NDLI: Metal release from serpentine soils in Sri Lanka

Content Provider	Springer Nature Link
Author	Vithanage, Meththika Rajapaksha, Anushka Upamali Oze, Christopher Rajakaruna, Nishanta Dissanayake, C. B.
Copyright Year	2014
Abstract	Ultramafic rocks and their related soils (i.e., serpentine soils) are non-anthropogenic sources of metal contamination. Elevated concentrations of metals released from these soils into the surrounding areas and groundwater have ecological-, agricultural-, and human health-related consequences. Here we report the geochemistry of four different serpentine soil localities in Sri Lanka by coupling interpretations garnered from physicochemical properties and chemical extractions. Both Ni and Mn demonstrate appreciable release in water from the Ussangoda soils compared to the other three localities, with Ni and Mn metal release increasing with increasing ionic strengths at all sites. Sequential extraction experiments, utilized to identify “elemental pools,” indicate that Mn is mainly associated with oxides/(oxy)hydroxides, whereas Ni and Cr are bound in silicates and spinels. Nickel was the most bioavailable metal compared to Mn and Cr in all four soils, with the highest value observed in the Ussangoda soil at 168 ± 6.40 mg kg−1 via the 0.01-M CaCl2 extraction. Although Mn is dominantly bound in oxides/(oxy)hydroxides, Mn is widely dispersed with concentrations reaching as high as 391 mg kg−1 (Yudhaganawa) in the organic fraction and 49 mg kg−1 (Ussangoda) in the exchangeable fraction. Despite Cr being primarily retained in the residual fraction, the second largest pool of Cr was in the organic matter fraction (693 mg kg−1 in the Yudhaganawa soil). Overall, our results support that serpentine soils in Sri Lanka offer a highly labile source of metals to the critical zone.
Starting Page	3415
Ending Page	3429
Page Count	15
File Format	PDF
ISSN	01676369
Journal	Environmental Monitoring and Assessment
Volume Number	186
Issue Number	6
e-ISSN	15732959
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-01-26
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chemical extractions Natural attenuation Labile toxic metals Serpentine geoecology EPMA Environmental Monitoring/Analysis Environmental Management Ecotoxicology Atmospheric Protection/Air Quality Control/Air Pollution Ecology
Content Type	Text
Resource Type	Article
Subject	Pollution Medicine Management, Monitoring, Policy and Law

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