Τίτλος:
Assessing Mercury Mobility in Sediment of the Union Canal, Scotland, UK
by Sequential Extraction and Thermal Desorption
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
The mobility of mercury (Hg) was assessed in sediment from the Union
Canal, Scotland, UK. Samples collected from the vicinity of a former
munitions factory that manufactured mercury fulminate detonators were
subjected to sequential extraction followed by cold vapor atomic
absorption spectrometry (CVAAS) and direct analysis using thermal
desorption (TD). The sequential extraction indicated that >75% of
mercury (up to 429 mg kg(-1)) was in mobile forms, with <12% semimobile
and <23% nonmobile species. In the TD method, >67% of the total Hg
content was desorbed in the temperature range 100-250 degrees C
consistent with species weakly attached to the mineral matrix
[tentatively identified as an iron (oxy)hydroxide-associated species].
This predominance of mobile mercury species may arise from a lack of
association between Hg and either organic matter or sulfur in the
sediments. Further investigation of Hg mobilization, transport, and
assimilation/biomagnification is required both to determine whether
there is a need for remediation of the sediment and to improve
understanding of the biogeochemical cycling of Hg in shallow, oxic,
freshwater systems.
Συγγραφείς:
Cavoura, Olga
Davidson, Christine M.
Keenan, Helen E.
Reis,
Ana T.
Pereira, Eduarda
Περιοδικό:
Archives of Environmental Contamination and Toxicology
DOI:
10.1007/s00244-019-00615-y
