College of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China.
College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
Bull Environ Contam Toxicol. 2020 Jul;105(1):146-154. doi: 10.1007/s00128-020-02886-x. Epub 2020 Jun 1.
Biochar was for the first time produced from Suaeda glauca. The immobilization of Pb and Cd by this biochar and pig manure biochar was examined in two types of soils by diethylene triamine pentaacetic acid (DTPA) extraction. Addition of biochars decreased DTPA extractable Pb and Cd in Fluvo-aquic soil with reduction rates being 11.3%-48.4% and 0.74%-64.9% compared with the control treatment. The pig manure biochar favored the immobilization of Pb and S. glauca biochar favored the immobilization of Cd. Biochars can effectively immobilize heavy metals in Fluvo-aquic soil. However, the addition of biochars increased extractable Pb and Cd in red soil, with pig manure biochars showing greater rates. This is ascribed to that the competition effects of ions released from biochar enhanced the moving of heavy metals from iron and manganese oxides bound form to organic matter bound form, and hence enhanced the mobility and bioavailability of heavy metals.
首次利用滨海盐地碱蓬制备生物炭，采用二乙烯三胺五乙酸（DTPA）提取法研究了该生物炭和猪粪生物炭对两种土壤中 Pb 和 Cd 的固定作用。与对照处理相比，生物炭的添加降低了潮土中 DTPA 可提取的 Pb 和 Cd，降低率分别为 11.3%-48.4%和 0.74%-64.9%。猪粪生物炭有利于 Pb 的固定，而滨海盐地碱蓬生物炭有利于 Cd 的固定。生物炭可有效固定潮土中的重金属。然而，生物炭的添加增加了红壤中可提取的 Pb 和 Cd，猪粪生物炭的增加率更高。这归因于生物炭释放的离子的竞争效应增强了重金属从铁锰氧化物结合态向有机质结合态的迁移，从而增强了重金属的迁移性和生物有效性。
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