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Volumn 86, Issue , 2012, Pages 26-34

Effects of oxalate and phosphate on electrokinetic removal of arsenic from mine tailings

Author keywords

Arsenic; Electrokinetic remediation; Equilibrium modeling; Oxalate extraction; Tailings

Indexed keywords

CO-EXISTING; DESORPTION TESTS; ELECTROKINETIC; ELECTROKINETIC EXPERIMENTS; ELECTROKINETIC REMEDIATION; EQUILIBRIUM MODELING; EXTRACTANTS; MAJOR ELEMENTS; MIDDLE SECTION; MINE TAILINGS; MODELING RESULTS; OXALATE EXTRACTION; OXYHYDROXIDES; PHOSPHATE IONS; PHOSPHATE SOLUTIONS; REDOX GRADIENTS;

EID: 84856353179     PISSN: 13835866     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.seppur.2011.10.016     Document Type: Article
Times cited : (33)

References (47)
  • 1
    • 0037119139 scopus 로고    scopus 로고
    • Arsenic round the world: A review
    • DOI 10.1016/S0039-9140(02)00268-0, PII S0039914002002680
    • B.K. Mandal, and K.T. Suzuki Arsenic round the world: a review Talanta 58 2005 201 235 (Pubitemid 34857394)
    • (2002) Talanta , vol.58 , Issue.1 , pp. 201-235
    • Mandal, B.K.1    Suzuki, K.T.2
  • 2
    • 0036219601 scopus 로고    scopus 로고
    • A review of the source, behaviour and distribution of arsenic in natural waters
    • DOI 10.1016/S0883-2927(02)00018-5, PII S0883292702000185
    • P.L. Smedley, and D.G. Kinniburgh A review of the source, behaviour and distribution of arsenic in natural waters Appl. Geochem. 17 2002 517 568 (Pubitemid 34290137)
    • (2002) Applied Geochemistry , vol.17 , Issue.5 , pp. 517-568
    • Smedley, P.L.1    Kinniburgh, D.G.2
  • 3
    • 33745976501 scopus 로고    scopus 로고
    • Occurrence of arsenic contamination in Canada: Sources, behavior and distribution
    • DOI 10.1016/j.scitotenv.2005.09.005, PII S0048969705006170
    • S. Wang, and C.N. Mulligan Occurrence of arsenic contamination in Canada: sources, behavior and distribution Sci. Total Environ. 366 2006 701 721 (Pubitemid 44063541)
    • (2006) Science of the Total Environment , vol.366 , Issue.2-3 , pp. 701-721
    • Wang, S.1    Mulligan, C.N.2
  • 4
    • 0036497109 scopus 로고    scopus 로고
    • Electroremediation of contaminated soils
    • DOI 10.1061/(ASCE)0733-9372(2002)128:3(208)
    • M.M. Page, and C.L. Page Electroremediation of contaminated soils J. Environ. Eng.-ASCE 128 2002 208 219 (Pubitemid 34244049)
    • (2002) Journal of Environmental Engineering , vol.128 , Issue.3 , pp. 208-219
    • Page, M.M.1    Page, C.L.2
  • 5
    • 0037156423 scopus 로고    scopus 로고
    • Electrokinetic soil remediation - Critical overview
    • DOI 10.1016/S0048-9697(01)01027-0, PII S0048969701010270
    • J. Virkutyte, M. Sillanpää, and P. Latostenmaa Electrokinetic soil remediation - a critical overview Sci. Total Environ. 289 2002 97 121 (Pubitemid 34311788)
    • (2002) Science of the Total Environment , vol.289 , Issue.1-3 , pp. 97-121
    • Virkutyte, J.1    Sillanpaa, M.2    Latostenmaa, P.3
  • 6
    • 77951879278 scopus 로고    scopus 로고
    • Copper and trace element fractionation in electrokinetically treated methanogenic anaerobic granular sludge
    • DOI 10.1016/j.envpol.2005.04.009, PII S0269749105002332
    • J. Virkutyte, E. Hullebusch, M. Sillanpää, and P. Lens Copper and trace element fractionation in electrokinetically treated anaerobic granular sludge Environ. Pollut. 138 2005 518 529 (Pubitemid 41140403)
    • (2005) Environmental Pollution , vol.138 , Issue.3 , pp. 518-529
    • Virkutyte, J.1    Van Hullebusch, E.2    Sillanpaa, M.3    Lens, P.4
  • 7
    • 39749202283 scopus 로고    scopus 로고
    • Soil washing for metal removal: A review of physical/chemical technologies and field applications
    • DOI 10.1016/j.jhazmat.2007.10.043, PII S0304389407014902
    • G. Dermont, M. Bergeron, G. Mercier, and M. Richer-Laflche Soil washing for metal removal: a review of physical/chemical technologies and field applications J. Hazard. Mater. 152 2008 1 31 (Pubitemid 351312436)
    • (2008) Journal of Hazardous Materials , vol.152 , Issue.1 , pp. 1-31
    • Dermont, G.1    Bergeron, M.2    Mercier, G.3    Richer-Lafleche, M.4
  • 9
    • 34547152717 scopus 로고    scopus 로고
    • Soil washing of As-contaminated stream sediments in the vicinity of an abandoned mine in Korea
    • DOI 10.1007/s10653-007-9093-1, KoSSGE 10th Annivesary International Symposium on Soil and Groundwater Environment
    • M. Lee, I.S. Paik, W. Do, I. Kim, Y. Lee, and S. Lee Soil washing of As-contaminated stream sediments in the vicinity of an abandoned mine in Korea Environ. Geochem. Health 29 2007 319 329 (Pubitemid 47108506)
    • (2007) Environmental Geochemistry and Health , vol.29 , Issue.4 , pp. 319-329
    • Lee, M.1    Paik, I.S.2    Do, W.3    Kim, I.4    Lee, Y.5    Lee, S.6
  • 10
    • 70349247753 scopus 로고    scopus 로고
    • Extraction behavior of As, Pb, and Zn from mine tailings with acid and base solutions
    • J.S. Yang, J.Y. Lee, K. Baek, T.S. Kwon, and J. Choi Extraction behavior of As, Pb, and Zn from mine tailings with acid and base solutions J. Hazard. Mater. 171 2009 443 451
    • (2009) J. Hazard. Mater. , vol.171 , pp. 443-451
    • Yang, J.S.1    Lee, J.Y.2    Baek, K.3    Kwon, T.S.4    Choi, J.5
  • 11
    • 33646561214 scopus 로고    scopus 로고
    • Chemical extraction of arsenic from contaminated soil
    • M.G.M. Alam, and S. Tokunaga Chemical extraction of arsenic from contaminated soil J. