Abstract：
:The possible abiotic reduction of selenite to form elemental Se was studied under controlled conditions in the presence of ferrous iron. The reduction of selenite and formation of Se (0) was found to be a surface-mediated reaction by iron oxides. Without the presence of the reactive surface of freshly precipitated iron oxides, the reduction reaction could not be detected, even under a well controlled low oxygen environment (30 ppmv). Our results clearly illustrate the crucial role of iron oxide in this redox process. In lake sediments, the complex sediment matrix seems to strongly adsorb SeO(2-) and make it less available for reduction into Se(0). When lake sediments were submitted to UV irradiation to eliminate bacteria, the percentage of iron oxides increased and it was found that higher levels of iron oxides, generated by the UV treatment, correlated with the higher formation of Se(0). Moreover, the results of our field studies on two distinctively different lake sediments also showed a strong influence of iron oxides on the formation of elemental Se, which agrees well with our laboratory simulations.
journal_name
Chemospherejournal_title
Chemosphereauthors
Chen YW,Truong HY,Belzile Ndoi
10.1016/j.chemosphere.2008.10.043subject
Has Abstractpub_date
2009-02-01 00:00:00pages
1079-84issue
8eissn
0045-6535issn
1879-1298pii
S0045-6535(08)01356-8journal_volume
74pub_type
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