螯合剂对油葵修复镉砷复合污染土壤的影响   总被引：5，自引：0，他引：5  

韩廿  黄益宗  魏祥东  铁柏清  张盛楠  王丙烁  保琼莉  黄永春 《农业环境科学学报》2019,38(8):1891-1900

为提高油葵对农田土壤重金属的提取效率,研究了不同螯合剂(NTA、EGTA、EDDS和EDTA)对油葵修复Cd、As复合污染农田土壤的影响。结果表明,施用4种不同螯合剂对油葵根、茎、叶、花盘和籽粒生物量影响不大。不同螯合剂对油葵各器官Cd、As含量和积累量影响不一样。与CK处理相比,施用NTA、EGTA、EDDS、EDTA导致油葵花盘Cd含量分别提高30.2%、55.1%、41.9%和43.3%,根系As含量分别提高23.6%、18.1%、15.6%和15.4%,但是对籽粒和茎中Cd含量影响不显著。施用NTA、EGTA、EDDS和EDTA处理使油葵植株总Cd积累量分别比CK处理提高32.8%、45.3%、40.5%和41.6%,而对油葵As积累量没有显著影响。4种螯合剂对油葵各器官Cd、As富集系数有不同影响,而对Cd、As转运系数影响不显著。施用EDTA处理使根际土壤Cd含量比CK处理降低25.0%,施用NTA和EDTA处理使根际土壤As含量分别降低18.1%和14.3%。4种螯合剂均可以提高油葵对Cd、As污染土壤的修复效率。  相似文献   

可降解螯合剂及微生物强化植物吸收重金属的研究   总被引：2，自引：0，他引：2  

佟秀春  王旭梅  王红旗  耿印印 《东北农业大学学报》2011,42(8):101-107

添加不同微生物、不同比例的螯合剂(EDDS:EL),进行五因素四水平的正交试验,研究龙葵和羽叶鬼针草时复合污染型土壤中Cd和Pb的吸收能力.结果表明,龙葵对铅和镉具有超富集作用,适宜的螯合剂比例、微生物种类有利于提高植物对镉、铅的吸收能力.当土壤中镉投加浓度为60 mg· kg-1,铅投加浓度为1 800mg·kg-1...  相似文献   

Anti-oxidant activity of methanol extracts from Indonesian seaweeds in an oil emulsion model   总被引：2，自引：0，他引：2  

Joko  SANTOSO  Yumiko  YOSHIE-STARK  Takeshi  SUZUKI 《Fisheries Science》2004,70(1):183-188

  相似文献   

不同淋洗剂对污染土娄土中Cu、Pb的淋洗修复研究   总被引：3，自引：0，他引：3  

邓红侠  刘霞  王建涛 《西北农林科技大学学报(自然科学版)》2014,42(8):191-198

【目的】研究不同条件下螯合剂乙二胺四乙酸二钠盐(EDTA)、柠檬酸(CIT)和阴离子表面活性剂十二烷基硫酸钠(SDS)、生物表面活性剂鼠李糖脂(RL2)对污染土娄土中铜、铅的淋洗效果,并对淋洗机制进行探讨。【方法】以铜、铅单一污染的土娄土为研究对象,分别加入2种螯合剂(EDTA、CIT)和2种表面活性剂(SDS、RL2),采用批次试验方法,分析淋洗剂浓度、pH、背景电解质(NaNO3和NaCl)、水(mL)土(g)比、淋洗次数对污染土娄土中Cu和Pb的淋洗百分率的影响,探索不同淋洗剂淋洗污染土娄土中Cu和Pb的最佳条件。【结果】在相同浓度下,EDTA和CIT对污染土娄土中Cu的淋洗百分率明显高于其他淋洗剂,EDTA对Pb的淋洗百分率明显高于其他淋洗剂。淋洗4次后,4种淋洗剂对污染土娄土中Cu的淋洗能力由大到小为CITEDTARL2SDS,对污染土娄土中Pb的淋洗能力为EDTARL2CITSDS。EDTA和CIT溶液淋洗土娄土中Cu和Pb的最适条件为:水土比20(mL)∶1(g)、淋洗剂浓度0.01mol/L、pH=7、无背景电解质;当水土比为20(mL)∶1(g)、RL2溶液浓度为0.02mol/L、pH=8、无背景电解质条件下,RL2对污染土娄土中Cu、Pb的淋洗效果最佳。【结论】EDTA、CIT和RL2可以有效去除污染土娄土中的Cu,EDTA可作为石灰性污染土娄土中Pb的最佳淋洗剂,而SDS不宜作为污染性土壤的淋洗剂。  相似文献   

螯合剂对沉积物中铬的去向的影响     

WANG Xiao-Chang  SUN Jin-He  ZHANG Qin-Zheng  CAO Zhi-Hong  CHEN Zi-Yuan 《土壤圈》1996,6(2):163-166

A laboratory investigation on reaction between chelating agents and chromium was conducted to evaluate the effect of chelating agents on the adsorption and desorption of chromium in sediment. The amount of adsorbed chromium(Ⅵ) in sediment decreased slightly by 5%-10% because of addition of chelating agents. Chelating agents inhibited the removal of Cr(Ⅲ) by sediment from solutions and the inhibiting effect was in the order: citric acid > tartaric acid > EDTA, salicylic acid. No effect of chelating agents on desorption of chromium in sediment was observed.  相似文献   

