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1.
Ferrous chelate absorption is deemed a promising method for NO removal from flue gas, but the key problem is the difficulty to regenerate the absorption solution, i.e. the complexes of FeⅡ(EDTA)NO and FeⅢ(EDTA) in the solution. Two bacterial strains isolated recently from the sludge of the denitrification step of a municipal wastewater treatment plant could be applied effectively to regenerate the absorbent were Pseudomonas sp. and klebsiella trevisan sp. Pseudomonas sp. exhibited high reduction ability on FeⅡ(EDTA)NO and the klebsiella trevisan sp. was more suitable for FeⅢ(EDTA) reduction. 相似文献
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INTRODUCTION Nitrogen oxides (NOx) are significant airborne contaminants resulting from fossil fuels combustion. The use of metal chelate additives for combined re- moval of NOx and SO2 in FGD (flue-gas desulfuriza- tion) systems was investigated by several groups (Harriott et al., 1993; Tsai et al., 1989; Shi et al., 1996a; 1997). Fe(II)EDTA (EDTA, ethylenediami- netetraacetate) as an additive for removing nitric oxide (NO) from flue gas had been extensively stud- ied, with the … 相似文献
3.
Scrubbing of NO
x
from the gas phase with Fe(II)EDTA has been shown to be highly effective. A new biological method can be used to convert
NO to N2 and regenerate the chelating agent Fe(II)EDTA for continuous NO absorption. The core of this biological regeneration is how
to effectively simultaneous reduce Fe(III)EDTA and Fe(II)EDTA-NO, two mainly products in the ferrous chelate absorption solution.
The biological reduction rate of Fe(III)EDTA plays a main role for the NO
x
removal efficiency. In this paper, a bacterial strain identified asKlebsiella Trevisan sp. was used to demonstrate an inhibition of Fe(III)EDTA reduction in the presence of Fe(II)EDTA-NO. The competitive inhibition
experiments indicted that Fe(II)EDTA-NO inhibited not only the growth rate of the iron-reduction bacterial strain but also
the Fe(III)EDTA reduction rate. Cell growth rate and Fe(III)EDTA reduction rate decreased with increasing Fe(II)EDTA-NO concentration
in the solution.
Project (No. 20176052) supported by the National Natural Science Foundation of China and the Scientific Research Foundation
for Returned Overseas Chinese Scholars, Ministry of Education 相似文献
4.
血红素蛋白质在甲基纤维素膜中的电化学研究 总被引：3，自引：0，他引：3
李业梅 《郧阳师范高等专科学校学报》2003,23(3):33-36,38
利用甲基纤维素(MC)水凝胶将肌红蛋白(Mb)、血红蛋白(Hb)、辣根过氧化物酶（HRP,)和过氧化氢酶(Cat)四种血红素蛋白质固定在裂解石墨电极表面，形成稳定的血红素蛋白质-MC膜修饰电极，在MC膜中，Mb、Hb、HRP和Cat直接与电极之间传递电子，四种血红素蛋白质的式电势都随溶液pH的增加而负移且呈线性关系，表明电子传递过程伴随着质子转移，这种氧化还原玻尔效应反应了蛋白质结构与功能的关系。 相似文献
5.
Phytoremediation is emerging as a potential cost-effective solution for remediation of contaminated soils, and bioavailability of metal in the soil for plant uptake is an important factor for successful phytoremediation. This study aimed at investigating the ability of EDTA and citric acid for enhancing soil bioavailability of Cu and phytoremediation by Elsholtzia splendens in two types of soils contaminated with heavy metals [i.e. mined soil from copper mining area (MS), and paddy soil (PS) polluted by copper refining]. The results showed that addition of 2.5 mmol/kg EDTA significantly increased the H2O extractable Cu concentration from 1.20 to 15.78 mg/kg in MS and from 0.26 to 15.72 mg/kg in PS, and that shoot Cu concentration increased 4-fold and 8-fold as compared to the control. There was no significant difference between the treatment with 5.0 mmol/kg EDTA and that with 2.5 mmol/kg EDTA, probably because that 2.5 mmol/kg EDTA was enough for elevating Cu bioavailability to the maximum level. As compared with the control, citric acid had no marked effect on both soil extractable Cu and shoot Cu concentration or accumulation. The results indicated that EDTA addition can increase the potential and efficiency of Cu phytoextraction by E. splendens in polluted soils. 相似文献
6.
