零价纳米铁对青梗菜吸收土壤铬的抑制效果探讨
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摘要
通过盆栽实验探讨不同铬污染水平农田土壤施加零价纳米铁对不同时期青梗菜吸收土壤铬的抑制效果。结果表明,零价纳米铁能够有效抑制青梗菜对铬的富集,且在施加铬铁质量比例为1∶20和1∶40时效果较好,与对照相比,青梗菜根、茎、叶铬含量最高减少量分别为66%、79%、78%。同一污染土壤,不同采集时期青梗菜体内铬含量无显著差异。青梗菜体内富集的铬含量与土壤总铬含量呈正相关,青梗菜对铬富集量呈现根部>茎部>叶部。
The inhibitory effects on Cr absorption by bok choy( Brassica rapa L. ssp. Chinensis L.) were studied by pot experiments and adding nanoscale zero-valent iron( nZVI) to different levels of chromium( Cr)contaminated soil. The results showed that nZVI could effectively reduce Cr accumulation in bok choy,the optimal additive ratio of nZVI were 1∶ 20 and 1∶ 40. Compared to the control group,the concentration of Cr in root,stem and leaf reduced by 66%,79%,78%,respectively. In the same contaminated soil,no significant difference of Cr absorption was found in different growth period of bok choy. The accumulation of Cr in bok choy was positively correlated with the total concentration of Cr in the soil. The sequence of Cr concentration in bok choy from high to low was root,stem and leaf.
The inhibitory effects on Cr absorption by bok choy( Brassica rapa L. ssp. Chinensis L.) were studied by pot experiments and adding nanoscale zero-valent iron( nZVI) to different levels of chromium( Cr)contaminated soil. The results showed that nZVI could effectively reduce Cr accumulation in bok choy,the optimal additive ratio of nZVI were 1∶ 20 and 1∶ 40. Compared to the control group,the concentration of Cr in root,stem and leaf reduced by 66%,79%,78%,respectively. In the same contaminated soil,no significant difference of Cr absorption was found in different growth period of bok choy. The accumulation of Cr in bok choy was positively correlated with the total concentration of Cr in the soil. The sequence of Cr concentration in bok choy from high to low was root,stem and leaf.
引文
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[2]翁炳霖.农田土壤重金属污染监测及其空间估值方法研究[J].农业与技术,2017,37(2):31.
[3]陈永,黄标,胡文友,等.设施蔬菜生产系统重金属积累特征及生态效应[J].土壤学报,2013,50(4):693-702.
[4]孙鹏轩.土壤重金属污染修复技术及其研究进展[J].环境保护与循环经济,2012,32(11):48-51.
[5]师荣光,郑向群,龚琼,等.农产品产地土壤重金属外源污染来源解析及防控策略研究[J].环境监测管理与技术,2017,29(4):9-13.
[6]张厚坚,王兴润,陈春云,等.典型铬渣污染场地健康风险评价及修复指导限值[J].环境科学学报,2010,30(7):1445-1450.
[7]刘玉强,李丽,王琪,等.典型铬渣污染场地的污染状况与综合整治对策[J].环境科学研究,2009,22(2):249-253.
[8]赵乾程,杨欣,曹田,等.土壤重金属污染原位钝化修复及效果评价进展研究[J].环境科学与管理,2016,41(12):98-102.
[9] WANG Y L,LIN D H. The interaction between nano zero-valent iron and soil components and its environmental implication[J].Progress in Chemistry,2017,29(9):1072-1081.
[10] DU J,LU J,WU Q,et al. Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zerovalent iron[J]. Journal of Hazardous Materials,2012,215-216(1):152-158.
[11] FRANCO D V,SILVA L M D,JARDIM W F. Reduction of hexavalent chromium in soil and ground water using zero-valent iron under batch and semi-batch conditions[J]. Water Air&Soil Pollution,2009,197(1-4):49-60.
[12] SINGH R,MISRAV,SINGH R P. Synthesis,characterization and role of zero-valent iron nanoparticle in removal of hexavalent chromium from chromium-spiked soil[J]. Journal of Nanoparticle Research,2011,13(9):4063-4073.
[13] PALNA L D,GUEYE M T,PETRUCCI E. Hexavalent chromium reduction in contaminated soil:A comparison between ferrous sulphate and nanoscale zero-valent iron[J]. Journal of Hazardous Materials,2015,281:70-76.
[14]董军,任黎明,迟子芳,等.氧化石墨烯负载纳米零价铁(r GO-nZVI)去除地下水中Cr(Ⅵ)的XPS谱学表征[J].光谱学与光谱分析,2017,37(1):250-255.
[15]李朝阳,杨胜香,陈玲,等.纳米材料改良土壤对小白菜吸收和富集重金属的影响[J].湖南农业科学,2010(23):57-62.
[16]张悦.果胶包覆的纳米零价铁作用下土壤中Cr(Ⅵ)的去除和迁移规律的研究[D].太原:太原理工大学,2016.
[17] LV X,XU J,JIANG G,et al. Removal of chromium(Ⅵ)from wastewater by nanoscale zero-valent iron particles supported on multiwalled carbon nanotubes[J]. Chemosphere,2011,85(7):1204-1209.
[18] WANG Y,FANG Z,KANG Y,et al. Immobilization and phytotoxicity of chromium in contaminated soil remediated by CMC-stabilized nZVI[J]. Journal of Hazardous Materials,2014,275(2):230-237.
[19]葛云思,陈冉,徐启新.土壤中铁氧化物对铅吸附-解吸的影响[J].环境监测管理与技术,2016,28(6):60-63.
[20]林琦.重金属污染土壤植物修复的根际机理[D].杭州:浙江大学,2002.
[21]赵艺,赵保卫.土壤污染对植物根系生长影响的研究进展[J].环境科学与管理,2008,33(6):13-15.
[22]卢玲丽.超积累植物东南景天(Sedum Alfredii Hance)对镉的吸收及转运机制研究[D].杭州:浙江大学,2009.
[23] SU H,FANG Z,TSANG P E,et al. Stabilisation of nanoscale zerovalent iron with biochar for enhanced transport and in-situ remediation of hexavalent chromium in soil[J]. Environmental Pollution,2016,214:94-100.