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| Effects of sodium silicate and humic fertilizer on the speciation of cadmium in soil and the bioaccessibility of cadmium in Lactuca sativa L. |
| Received:February 14, 2022 |
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| KeyWord:sodium silicate;humic fertilizer;bioaccessibility;health risk;cadmium |
| Author Name | Affiliation | E-mail | | HUANG Ling | South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510535, China
School of Horticulture and Landscape Architecture, Yangtze University, Jingzhou 434025, China
Guangdong Province Engineering Research Center for Treatment and Remediation of Heavy Metal Contaminated Farmland Soil, Guangzhou 510535, China | | | ZHOU Cunyu | School of Horticulture and Landscape Architecture, Yangtze University, Jingzhou 434025, China | | | ZHANG Jianqiang | South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510535, China
Guangdong Province Engineering Research Center for Treatment and Remediation of Heavy Metal Contaminated Farmland Soil, Guangzhou 510535, China | | | SUN Mengqiang | South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510535, China
Guangdong Province Engineering Research Center for Treatment and Remediation of Heavy Metal Contaminated Farmland Soil, Guangzhou 510535, China | | | ZOU Qi | South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510535, China
Guangdong Province Engineering Research Center for Treatment and Remediation of Heavy Metal Contaminated Farmland Soil, Guangzhou 510535, China | | | WEI Hang | South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510535, China
Guangdong Province Engineering Research Center for Treatment and Remediation of Heavy Metal Contaminated Farmland Soil, Guangzhou 510535, China | | | CHEN Zhiliang | South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510535, China
Guangdong Province Engineering Research Center for Treatment and Remediation of Heavy Metal Contaminated Farmland Soil, Guangzhou 510535, China | chenzhiliang@scies.org |
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| Abstract: |
| In situ immobilization technology is a research hotspot in the remediation of heavy metal pollution on farmland. However, the variations in heavy metal bioaccessibility and the health risks of amended soils are largely unknown. In this study, two soil amendments, sodium silicate and humic fertilizer, were selected to study the effects of single and combined amendments on the physicochemical properties and speciation of cadmium in soil, biomass, cadmium uptake, and cadmium bioaccessibility in lettuce in a pot experiment. The results showed that single application of sodium silicate inhibited the growth of lettuce, while humic fertilizer promoted growth. The combined application of 0.6% humic fertilizer and 0.3% sodium silicate had the optimum effect on promoting the growth of lettuce and reducing its accumulation of Cd. Under different treatments, the bioavailability of lettuce Cd in the stomach stage was higher than in the small intestine stage. Compared with the control, each treatment could reduce the intake of Cd in children and adults, but the bioaccessibility of Cd in adults at different digestion stages was higher than that in children. Single and combined amendments could effectively reduce the carcinogenic risk and non-carcinogenic risk of Cd in lettuce. Under the combined amendment treatment of 0.6% humic fertilizer and 0.3% sodium silicate, the health risks of lettuce Cd to children and adults were decreased by 40.82% and 30.21%, respectively. Dietary intake of lettuce with different treatments is less likely to cause non-carcinogenic harm to the human body, but it may still present potential carcinogenic risk to children. |
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