Universität zu Köln

Hindersmann, Iris, Hippler, Joerg, Hirner, Alfred V. and Mansfeldt, Tim (2014). Mercury volatilization from a floodplain soil during a simulated flooding event. J. Soils Sediments, 14 (9). S. 1549 - 1559. HEIDELBERG: SPRINGER HEIDELBERG. ISSN 1614-7480

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Abstract

Middle-European floodplain soils are often contaminated with mercury (Hg) and periodically flooded. In this study, the influence of a flooding event and subsequent dewatering on the volatilization of elemental Hg and methylated species was investigated in a laboratory experiment. Undisturbed soil cores were taken from a topsoil (12.1 +/- 0.75 mg kg(-1) Hg) at the Elbe River in Lower Saxony, Germany. Soil columns were incubated at 20 A degrees C with varying soil moisture (water-saturated for 2 weeks, 95 and 90 % water content for 1 week each), and the redox potential (E-H) was recorded. The gaseous Hg that accumulated in the headspace of the flux chamber of the columns was pumped over cooled traps filled with adsorber material and analyzed by gas chromatography/inductively coupled plasma mass spectrometry for the various Hg species. The watering of the soil resulted in a rapid decrease in the E-H and the achievement of strongly reducing conditions (E-H < -100 mV). Mercury concentrations of the pore waters decreased continuously from 68.3 mu g L-1 Hg at the beginning to 5.78 mu g L-1 Hg at the end of the experiment. Species analyses revealed that exclusively elemental Hg volatilized. The volatilization rate was between 1.73 and 824 ng m(-2) h(-1) Hg, which is consistent with other studies at the Elbe River. Even when flooded for a longer period of time, floodplain soils should show neither emission of methylated Hg nor exceptionally high volatilization of elemental Hg.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hindersmann, Iris UNSPECIFIED UNSPECIFIED UNSPECIFIED Hippler, Joerg UNSPECIFIED UNSPECIFIED UNSPECIFIED Hirner, Alfred V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mansfeldt, Tim UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-430925
DOI:	10.1007/s11368-014-0908-2
Journal or Publication Title:	J. Soils Sediments
Volume:	14
Number:	9
Page Range:	S. 1549 - 1559
Date:	2014
Publisher:	SPRINGER HEIDELBERG
Place of Publication:	HEIDELBERG
ISSN:	1614-7480
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FRESH-WATER SEDIMENTS; CENTRAL ELBE RIVER; ELEMENTAL MERCURY; HUMIC SUBSTANCES; EMISSIONS; METHYLATION; SPECIATION; BIOAVAILABILITY; PHOTOREDUCTION; FRACTIONATION Multiple languages Environmental Sciences; Soil Science Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43092