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EDTA螯合-电絮凝处理低浓度含铀废水 被引量:8
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作者 高旭 李鹏 +2 位作者 王学刚 廖平平 聂世勇 《环境工程》 CAS CSCD 北大核心 2018年第7期27-32,共6页
采用多羧基的乙二胺四乙酸(EDTA)为络合剂,与废水中铀酰离子(UO_2^(2+))进行螯合作用形成较为稳定的EDTA-U(VI)螯合物,继而通过电絮凝技术处理低浓度(<5.0 mg/L)含铀废水。在pH为5.0、电流密度为0.6 m A/cm^2、n(EDTA)∶n(UO_2^(2+))... 采用多羧基的乙二胺四乙酸(EDTA)为络合剂,与废水中铀酰离子(UO_2^(2+))进行螯合作用形成较为稳定的EDTA-U(VI)螯合物,继而通过电絮凝技术处理低浓度(<5.0 mg/L)含铀废水。在pH为5.0、电流密度为0.6 m A/cm^2、n(EDTA)∶n(UO_2^(2+))为3∶1条件下,与直接电絮凝法相比EDTA螯合-电絮凝法对铀去除率提升了17.73百分点;EDTA螯合-电絮凝法除铀符合二级动力学模型,添加EDTA螯合后反应速率常数k从0.1005 min^(-1)提高到0.3256 min^(-1)。EDTA螯合-电絮凝处理含铀废水的主要影响因素为初始pH、电流密度、EDTA投加量及初始铀浓度。在pH为6.0、电流密度为1.0 m A/cm^2、n(EDTA)∶n(UO_2^(2+))为3∶1、反应时间为24 min的优化条件下,初始铀浓度为3.693 mg/L的废水中铀去除率可达98.75%,残余铀浓度为0.046 mg/L,可达GB 23727—2009《铀矿冶辐射防护和环境保护规定》中排放废水铀含量的环境受纳值(<0.05 mg/L)。 展开更多
关键词 含铀废水 edta螯合 电絮凝 动力学
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生物降解乙二胺四乙酸(EDTA)研究进展 被引量:11
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作者 林琳 袁志文 《净水技术》 CAS 2008年第5期10-13,共4页
乙二胺四乙酸(EDTA)能形成高度稳定的水溶性金属离子-EDTA络合物,被广泛应用于各种工业和家用领域。由于它很难被常规水和废水处理工艺所去除,EDTA在许多地表水和地下水中成为浓度最高的人工合成有机物。论文简要总结了EDTA的用途、主... 乙二胺四乙酸(EDTA)能形成高度稳定的水溶性金属离子-EDTA络合物,被广泛应用于各种工业和家用领域。由于它很难被常规水和废水处理工艺所去除,EDTA在许多地表水和地下水中成为浓度最高的人工合成有机物。论文简要总结了EDTA的用途、主要环境风险、微生物降解途径、金属离子对EDTA生物降解的影响和生物处理工艺去除EDTA的最新研究进展。 展开更多
关键词 edta 络合剂 金属离子-edta络合物 生物降解 难降解有机物
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EDTA螯合树脂对镉离子的吸附性能探究 被引量:2
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作者 吴佳林 鲍纬 +1 位作者 程云雷 曹有名 《安徽化工》 CAS 2017年第4期28-30,35,共4页
研究了EDTA螯合树脂对水溶液中镉离子的吸附能力,测试不同的p H、吸附时间、吸附温度、镉离子的溶液浓度对吸附性能的影响;并分析了EDTA螯合树脂溶胀度。结果表明:EDTA螯合树脂对镉离子的吸附性能随p H的增大先增强后降低;随吸附时间的... 研究了EDTA螯合树脂对水溶液中镉离子的吸附能力,测试不同的p H、吸附时间、吸附温度、镉离子的溶液浓度对吸附性能的影响;并分析了EDTA螯合树脂溶胀度。结果表明:EDTA螯合树脂对镉离子的吸附性能随p H的增大先增强后降低;随吸附时间的延长而增强,然后趋于平缓;随温度升高而增大;随初始镉离子溶液浓度的增大而不断增强,吸附过程符合Langmuir等温吸附方程。EDTA螯合树脂的溶胀程度较高。 展开更多
关键词 edta螯合树脂 镉离子 吸附
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EDTA螯合钙对无土栽培生菜生长及品质的影响 被引量:1
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作者 王子凡 李友丽 +3 位作者 郭文忠 高洪波 王利春 李灵芝 《北方园艺》 CAS 北大核心 2021年第6期53-58,共6页
以"富兰德里"生菜(Lactuca sativa‘Flandria’)为试材,采用基质栽培的方法,研究了EDTA螯合钙对无土栽培生菜生长的影响,以期探索用EDAT螯合钙替代游离钙离子作为无土栽培营养液钙源的可行性,避免营养液施配过程中钙肥有效性... 以"富兰德里"生菜(Lactuca sativa‘Flandria’)为试材,采用基质栽培的方法,研究了EDTA螯合钙对无土栽培生菜生长的影响,以期探索用EDAT螯合钙替代游离钙离子作为无土栽培营养液钙源的可行性,避免营养液施配过程中钙肥有效性降低的问题。结果表明:与对照CK相比,T1、T2处理生菜在冠部鲜质量、品质性状上未表现出明显差异,且符合生产商品性要求。随着营养液螯合钙浓度的进一步增大,生菜的SPAD值虽然有所增加,但累积蒸腾耗水、地上部鲜质量和营养液利用效率均受到显著抑制。因此,采用螯合钙剂作为无土栽培作物营养液的钙源时,要注意控制营养液的螯合钙浓度不宜超过20 mg·L^(-1),防止产量降低、营养液利用效率下降。 展开更多
关键词 生菜 营养液 无土栽培 edta螯合钙
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电感耦合等离子体发射光谱仪测定水溶肥中EDTA螯合态钙 被引量:1
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作者 郑建国 于南树 +2 位作者 王伯通 李成志 刘永秀 《山东化工》 CAS 2018年第7期62-63,共2页
