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Effect of mineral-based amendments on rice (Oryza sativa L.) growth and cadmium content in plant and Polluted soil

Effect of mineral-based amendments on rice (Oryza sativa L.) growth and cadmium content in plant and Polluted soil

Lei, Ming, Peng, Liang, Tie, Baiqing, Liao, Bohan, Hills, Colin D., Song, Zhengguo and Tang, Zhen (2017) Effect of mineral-based amendments on rice (Oryza sativa L.) growth and cadmium content in plant and Polluted soil. Environmental Engineering Science. ISSN 1092-8758 (Print), 1557-9018 (Online) (doi:10.1089/ees.2016.0328)

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Abstract

Agricultural soils can be contaminated by industrial activities such as mining and smelting. Contamination with cadmium (Cd) can significantly exceed average background values, which can lead to uptake by rice plant and even harm to humans through food chain. In Hunan province, southern China, rice (Oryza sativa L.) is the main cereal, and human exposure to metallic contaminants through rice pathway is of particular interest. Shortage of land for rice growing means that contaminated agricultural soil is still cultivated for rice in Hunan. In the present work, a field experiment was undertaken to remediate Cd-contaminated paddy soil with three mineral amendments, namely sepiolite, bone char, and a silicon-based product (normally used as fertilizer). Average Cd concentration in the paddy soil was 2.85 mg/kg, significantly exceeding Chinese soil quality standards of China. Cd content was 0.59 mg/kg in sepiolite, 0.28 mg/kg in bone char, and 0.44 mg/kg in silicon fertilizer, respectively. Distribution fractions of Cd in soil followed the order of exchangeable (FI) > organic matter-bound (FIII) > residual (FIV) > oxide-bound (FII) without treatment, while exchangeable (FI) > residual (FIV) > organic matter-bound (FIII) > oxide-bound (FII) after treatment. With addition of three amendments, soil pH values and rice growth such as plant height and ripening rate increased. Concentrations of Cd in the rice plant (straw, husk, and unpolished rice) decreased after treatment. However, among three amendments, only the bone char addition reduced Cd accumulation in the rice plant below the Chinese standard value (0.2 mg/kg) and in the husk to below the Chinese feed hygiene standard for food (0.5 mg/kg).

Item Type: Article
Uncontrolled Keywords: Bone char; Cadmium; Farmland; Rice; Sepiolite; Silicon fertilizer
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Engineering Science
Last Modified: 06 Nov 2017 17:21
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/17526

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