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Open-pit coal-mining effects on rice paddy soil composition and metal bioavailability to Oryza sativa L. plants in Cam Pha, northeastern Vietnam

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Abstract

This study quantified Cd, Pb, and Cu content, and the soil–plant transfer factors of these elements in rice paddies within Cam Pha, Quang Ninh province, northeastern Vietnam. The rice paddies are located at a distance of 2 km from the large Coc Sau open-pit coal mine. Electron microprobe analysis combined with backscattered electron imaging and energy-dispersive spectroscopy revealed a relatively high proportion of carbon particles rimmed by an iron sulfide mineral (probably pyrite) in the quartz–clay matrix of rice paddy soils at 20–30 cm depth. Bulk chemical analysis of these soils revealed the presence of Cd, Cu, and Pb at concentrations of 0.146 ± 0.004, 23.3 ± 0.1, and 23.5 ± 0.1 mg/kg which exceeded calculated background concentrations of 0.006 ± 0.004, 1.9 ± 0.5, and 2.4 ± 1.5 mg/kg respectively at one of the sites. Metals and metalloids in Cam Pha rice paddy soils, including As, Cd, Cr, Cu, Hg, Mn, Ni, Pb, and Zn, were found in concentrations ranging from 0.2 ± 0.1 to 140 ± 3 mg/kg, which were in close agreement with toxic metal contents in mine tailings and Coc Sau coal samples, suggesting mining operations as a major cause of paddy soil contamination. Native and model Oryza sativa L. rice plants were grown in the laboratory in a growth medium to which up to 1.5 mg/kg of paddy soil from Cam Pha was added to investigate the effects on plant growth. A decrease in growth by up to 60 % with respect to a control sample was found for model plants, whereas a decrease of only 10 % was observed for native (Nep cai hoa vang variety) rice plants. This result suggests an adaptation of native Cam Pha rice plants to toxic metals in the agricultural lands. The Cd, Cu, and Pb contents of the native rice plants from Cam Pha paddies exceeded permitted levels in foods. Cadmium and Pb were highest in the rice plant roots with concentrations of 0.84 ± 0.02 and 7.7 ± 0.3 mg/kg, suggesting an intake of these metals into the rice plant as shown, for example, by Cd and Pb concentrations of 0.09 ± 0.01 and 0.10 ± 0.04 mg/kg respectively in the rice grain endosperm. The adaptation of native rice plants, combined with bioaccumulation ratios of 1 ± 0.6 to 1.4 ± 0.7 calculated for Cd transfer to the rice grain endosperm, and maximum Cd transfer factors of 4.3 ± 2.1 to the plant roots, strongly suggest a continuous input of some toxic metals from coal-mining operations to agricultural lands in the region of Cam Pha. In addition, our results imply a sustained absorption of metals by native rice plant varieties, which may lead to metal accumulation (e.g., Cd) in human organs and in turn to severe disease.

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Acknowledgments

The authors would like to thank Dr. Giampiero Valé of the Consiglio per la Ricerca e la Sperimentazione in Agricoltura—Unità di Ricerca per la Risicoltura in Vercelli, Italy, for kindly providing model O. sativa L. whole rice grain varieties. The authors would further like to thank Dr. Hiltrud Müller-Sigmund for EMP analysis of soil samples and Ms. Sigrid Hirth-Walther, of the Institute of Earth and Environmental Sciences, for analysis of soil and plant biomass samples with for AAS and IC. In addition, the authors acknowledge Prof. Dr. Kurt Bucher and the Institute of Earth and Environmental Sciences, at the University of Freiburg for providing research funding for this project to RM. This work was also made possible through a M. Sc. DAAD/CONACYT Scholarship to JEM, and a grant to TBHH from the Ministry of Education and Training Vietnam.

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  1. Institut für Geo- und Umweltnaturwissenschaften, Albert-Ludwigs-Universität, Albertstraße 23b, 79104, Freiburg, Germany

    Raul E. Martinez, J. Eduardo Marquez, Hoàng Thị Bích Hòa & Reto Gieré

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Martinez, R.E., Marquez, J.E., Hòa, H.T.B. et al. Open-pit coal-mining effects on rice paddy soil composition and metal bioavailability to Oryza sativa L. plants in Cam Pha, northeastern Vietnam. Environ Sci Pollut Res 20, 7686–7698 (2013). https://doi.org/10.1007/s11356-013-2030-1

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