CAJ | 학술논문

为探讨不同改性明矾浆能否作为修复中、低度Cd和Pb污染土壤的重金属钝化剂，采用土培实验研究了不同改性明矾浆和系列添加浓度对污染土壤中可提取态Cd和Pb含量的影响。结果表明：土壤中可提取态Cd和Pb的含量随明矾浆添加量的增大和钝化时间的延长而降低，其中同等钝化剂添加量条件下，热碱改性明矾浆钝化土壤中Cd和Pb的能力优于其他三种明矾浆，如添加浓度为5.0%，放置时间为16周的热碱改性明矾浆处理，其可提取态Cd和Pb含量分别为1.04、19.87 mg·kg-1，与对照相比（可提取态Cd和Pb含量分别为2.12、50.8 mg·kg-1），降幅分别为51%和60.9%，均达到显著水平（P﹤0.05）。扫描电镜和比表面积测试结果证实，原明矾浆经过热碱改性后其粒径变小，比表面积增大，增加了明矾浆与污染物的接触面积，使其与重金属的吸附固定能力有所提高，可以有效降低土壤中重金属Cd和Pb的可提取态含量，从而降低其生物有效性。
위탐토불동개성명반장능부작위수복중、저도Cd화Pb오염토양적중금속둔화제，채용토배실험연구료불동개성명반장화계렬첨가농도대오염토양중가제취태Cd화Pb함량적영향。결과표명：토양중가제취태Cd화Pb적함량수명반장첨가량적증대화둔화시간적연장이강저，기중동등둔화제첨가량조건하，열감개성명반장둔화토양중Cd화Pb적능력우우기타삼충명반장，여첨가농도위5.0%，방치시간위16주적열감개성명반장처리，기가제취태Cd화Pb함량분별위1.04、19.87 mg·kg-1，여대조상비（가제취태Cd화Pb함량분별위2.12、50.8 mg·kg-1），강폭분별위51%화60.9%，균체도현저수평（P﹤0.05）。소묘전경화비표면적측시결과증실，원명반장경과열감개성후기립경변소，비표면적증대，증가료명반장여오염물적접촉면적，사기여중금속적흡부고정능력유소제고，가이유효강저토양중중금속Cd화Pb적가제취태함량，종이강저기생물유효성。
Alum powder has fine size, large surface area and strong adsorption, and could be used to reduce heavy metal concentrations in soil solution. Here alum powder, hot acid alum powder, hot alkali alum powder and thiol modified alum powder were applied to cadmium (Cd)and lead(Pb)contaminated soils to assess their efficiency in immobilization of soil Cd and Pb. Application of all alum powder de-creased extractability of Cd and Pb in soils. Extractable Cd and Pb were negatively correlated with the amounts of alum powder and incuba-tion time. Hot alkali alum powder was the most effective in decreasing extractable Cd and Pb in soil. Scanning electron microscopy showed that hot alkali alum powder had smaller particle sizes and greater specific surface area than the original one did. The results of this study would be of practical importance in screening amendments for remediation of Cd and Pb contaminated soil.