INTRODUCTIONPhytoremediation,thatuseofgreenplantstodecontaminateCuandotherheavymetalsinsoils,isanemergingtechniquewithadvantagesofbeinginsitu,cost-effectiveandenvironmentallysus-tainable(Chanyetal.,1997;Cunninghametal.,1997;Saltetal.,1998).Theavailabilityofmetalinthesoilforplantuptakeisoneimportantlimitationforsuccessfulphytoremediation(Blaylocketal.,1997).Forexample,lead(Pb)isoneofthemostimportantenvironmentalpollutants,haslimitedsolubilityinsoils,andisavailableforplantuptakeduetocompl… 相似文献
7.
研究UV254光照下,Fe(Ⅲ)-EDTA/H2O2对苯酚的催化光降解效能。首先考察反应时间、溶液初始pH值、Fe(Ⅲ)与EDTA的浓度比值对UV/Fe(Ⅲ)-EDTA催化光降解苯酚的影响,进而考察UV/Fe(Ⅲ)-EDTA/H2O2体系对苯酚的降解效能。结果表明:当溶液pH为7,Fe(Ⅲ)/EDTA浓度比值为1:1时,经过1h反应,UV/Fe(Ⅲ)-EDTA体系对苯酚的催化光降解效率达61.13%。在溶液初始pH为37时,UV/Fe(Ⅲ)-EDTA对苯酚的降解率均可达60%以上。在中性条件下,UV/Fe(Ⅲ)-EDTA体系添加H2O2后可把苯酚的降解率从61.13%提高到91.30%。反应前后溶液的紫外扫描光谱表明光降解过程中苯酚的苯环共轭结构被破坏。最后对UV/Fe(Ⅲ)-EDTA/H2O2体系催化光降解机理进行了初步探讨。 相似文献
8.
Phytoremediation is emerging as a potential cost-effective solution for remediation of contaminated soils, and bioavailability
of metal in the soil for plant uptake is an important factor for successful phytoremediation. This study aimed at investigating
the ability of EDTA and citric acid for enhancing soil bioavailability of Cu and phytoremediation by Elsholtzia splendens
in two types of soils contaminated with heavy metals [i.e. mined soil from copper mining area (MS), and paddy soil (PS) polluted
by copper refining]. The results showed that addition of 2.5 mmol/kg EDTA significantly increased the H2O extractable Cu concentration from 1.20 to 15.78 mg/kg in MS and from 0.26 to 15.72 mg/kg in PS, and that shoot Cu concentration
increased 4-fold and 8-fold as compared to the control. There was no significant difference between the treatment with 5.0
mmol/kg EDTA and that with 2.5 mmol/kg EDTA, probably because that 2.5 mmol/kg EDTA was enough for elevating Cu bioavailability
to the maximum level. As compared with the control, citric acid had no marked effect on both soil extractable Cu and shoot
Cu concentration or accumulation. The results indicated that EDTA addition can increase the potential and efficiency of Cu
phytoextraction byE. splendens in polluted soils.
Project supported by the National Natural Science Foundation of China (No. 29977017) and the Science and Technology Ministry
of China (No. 2002CB410804) 相似文献
9.
Jun Lin Wei-ying Zheng Peng-ruo-feng Liu Ning Zhang Hui-ping Lin Yi-jing Fan Xin-hua Gu Oliver Vollrath Christian Mehl 《Journal of Zhejiang University. Science. B》2014,15(7):649-660
The aim of this study is to evaluate the influence of Tooth Mousse (TM) application, smear layer removal, and storage time on resin-dentin microtensile bond strength (μTBS). Dentin specimens were divided into two groups: (1) smear layer covered; (2) smear layer removed using 15% EDTA for 90 s. In each group, half the specimens were treated once with TM for 60 min. After bonding procedures using a two-step self-etching adhesive (Clearfil SE Bond (CSE); Kuraray Medical, Tokyo, Japan), an all-in-one adhesive (G-Bond (GB); GC Corp, Tokyo, Japan), and a total-etch adhesive (Adper Single Bond 2 (SB); 3M ESPE, St. Paul, MN, USA), the specimens were stored for 3 d or 6 months in deionized water at 37 °C, and μTBS was tested and analyzed. With the exception of SB (no TM application) and GB, the μTBS was significantly increased for CSE and SB using EDTA pre-conditioning and 3 d of storage (P≤0.001). Bond strength of GB decreased significantly when using EDTA (3 d storage, P<0.05). TM application only increased the μTBS of GB (no EDTA) and SB (with EDTA) after 3 d (P≤0.02). Comparing the adhesives after 3 d of storage, CSE exhibited the greatest μTBS values followed by GB and SB (P≤0.02). The factors of adhesive, EDTA, and TM did not show any significant impact on μTBS when specimens were stored for 6 months (P>0.05). The additional application of TM and EDTA for cavity preparation seems only to have a short-term effect, and no influence on μTBS of dentin bonds after a period of 6 months. 相似文献
10.
目的：探讨土茯苓中药复方制剂和大蒜油的排铅效果,为铅中毒的防治提供一定的理论依据。方法：以40mg／L的醋酸铅溶液,按0．01mug体重剂量连续15d灌胃造模,造模成功后将48只雄性成年小鼠随机分成4组,即土茯苓中药复方制剂组、大蒜油组、乙二胺四乙酸组和中毒不治疗组,连续15d驱铅治疗。在造模前、第16天、第31天分别测定各组小鼠的体重及抽取小鼠尾部全血并用石墨炉原子吸收法直接测定小鼠的血铅含量,对实验结果进行统计学分析。结果：①血铅含量：统计学意义驱铅治疗后,土茯苓中药复方制剂组、大蒜油组、乙二胺四乙酸组分别与中毒不治疗组的血铅含量比较,差异均有统计学意义（P〈0．01）;土茯苓中药复方制剂组、大蒜油组、乙二胺四乙酸组的血铅含量两两比较,差异有统计学意义（P〈0．01）。驱铅治疗后各组的血铅含量为：土茯苓中药复方制剂组〈EDTA组〈大蒜油组〈中毒不治疗组。（参体重：土茯苓中药复方制剂组、大蒜油组分别与中毒不治疗组的体重比较,差异有统计学意义（P〈0．05）;土茯苓中药复方制剂组与大蒜油组的体重比较,差异有统计学意义（P〈0．05）。土茯苓中药复方制剂组的体重〉大蒜油组的体重。③存活率：土茯苓中药复方制剂组、大蒜油组分别与中毒不治疗组的存活率比较,差异有统计学意义（P〈0．01）;土茯苓中药复方制剂组与大蒜油组的存活率比较,差异无统计学意义（P〉O．05）。结论：土茯苓中药复方制剂、大蒜油对血铅均有促排作用;驱铅功效为：土茯苓中药复方制剂〉大蒜油。 相似文献
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废彩色漂定液中银的回收及再生利用 总被引：3，自引：0，他引：3
彩色感光材料的冲洗时会产生大量的废票定液，其中含有贵金属银及络合能力极强的EDTA，将废漂定液中的银回收后再利用，还可将回收银后的废液用来处理水体中汞污染。本文讨论了废漂定液中银的回收方法及废漂定液中的EDTA在渔业养殖中的再利用问题。 相似文献
14.
