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| Effects of phosphoric-acid-modified biochar combined with chlorine on soil lead form and lead absorption in wheat |
| Received:January 12, 2018 |
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| KeyWord:modified biochar;wheat;lead contamination;stabilization |
| Author Name | Affiliation | E-mail | | ZHOU Zhi-yun | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | MA Wen-lian | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | ZHOU Zhen | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | MIAO Li-juan | Industrial Crops Research Institute, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China | | | ZHANG Biao | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | zhanbiao6136@163.com | | YANG Su-qin | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | yang_suqin@126.com |
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| Abstract: |
| Pot experiments were conducted to investigate the effects of phosphoric-acid-modified biochar combined with chlorine on the content of available lead and its various chemical forms in contaminated calcareous soil. Moreover, the distribution of Pb content in different parts of wheat(grain, glume, stem leaf, and root) was studied. The results showed that the content of available Pb in the soil decreased, although modified-biochar treatment(both 50 g·kg-1 and 100 g·kg-1) significantly decreased soil pH. With respect to the chemical forms of Pb in the soil, biochar treatment reduced the contents of acid-extractable and reducible Pb in the soil and increased those of oxidized and residual Pb. Moreover, the modified biochar combined with chlorine significantly reduced the Pb content in different parts of the wheat. This study confirmed that addition of chlorine can enhance the remediation efficiency of modified biochar for Pb-contaminated soil, decreasing the content of soil-available Pb. The remediation efficiency was better with CaCl2 addition. The Pb content of wheat grain decreased to 0.16 mg·kg-1 with treatment using high concentration of modified biochar combined with low CaCl2 concentration, which meets the "food hygiene standard" GB 2715-2016. |
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