水溶肥中的中量元素钙为了保证其在肥料中的稳定性和作物吸收上的高效性部分存在于EDTA的螯合态下,这部分钙不能采用EDTA滴定法测定,实验室主要检测方法为高锰酸钾滴定法,较为繁琐,也不能直接采用ICP-OES法直接测定,因为酸性环境会导致... 水溶肥中的中量元素钙为了保证其在肥料中的稳定性和作物吸收上的高效性部分存在于EDTA的螯合态下,这部分钙不能采用EDTA滴定法测定,实验室主要检测方法为高锰酸钾滴定法,较为繁琐,也不能直接采用ICP-OES法直接测定,因为酸性环境会导致固体析出,堵塞毛细管,利用本文中提出的酸解后,再加入10mL EDTA进行充分螯合,及时调整p H值到9.0~10.0之间,碱性环境下,钙在EDTA螯合下不会形成沉淀,经测定相对标准偏差小于2%,加标回收率在98.5%~102.25%之间,ICP-OES测定的结果和高锰酸钾滴定法基本一致。表明这种简单的处理方法对ICP-OES快速测定水溶肥中EDTA螯合态钙准确、有效。 展开更多
关键词 ICP-OES edta螯合态钙 检测分析
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The Effect of EDTA Chelation Therapy in Symptomatic Coronary Heart Disease: An Observational Study
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作者 Chulananda D. A. Goonasekera Rohini Tennakoon +4 位作者 Premil N. Rajakrishna Gammadegedara A. Gunasena Chandima R. Wanniarachchi Asanka B. Yatawatta Udawatta A. D. D. Munidasa 《Chinese Medicine》 2010年第2期49-54,共6页
Ethylene Diamine Tetra Acetic Acid (EDTA) chelation therapy has been considered a definitive alternative therapy for by-pass surgery in atherosclerotic cardiovascular disease for more than four decades. It is a relati... Ethylene Diamine Tetra Acetic Acid (EDTA) chelation therapy has been considered a definitive alternative therapy for by-pass surgery in atherosclerotic cardiovascular disease for more than four decades. It is a relatively inexpensive method believed to restore blood flow in atherosclerotic vessels. However, the benefits of chelation therapy yet remain controversial in the treatment of ischemic heart disease. We observed the effect of EDTA chelation therapy on exercise tolerance in 13 volunteering patients receiving conventional treatment for established symptomatic coronary heart disease. Each patient received 30 weekly infusions of EDTA followed by monthly 12 boosters according to the ACAM protocol (American College for Advancement in Medicine). This was in addition to the conventional therapies they received from their respective physician in hospital. Stress ECG, echocardiography and coronary angiogram findings were obtained at the beginning of treatment. The distance that a patient could walk on level ground at moderate speed and the number of steps he/she can climb up on a staircase until he/she begins to feel either chest pain or breathlessness were the two clinical parameters of exercise tolerance recorded to grade angina. Liver and renal functions were tested at 1st, 5th, 10th, 15th and 30th infusions. Of the 13 patients, 11 showed improvement in angina grading whilst 2 experienced no effect. One patient improved from angina grade IV to I, 6 from grade III to I, 1 from grade III to II and 3 from grade II to I. A statistically significant reduction in the mean score (p = 0.002) was noticed at 6th month of treatment when compared to that of the first month. A significant 1.7 fold increase (p = 0.009) in the mean SGPT level was observed at the 30th infusion when compared to the pre-treatment values. The SGOT level showed no significant change (p = 0.664). None of the patients showed clinical features of hepato-cellular damage. The mean serum creatinine level showed a trend for reduction (p = 0.083) with trea 展开更多
