-products of anoxic environments loaded with decomposing detrital material and are very abundant in the surface layers of the sediment core analyzed. The pyrite formation is the result of a biochemical reaction between iron and organic sulphur reduced by bacteria, and the pyrite entities precipitate to the seafloor. In the same upper zone of the profile, 238U is readily immobilized, while 234U is oxidized and dissolved in seawater by the effect of hot atom chemistry. This may cause the activity ratio (AR) 234U/238U disequilibrium (near 0.41). Furthermore, in the shallow layer of the sediment core, an abnormally high concentration of 239+240Pu was detected. In this upper layer, the activity concentrations found were 3.19 Bq kg-1 for 238U, 1.32 kg-1 for 234U and 2.78 Bq kg-1 for 239+240Pu. In the lower fractions of the sediment core, normal values of AR 234U/238U (≈1) were found, with traces of 239+240Pu.

journal_name

J Environ Radioact

journal_title

Journal of environmental radioactivity

authors

Almazán-Torres MG,Ordóñez-Regil E,Ruiz-Fernández AC

doi

10.1016/j.jenvrad.2016.08.007

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

395-399

eissn

0265-931X

issn

1879-1700

pii

S0265-931X(16)30296-X

journal_volume

164

pub_type

杂志文章

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