Changes of root morphology and Pb uptake by two species of Elsholtzia under Pb toxicity 总被引：2，自引：1，他引：2
Elsholtzia argyi and Elsholtzia splendens, which are Chinese endemic Pb/Zn mined and Cu mined ecotype respectively, were investigated on the aspect of their response to Pb toxicity in the presence or absence of EDTA addition. After 8 d's Pb treatment, root length, root surface area and root volume of E. splendens decreased much more than those ofE. argyi, and reduced considerably with increase of Pb, while no marked change was noted for root average diameter. Compared to E. argyi, length of root with diameter (D)＜0.2 mm was significantly reduced for E. splendens as Pb increased. D＜0.1 mm E. splendens root had cross-sectional surface area at Pb≥10 mg/L, while for E. argyi, it was at Pb＞25 mg/L. With increase ofPb, DW ofE. splendens decreased much more than that of E. argyi. E. argyi exhibited much more tolerance to Pb toxicity than E. splendens. Treatment with 100 mg/L Pb plus 50 mmol/L EDTA significantly decreased the length and surface area of D≤0.2 mm root, increased the length and surface area of 0.2≤D≤0.8 mm root for the case ofE. argyi, while for E. splendens, length and surface area of D＜0.6 mm root reduced, as compared to 100 mg/L Pb treatment, alone. At 100 mg/L Pb, shoot Pb accumulation in E. splendens and E. argyi were 27.9 and 89.0 μg/plant DW respectively, and much more Pb was uptaken by the root and translocated to the stem ofE. argyi as compared to E. splendens. Treatment of the plant with 100 mg/L Pb plus 50 mmol/L EDTA increased leaf Pb accumulation from 16.8 to 84.9 g/plant for E. splendens and from 18.8 to 52.5 g/plant for E. argyi, while both root and stem Pb pronouncedly reduced for both Elsholtzia species. The increased translocation of Pb to the leaf ofE. splendens being than that ofE. argyi after treatment with 100 mg/L Pb plus 50 mmol/L EDTA should be further investigated. 相似文献
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Population structure and linkage disequilibrium in elite barley breeding germplasm from the United States 总被引：2，自引：0，他引：2
Hao Zhou Gary Muehlbauer Brian Steffenson 《Journal of Zhejiang University. Science. B》2012,13(6):438-451
Cultivated barley is known to have a complex population structure and extensive linkage disequilibrium (LD). To conduct robust association mapping (AM) studies of economically important traits in US barley breeding germplasm, population structure and LD decay were examined in a complete panel of US barley breeding germplasm (3 840 lines) genotyped with 3 072 single nucleotide polymorphisms (SNPs). Nine subpopulations (sp1‒sp9) were identified by the program STRUCTURE and subsequently confirmed by principle component analysis (PCA). Out of the nine subpopulations, seven were very similar to the respective subpopulations identified by Hamblin et al. (2010) which were based on half of the germplasm and half of the SNP markers, but two subpopulations were found to be new. One subpopulation was dominated by six-rowed spring lines from Utah State University (UT) and the other was composed of six-rowed spring lines from multiple breeding programs (USDA-ARS Aberdeen (AB), Busch Agricultural Resources Inc. (BA), UT, and Washington State University (WA)). LD was found to decay across a range from 4.0 to 19.8 cM. This result indicates that the germplasm genotyped with 3 072 SNPs would be robust for mapping and possibly identifying the causal polymorphisms contributing to disease resistance and perhaps other traits. 相似文献
17.
化学淋洗法修复重金属污染土壤效果研究 总被引：6，自引：0，他引：6
在国内外相关研究的基础上,文章研究化学淋洗修复技术在重金属污染土壤修复方面的运用．用浓酸消解土样并用火焰原子吸收法测定土壤中重金属含量,选用土壤柱作淋洗实验,分析去离子水和EDTA溶液两种淋洗剂对Cu、Zn、Pb、Cd四种重金属的淋洗效率,并对化学淋洗修复效果进行比较． 相似文献
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辣椒青枯病拮抗细菌的筛选及其鉴定 总被引：8，自引：0，他引：8
从河南扶沟、江苏南京和淮阴等地的辣椒、番茄和黄瓜植物根围土壤中分离到100个细菌菌株.采用抑菌圈-定殖力双重测定法,筛选出5株终定植密度大于104cfu/g根、抑菌能力较强的细菌菌株;并对5个生物防治菌进行了生理生化测定.结果表明,5个生物防治菌分别属芽孢杆菌属、沙雷氏菌属、假单孢菌属和肠杆菌属. 相似文献
19.
YUAN Bo MURAYAMA Koichi 《浙江大学学报(A卷英文版)》2007,8(2):171-175
INTRODUCTION The bands of near-infrared (NIR) spectra have low absorptivities, which allow in situ analysis of chemical and biological materials with no or little sample preparation. Therefore, as one of the most important nondestructive analytical techniques, NIR spectroscopy is being extensively applied in the fields of agriculture, industry, biotechnology and medicine (Siesler et al., 2002; Scarff et al., 2006; Ward et al., 2006). Recently, with instrumental developments such as Fou… 相似文献
20.
在配位滴定中,常用标准的EDTA溶液滴定金属离子,达到测定试样中金属含量的目的,因而在实际中有广泛的应用。 相似文献