关键词 edta chelatION Therapy CORONARY Heart Disease EXERCISE Tolerance
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The Effects of Magnesium-EDTA Chelation Therapy on Arterial Stiffness
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作者 P. J. Van der Schaar R. Th. B. Pahlplatz E. Blaurock-Busch 《Health》 2014年第21期2848-2853,共6页
Traditional risk factors for cardiovascular disease can only assess risks for groups of people. New parameters of arterial stiffness are more reliable for predicting cardiovascular outcomes for individuals with and wi... Traditional risk factors for cardiovascular disease can only assess risks for groups of people. New parameters of arterial stiffness are more reliable for predicting cardiovascular outcomes for individuals with and without a cardiovascular history. The objective of this study was to assess the effects of Magnesium-EDTA chelation therapy using new methods and parameters such as pulse wave velocity (PWV), central blood pressure (SBPao) and endothelial function (Aix). We followed 43 patients with an abnormal PWV and SBPao, setting them up in two groups. The 21 patients in Group A had already been diagnosed with cardiovascular disease. The other 22 patients in Group B also showed abnormal PWV, SBPao and Aix, but showed no cardiovascular symptoms. Each patient in Groups A and B received one Mg-EDTA treatment per week. The total treatment plan consisted of 25 Mg-EDTA chelation treatments according to the standard protocol of IBCMT. After 25 Mg-EDTA chelation sessions, PWV and SBPao improved significantly in all patients of Groups A and B. In addition, Aix improved significantly in these patients, but remained abnormal. Group C included 18 asymptomatic patients with normal PWV or SBPao. Aix was abnormal in this group, but to a much lesser extent than Groups A and B. The 18 asymptomatic patients of Group C did not receive Mg-EDTA treatment. Observation showed no significant changes in all three parameters of arterial stiffness. The results of this study indicate that a course of treatment with Magnesium-EDTA chelation therapy significantly lowers cardiovascular risks. We conclude that Mg-EDTA chelation therapy improves PWV as an indicator of arterial stiffness, SBPao (central blood pressure) as an indicator of aortic elasticity and Aix (augmented aortic index) as an indicator of endothelial functioning. These improvements in PWV, SBPao and Aix demonstrate that atherosclerosis is a dynamic and (partially) reversible process. 展开更多
关键词 ARTERIAL Stiffness Pulse Wave Velocity Central Blood Pressure Augmented AORTIC Index Magnesium-edta chelatION Therapy CARDIOVASCULAR Risks
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PMN-PT弛豫铁电粉体的溶胶-凝胶法制备及其性质 被引量:11
