巯基坡缕石与锰化合物单一及复配处理对碱性镉污染土壤钝化修复效应  

Effect of single and combined application of sulfhydryl grafted palygorskite and manganese compounds on alkaline Cd contaminated soils

作　　者：景睿 狄雪荣 梁学峰 秦旭 彭云英 徐应明 黄青青 孙约兵 JING Rui;DI Xuerong;LIANG Xuefeng;QIN Xu;PENG Yunying;XU Yingming;HUANG Qingqing;SUN Yuebing(Key Laboratory of Original Agro-Environmental Pollution Prevention and Control,Ministry of Agriculture and Rural Affairs(MARA),Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety,Agro-Environmental Protection Institute,MARA,Tianjin 300191;College of Resources and Environment,Northeast Agricultural University,Harbin 150030)

机构地区：[1]农业农村部环境保护科研监测所,天津市农业环境与农产品安全重点实验室,农业农村部产地环境污染防控重点实验室,天津300191 [2]东北农业大学资源与环境学院,哈尔滨150030

出　　处：《环境科学学报》2024年第11期324-332,共9页Acta Scientiae Circumstantiae

基　　金：中国农业科学院科技创新工程项目(No.CAAS-CSGLCA-202302);国家自然科学基金项目(No.41601343)。

摘　　要：为探讨巯基坡缕石(SGP)和不同锰化合物单一及复配处理对碱性镉(Cd)污染土壤的钝化修复效应,选取某Cd污染碱性土为供试土壤,采用90 d土壤培养试验,研究了SGP和4种锰化合物(一氧化锰(MnO)、二氧化锰(MnO_(2))、氯化锰(MnCl_(2))、硫酸锰(MnSO_(4)))单一及复配处理对土壤Cd和Mn有效态、Cd形态以及土壤酶活性的影响.结果表明,所有钝化处理在培养第90 d时均显著降低了土壤DTPA-Cd提取态含量(p<0.05),降幅达13.29%~76.58%,其中,SGP和MnO复配处理对DTPA-Cd的降低效果最好,优于单一SGP处理;而土壤DTPA-Mn提取态含量较对照则显著提高了1.51~4.34倍(p<0.05)(单一SGP和MnO_(2)处理除外).土壤Cd形态分级提取结果显示,SGP单一处理及其与4种锰化合物复配处理均提高了土壤中碳酸盐结合态和铁锰氧化物结合态Cd分布,而单独锰化合物钝化处理则提高了土壤中锰氧化物结合态Cd分布.此外,SGP和锰化合物复配处理还提高了土壤酸性磷酸酯酶、多酚氧化酶和外切β-1,4-葡聚糖酶活性.综上,SGP和锰化合物复配处理在减少SGP的施用量下仍能对碱性Cd污染土壤保持高效钝化修复效应,而且还可以有效改善土壤环境质量.The objective of this study was to investigate the immobilization effects of the single and combination application of sulfhydryl-grafted palygorskite(SGP)and four manganese(Mn)compounds on cadmium(Cd)-contaminated alkaline soil.To the end,a 90-day soil incubation test was performed to investigate the effects of single and combination treatments of SGP with four manganese compounds(manganese monoxide(MnO),manganese dioxide(MnO_(2)),manganese chloride(MnCl_(2)),and manganese sulfate(MnSO_(4)))on soil Cd and Mn bioavailability,soil Cd fractions,as well as soil enzyme activities.Results showed that all treatments significantly decreased soil DTPA-Cd content,with reductions ranging from 13.29%to 76.58%at 90 days(p<0.05).The combination treatment of SGP and MnO had the best effect on reducing DTPA-Cd,which was superior to the single SGP treatment.Additionally,the soil DTPA-Mn content,with the exception of the single SGP and MnO_(2)treatments,was substantially elevated by 1.51~4.34 times(p<0.05)in comparison to the control.The distribution of soil Cd fractions showed that both the single SGP treatment and its combination with Mn compounds increased the proportion of Cd in carbonate-bound fractions and Fe-Mn oxide-bound fractions.Additionally,single Mn compound treatments increased the proportion of Cd in Mn oxide-bound fraction.Moreover,the combination of SGP and Mn compounds significantly increased the activities of soil acid phosphatase,polyphenol oxidase,and exonucleaseβ-1.4-glucanase.The current study demonstrated that combining SGP and Mn compounds can maintain high immobilization efficiency on Cd-contaminated alkaline soil under the condition of reduced application of SGP,and improve the quality of soil environment.

关 键 词：巯基坡缕石 锰化合物 镉 钝化修复 碱性土壤 酶活性 

分 类 号：X53[环境科学与工程—环境工程]