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Open AccessArticle

Combined Effect of Ferrous Ion and Biochar on Cadmium and Arsenic Accumulation in Rice

1
College of Life Science and Technology GuangXi University, Nanning 530004, China
2
College of Resources, Environment and Materials GuangXi University, Nanning 530004, China
3
Guangxi Zhuang Autonomous Region Environmental Monitoring Central Station, Nanning 530004, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(1), 300; https://doi.org/10.3390/app10010300
Received: 4 December 2019 / Revised: 26 December 2019 / Accepted: 27 December 2019 / Published: 31 December 2019
Excessive accumulation of cadmium (Cd) and arsenic (As) in rice (Oryza sativa L.) poses a potential health risk to populations. Cd and As exhibit opposite geochemical behavior in paddy soil, using appropriate remediation materials to reduce their migration and inhibit their uptake by rice is a great challenge. A pot culture experiment was conducted to investigate the effects of application of silkworm excrement biochar (BC) and ferrous sulfate (Fe(II)) on available Cd and As in paddy soils and their uptake by rice. Results showed that the application of BC + Fe significantly accelerated the tillering of rice plants, and the addition of BC alone to soil did not have a significant effect on the pH of soil, while applied 1% (w/w) BC and 1% (w/w) Fe(II) (1BC-1 Fe(II)) treatment could markedly reduce the soil pH. BC+Fe(II) could reduce the content of available Cd (reduced by 10%–23%) and As (reduced by 6%–33%) in soil. BC+Fe(II) has a distinct decreasing effect on the available As, thus inhibiting As uptake in rice tissues, and the effect was more obvious with an increasing mass ratio of Fe in BC+Fe(II) treatment. BC+Fe(II) decreased bioaccumulation factors (BF) of As compared to control and BC alone treatments. Compared with As, Cd was more readily transferred from the root to the shoot and accumulated in rice eventually. These findings provide a safe and reliable remediation strategy though application of BC+Fe(II) in Cd and As co-contaminated soil. However, the improvement effect of amendments should be paid a special attention on soil pH. View Full-Text
Keywords: silkworm excrement biochar; heavy metal; paddy soil; phytoavailability silkworm excrement biochar; heavy metal; paddy soil; phytoavailability
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MDPI and ACS Style

Rong, Q.; Zhong, K.; Li, F.; Huang, H.; Li, C.; Nong, X.; Zhang, C. Combined Effect of Ferrous Ion and Biochar on Cadmium and Arsenic Accumulation in Rice. Appl. Sci. 2020, 10, 300. https://doi.org/10.3390/app10010300

AMA Style

Rong Q, Zhong K, Li F, Huang H, Li C, Nong X, Zhang C. Combined Effect of Ferrous Ion and Biochar on Cadmium and Arsenic Accumulation in Rice. Applied Sciences. 2020; 10(1):300. https://doi.org/10.3390/app10010300

Chicago/Turabian Style

Rong, Qun; Zhong, Kai; Li, Fangyuan; Huang, He; Li, Chuanzhang; Nong, Xinyu; Zhang, Chaolan. 2020. "Combined Effect of Ferrous Ion and Biochar on Cadmium and Arsenic Accumulation in Rice" Appl. Sci. 10, no. 1: 300. https://doi.org/10.3390/app10010300

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