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作者 王歆 庄志强 齐雪君 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2002年第2期306-310,共5页
以无机盐或氧化物Nb2O5、MgO、TiCl4和Pb(AC)2、3H2O为原材料,柠檬酸和EDTA为复合螫合剂,乙二醇为溶剂,分别制备Nb、Mg-Nb、Ti和Pb的有机化合物前驱液,采用溶胶-凝胶工艺制备PMN-PT... 以无机盐或氧化物Nb2O5、MgO、TiCl4和Pb(AC)2、3H2O为原材料,柠檬酸和EDTA为复合螫合剂,乙二醇为溶剂,分别制备Nb、Mg-Nb、Ti和Pb的有机化合物前驱液,采用溶胶-凝胶工艺制备PMN-PT弛豫铁电陶瓷粉体及其烧结体.讨论了制备工艺和螯合剂等对金属有机化合物溶液的性质、材料物相形成和介电性能的影响. 展开更多
关键词 溶胶-凝胶法 PMN-PT弛豫铁电体 柠檬酸-edta复合螯合剂 无机盐
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Fe(Ⅱ)(EDTA)螯合物/UV催化臭氧工艺降解聚丙烯酰胺溶液 被引量:4
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作者 于忠臣 钟柳波 +1 位作者 王松 吴江 《化学通报》 CAS CSCD 北大核心 2016年第4期372-376,共5页
采用Fe(II)(EDTA)螯合物/UV催化臭氧降解聚丙烯酰胺(PAM)溶液,探讨水力停留时间(HRT)、单独臭氧和Fe(II)(EDTA)螯合物催化臭氧对PAM溶液粘度和PAM去除率的影响,研究生化需氧量与化学需氧量之比(B/C)随HRT变化的规律,考察Fe(II)(EDTA)螯... 采用Fe(II)(EDTA)螯合物/UV催化臭氧降解聚丙烯酰胺(PAM)溶液,探讨水力停留时间(HRT)、单独臭氧和Fe(II)(EDTA)螯合物催化臭氧对PAM溶液粘度和PAM去除率的影响,研究生化需氧量与化学需氧量之比(B/C)随HRT变化的规律,考察Fe(II)(EDTA)螯合物/UV催化臭氧体系对PAM溶液可生化效能影响;研究表面活性剂对Fe(II)(EDTA)螯合物/UV催化臭氧工艺降低PAM粘度的影响,并探讨草酸对该工艺降解PAM溶液影响规律。结果表明,Fe(II)(EDTA)螯合物/UV催化臭氧法对PAM溶液降解效能良好,在15min内,PAM溶液的粘度可以降低57%,在120min后,PAM去除率可达75%,B/C从0.121提升到0.423。表面活性剂对Fe(II)(EDTA)螯合物/UV催化臭氧工艺降低PAM溶液粘度影响较小。草酸不利于Fe(II)(EDTA)/UV催化臭氧工艺去除PAM和降低PAM溶液粘度,这是因为草酸造成的酸性环境抑制了臭氧在水中的分解作用,从而导致草酸/Fe(II)(EDTA)/O3体系中PAM溶液的降粘效果和去除率低于Fe(II)(EDTA)/O3体系。 展开更多
关键词 Fe(Ⅱ)(edta)螯合物 UV 臭氧 聚丙烯酰胺 粘度
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Ethylenediaminetetraacetic Acid Chelation for Band Keratopathy before Ab Interno Glaucoma Surgery
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作者 Tomoki Shirakami Yasuyuki Takai +1 位作者 Mihoko Mochiji Masaki Tanito 《Open Journal of Ophthalmology》 2019年第4期165-167,共3页
An 87-year-old woman with primary open-angle glaucoma presented to our hospital. Although the combined cataract and minimally invasive glaucoma surgeries (MIGS) were an appropriate surgical option, the presence of ban... An 87-year-old woman with primary open-angle glaucoma presented to our hospital. Although the combined cataract and minimally invasive glaucoma surgeries (MIGS) were an appropriate surgical option, the presence of band keratopathy made it difficult to perform ab interno glaucoma surgery in her right eye (OD);therefore, the corneal opacity was removed using ethylenediaminetetraacetic acid (EDTA) chelation procedure. One month after chelation, microhook ab interno trabeculotomy and cataract surgery were performed successfully. Clear intraoperative visualization of the angle structures is critical for the success of these MIGS procedures. In glaucomatous eyes that require MIGS, EDTA chelation is a good neoadjuvant therapy for coexisting band keratopathy. 展开更多
关键词 Microhook Ab Interno TRABECULOTOMY Minimally Invasive GLAUCOMA Surgery (MIGS) BAND KERATOPATHY Primary OPEN-ANGLE GLAUCOMA Ethylene-Diamine-Tetra-Acetic Acid (edta) chelatION
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