Universität zu Köln

Dalkmann, Philipp, Dresemann, Tim-Fabian, Siebe, Christina ORCID: 0000-0002-2636-6778, Mansfeldt, Tim, Amelung, Wulf ORCID: 0000-0002-4920-4667 and Siemens, Jan (2014). Release of Pharmaceuticals under Reducing Conditions in a Wastewater-Irrigated Mexican Soil. J. Environ. Qual., 43 (6). S. 1926 - 1933. MADISON: AMER SOC AGRONOMY. ISSN 1537-2537

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Abstract

Wastewater irrigation is often performed by flood irrigation, leading to changes in redox potential (Eh) of irrigated soils. In addition to soil organic matter, Fe-(hydr) oxides are important sorbents for pollutants, and biotransformation of pollutants can be accelerated under reducing conditions. Here, the influence of reducing conditions on the release of sorbed pharmaceuticals from soil and their potential accelerated dissipation was investigated in a microcosm study. Samples of a soil from the Mezquital Valley (Mexico) irrigated for 85 yr with untreated wastewater were incubated under oxidizing (Eh of 500 +/- 20 mV), weakly reducing (Eh of 100 +/- 20 mV), and moderately reducing (Eh of -100 +/- 20 mV) soil conditions for 30 to 31 d. The concentrations of nine pharmaceuticals (bezafibrate, carbamazepine, ciprofloxacin, sulfamethoxazole, trimethoprim, enrofloxacin, clarithromycin, diclofenac, and naproxen) were extracted via solid-phase extraction from soil slurries and analyzed by liquid chromatography-tandem mass spectrometry. Low Eh did not lead to a release of formerly sorbed pharmaceuticals from the wastewater irrigated soil. High pH values (> 8) of the examined soil resulting from denitrification under reducing conditions prevented the dissolution of Fe-(hydr) oxides and, hence, the potential release of pharmaceuticals. A trend of decreasing concentrations of sulfamethoxazole and bezafibrate with time under moderately reducing conditions supports previous findings of a transformation of these compounds under anaerobic conditions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dalkmann, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Dresemann, Tim-Fabian UNSPECIFIED UNSPECIFIED UNSPECIFIED Siebe, Christina UNSPECIFIED orcid.org/0000-0002-2636-6778 UNSPECIFIED Mansfeldt, Tim UNSPECIFIED UNSPECIFIED UNSPECIFIED Amelung, Wulf UNSPECIFIED orcid.org/0000-0002-4920-4667 UNSPECIFIED Siemens, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-425207
DOI:	10.2134/jeq2013.11.0475
Journal or Publication Title:	J. Environ. Qual.
Volume:	43
Number:	6
Page Range:	S. 1926 - 1933
Date:	2014
Publisher:	AMER SOC AGRONOMY
Place of Publication:	MADISON
ISSN:	1537-2537
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BANK FILTRATION; SORPTION; ANTIBIOTICS; SULFAMETHOXAZOLE; SULFADIAZINE; RESIDUES; FATE; PH; CIPROFLOXACIN; CONTAMINANTS Multiple languages Environmental Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42520