Geochemical associations and availability of cadmium (Cd) in a paddy field system, northwestern Thailand

Kosolsaksakul, Peerapat; Farmer, John G.; Oliver, Ian W.; Graham, Margaret C.

Abstract

The Mae Tao watershed, northwest Thailand, has become contaminated with cadmium (Cd) as a result of zinc ore extraction (Padaeng deposit) in the nearby Thanon-Thongchai mountains. Consumption of contaminated rice has led to documented human health impacts. The aim of this study was to elucidate transfer pathways from creek and canal waters to the paddy field soils near Baan Mae Tao Mai village and to determine the relationship between Cd speciation in the soil and uptake by rice plants. Transfer mainly occurred in association with particulate matter during flooding and channel dredging and, in contrast with many other studies, most of the soil Cd was associated with exchangeable and carbonate-bound fractions. Moreover, there was a linear relationship between soil total Cd and rice grain Cd (R2 = 0.715), but a stronger relationship between both the Tessier-exchangeable soil Cd and the BCR-exchangeable soil Cd and rice grain Cd (R2 = 0.898 and 0.862, respectively).

• Journal Article Type: Article
• Acceptance Date: Jan 6, 2014
• Online Publication Date: Feb 3, 2014
• Publication Date: 2014-04
• Deposit Date: Jun 1, 2023
• Journal: Environmental Pollution
• Print ISSN: 0269-7491
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 187
• Pages: 153-161
• DOI: https://doi.org/10.1016/j.envpol.2014.01.006
• Keywords: Health, Toxicology and Mutagenesis; Pollution; Toxicology; General Medicine
• Additional Information: This article is maintained by: Elsevier; Article Title: Geochemical associations and availability of cadmium (Cd) in a paddy field system, northwestern Thailand; Journal Title: Environmental Pollution; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.envpol.2014.01.006; Content Type: article; Copyright: Copyright © 2014 Elsevier Ltd. All rights reserved.