Yuan Feng, Tang Xian-Jin, Wu Ji-Zi, Zhao Ke-Li, Ye Zheng-Qian
Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Lin'an 311300, China.
College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an 311300, China.
Huan Jing Ke Xue. 2021 Jul 8;42(7):3535-3548. doi: 10.13227/j.hjkx.202010183.
Two iron-based materials, Fe-Ca composite (FeCa) and Fe-Mn binary oxide (FMBO), were applied to immobilize As, Pb, and Cd in heavy metal contaminated paddy soils. Seven kinds of paddy soil (tidal soil) contaminated by arsenic, lead and cadmium were collected from Shangyu, Shaoxing (SY), Foshan, Guangdong (FS), Shaoguan, Guangdong (SG), LiuYang, Hunan (LY), Ganzhou, Jiangxi (GZ), Dushan, Guizhou (DS), and Ma'anshan, Anhui (MAS). The effects of iron-based materials on the dynamic changes of As, Pb, and Cd concentration in soil solution, the stabilization efficacy of available As, Pb, and Cd in soil, and the effects of soil types and properties on stabilization efficacy were studied through soil incubation experiment. The results showed that the content of soil dissolved As, Pb, and Cd were lower in iron-based material treatments than in control throughout the incubation. The addition of two iron-based materials significantly reduced the availability of Cd, Pb, and As. Moreover, the stabilization efficiency of FeCa for As was higher than FMBO, but no significant difference was found in the stabilization efficiency of Pb and Cd between two materials. The stabilization efficiency of As, Pb, and Cd in FeCa treatments could be ordered as GZ > SG > DS and MAS; FS>SY, LY, and SG>MAS; SY, GZ, and DS>MAS, respectively. While the stabilization efficiency for As, Pb, and Cd in FMBO could be ordered as SY, LY, and GZ > DS > FS; FS > GZ > SY; DS > LY > MAS, respectively. In addition, the statistical results showed that the stabilization efficiencies of various soils under the treatment of iron-based materials were significantly correlated with sand content (negatively correlated for As), soil pH (positively correlated for Pb), and clay content (negatively correlated for Cd). In conclusion, the two iron-based materials evaluated in this study may be effective stabilization agents for remediating different types of arsenic-, lead-, and cadmium-contaminated soils.
采用两种铁基材料，即铁 - 钙复合材料（FeCa）和铁 - 锰二元氧化物（FMBO），对重金属污染稻田土壤中的砷、铅和镉进行固定。从绍兴上虞（SY）、广东佛山（FS）、广东韶关（SG）、湖南浏阳（LY）、江西赣州（GZ）、贵州独山（DS）和安徽马鞍山（MAS）采集了7种受砷、铅和镉污染的水稻土（潮土）。通过土壤培养试验，研究了铁基材料对土壤溶液中砷、铅和镉浓度动态变化的影响、土壤中有效态砷、铅和镉的稳定化效果以及土壤类型和性质对稳定化效果的影响。结果表明，在整个培养过程中，铁基材料处理的土壤中溶解态砷、铅和镉的含量均低于对照。两种铁基材料的添加显著降低了镉、铅和砷的有效性。此外，FeCa对砷的稳定化效率高于FMBO，但两种材料对铅和镉的稳定化效率无显著差异。FeCa处理中砷、铅和镉的稳定化效率顺序分别为GZ > SG > DS和MAS；FS>SY、LY和SG>MAS；SY、GZ和DS>MAS。而FMBO中砷、铅和镉的稳定化效率顺序分别为SY、LY和GZ > DS > FS；FS > GZ > SY；DS > LY > MAS。此外，统计结果表明，铁基材料处理下各土壤的稳定化效率与砂含量（砷呈负相关）、土壤pH（铅呈正相关）和粘粒含量（镉呈负相关）显著相关。总之，本研究中评估的两种铁基材料可能是修复不同类型砷、铅和镉污染土壤的有效稳定剂。
