NDLI: Toxicity of arsenic in relation to soil properties: implications to regulatory purposes

Content Provider	Springer Nature Link
Author	Romero Freire, Ana Sierra Aragón, Manuel Ortiz Bernad, Irene Martín Peinado, Francisco J.
Copyright Year	2014
Abstract	The present work evaluates the influence of different soil properties and constituents on As solubility in laboratory-contaminated soils, with the aim of assessing the toxicity of this element from the use of bioassays to evaluate the soil leachate toxicity and thereby propose soil guideline values for studies of environmental risk assessment in soil contamination.Seven soils with contrasting properties were artificially contaminated in laboratory with increasing concentrations of As. Samples were incubated for 4 weeks, and afterwards, soil solution (1:1) was obtained after shaking for 24 h. The soil leachate toxicity was assessed with two commonly used bioassays (seed germination test with Lactuca sativa and Microtox ® test with Vibrio fischeri).The relationship between soluble As and soil properties indicated that iron oxides and organic matter content were the variables most closely related to the reduction of the As solubility, while pH and CaCO$_{3}$ increased As solubility in the soil solutions. Toxicity bioassays showed significant differences between soils depending on their properties, with a reduction of the toxicity in the iron-rich soil (no observed effect concentration (NOEC) = 150 mg kg$^{−1}$) and a significant increase in the highly carbonate samples (NOEC between 15 and 25 mg kg$^{−1}$).Soil guideline values for regulatory purposes usually set a single value for large areas (regions or countries) which can produce over- or underestimation of efforts in soil remediation actions. These values should consider different levels according to the main soil properties controlling arsenic mobility and the soil leachate toxicity.
Starting Page	968
Ending Page	979
Page Count	12
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	14
Issue Number	5
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic EC50 Soil guideline values Soil properties Toxicity Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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