共培养对土壤重金属污染植物修复的调控作用   总被引：2，自引：0，他引：2  

NI Cai-Ying  SHI Ji-Yan  LUO Yong-Ming  CHEN Ying-Xu 《土壤圈》2004,14(4):475-482

A co-culture of two plant materials, Astragalus sinicus L., a leguminous plant with concomitant nodules, and Elsholtzia splendens Naki-a Cu accumulator, along with treatments of a chelating agent (EDTA), root excretions (citric acid), and a control with E. splendens only were used to compare the mobility of heavy metals in chelating agents with a co-culture and to determine the potential for co-culture phytoremediation in heavy metal contaminated soils. The root uptake for Cu, Zn, and Pb in all treatments was significantly greater (P < 0.05) than that of the control treatment. However with translocation in the shoots, only Cu, Zn, and Pb in plants grown with the EDTA treatment and Zn in plants co-cropped with the A. sinicus treatment increased significantly (P < 0.05). In addition, when a co-culture in soils with heavy and moderate contamination was compared, for roots in moderately contaminated soils only Zn concentration was significantly less (P < 0.05) than that of heavily contaminated soils, however, Cu, Zn, and Pb concentrations of shoots were all significantly lower (P < 0.05). Overall, this "co-culture engineering" could be as effective as or even more effective than chelating agents, thereby preventing plant metal toxicity and metal leaching in soils as was usually observed in chelate-enhanced phytoremediation.  相似文献   

不同加成数C_(60)-β-丙氨酸衍生物的还原能力及金属螯合能力     

孙涛  孙斐  巢骏  谢晶  周冬香 《东北农业大学学报》2012,(8):21-24

为研究水溶性富勒烯衍生物抗氧化性能,通过控制反应配比,合成三种具有不同加成数目的水溶性C60-β-丙氨酸衍生物,C6(0NHCH2CH2COONa)nHn。采用红外、紫外、核磁共振、元素分析等手段对其进行结构表征。元素分析表明,三种不同加成数目的水溶性C60-β-丙氨酸衍生物A、B、C的加成数分别为2、4、8。同时考察三种衍生物的还原能力及金属螯合能力。结果表明,在还原能力体系中,当三种衍生物A、B、C浓度为2.5μmol.mL-1时,吸光度分别为0.424、0.612和1.040;在金属螯合能力体系中,三种衍生物A、B、C的半螯合浓度(当螯合率达到50%时,所需螯合物的浓度)分别为0.348、0.261和0.135μmol.mL-1。随着加成数目的增多,C60-β-丙氨酸衍生物的还原能力及金属螯合能力增强。  相似文献   

豆渣纤维改性多糖的抗氧化活性研究     

姚磊  王振宇  赵海田  程翠林  富校轶  孙树坤 《东北农业大学学报》2012,(11):16-19

利用酶法降解豆渣纤维,得到不同时间段的豆渣纤维改性多糖,对其清除ABTS自由基、亚铁离子螯合能力进行评价。结果表明,降解时间2、4、6、8、10、12 h大豆多糖组分对ABTS自由基有一定的清除效果,降解12 h组对ABTS自由基清除效果最好,EC50值为(34.62±1.21)mg·mL-1;对亚铁离子有较好的螯合作用,并呈现剂量依赖性,2 h组大豆多糖组分对亚铁离子螯合能力最强,5 mg·mL-1浓度时,螯合率达到62.92%±2.31%。  相似文献   

Characterization and bioactivities of young rice protein hydrolysates     

《Journal of Cereal Science》2020

Immature rice was reported to contain higher quantities of bioactive compounds than mature rice. Young rice protein is easy to digest and has hypoallergenic potential, with protein content of 7.2–11.5% compared to rice bran at 9.8%. Few studies have reported on bioactivities and characterization of young rice proteins and their hydrolysates. Bioactivities of native protein and protein hydrolysates of two rice varieties (white rice and colored rice) were characterized and investigated for four development stages (flowery, milky, dough, and mature). Degree of hydrolysis of young rice protein was considerably higher than at the mature stage. Highest DPPH and iron chelating activity were found in alcalase® protein hydrolysate during the flowery-to-milky stage. Iron chelating activity was constant in all development stages because of the low polar amino acid content in rice. The ACE activity of alcalase® protein hydrolysate was higher than native protein at the same development stage, as observed in the milky and dough stages. Inhibitory activity of young rice hydrolysate HepG2 cells was concentration-dependent and not correlated with protein molecular size.  相似文献   

不同浓度螯合剂和浸提时间对土壤磷素提取效果研究   总被引：2，自引：0，他引：2  

王祺  樊秉乾  张帅  张强  崔建宇  陈清 《水土保持学报》2018,32(6):302-308

为确定螯合剂活化土壤磷素的最佳浓度和最优浸提时间,参考水肥一体化技术,在室内浸提条件下,研究了不同浓度(0,0.05,0.1,0.25,0.5,1.0g/L)乙二胺四乙酸(EDTA)和柠檬酸螯合剂(pH=4)在不同浸提时间(1,12,24,48,72h)下对粮田、菜田土壤和有效磷被钝化后菜田土壤中磷素提取效果。结果表明:EDTA和柠檬酸在粮田土壤上对磷素提取中最佳条件为螯合剂浓度0.05g/L,浸提时间12h。EDTA和柠檬酸在菜田土壤、明矾钝化和混合钝化(明矾∶白云石为1∶1)菜田土壤上提取磷素的最佳条件为螯合剂浓度0.5g/L,浸提时间12h;而在白云石钝化土壤中则为螯合剂浓度0.5g/L,浸提时间1h。总体来看,柠檬酸的活化提取磷素效果优于EDTA,尤其是在采用明矾和白云石钝化的土壤上。  相似文献