Zhang Di, Ding AiFang
Nanjing Xiaozhuang University, Nanjing, 210008, People's Republic of China.
Bull Environ Contam Toxicol. 2019 Jul;103(1):98-105. doi: 10.1007/s00128-019-02592-3. Epub 2019 Mar 21.
A 3-year pot experiment was carried out to investigate the efficiencies of hydroxyapatite (H), thiol-functionalized bentonite (T) and biochar (B) alone or in combination in remedying a Cd-Pb-contaminated soil. The application of passivating agents reduced the Cd and Pb mobility in acidic soil and enhanced soil microbial community function. The largest reductions in the Cd and Pb acid-soluble portions were observed under H (33.49%, 37.37%) and hydroxyapatite + thiol-functionalized bentonite + biochar (HTB, 36.70%, 37.31%), respectively. Biological analysis indicated that the AWCD (average well color development) of the B and HTB amendments was 1.42 and 1.51 times higher, respectively, than of untreated soil at 192 h. Moreover, the Shannon-Wiener, Simpson and Pielou indices were significantly increased in these two treatments relative to the values in the other amendment treatments. Therefore, combination amendments, such as HTB, which can reduce the bioavailability of both Cd and Pb and increase soil microbial activity, are recommended for practical applications.
进行了一项为期3年的盆栽试验，以研究单独或组合使用羟基磷灰石（H）、硫醇功能化膨润土（T）和生物炭（B）修复镉铅污染土壤的效率。钝化剂的施用降低了酸性土壤中镉和铅的迁移率，并增强了土壤微生物群落功能。在H处理（33.49%，37.37%）和羟基磷灰石+硫醇功能化膨润土+生物炭（HTB，36.70%，37.31%）处理下，分别观察到镉和铅酸溶部分的最大降幅。生物学分析表明，在192小时时，B和HTB改良剂的AWCD（平均孔颜色发展）分别比未处理土壤高1.42倍和1.51倍。此外，相对于其他改良剂处理的值，这两种处理的香农-维纳、辛普森和皮洛指数显著增加。因此，建议将HTB等组合改良剂用于实际应用，因为它们可以降低镉和铅的生物有效性并提高土壤微生物活性。
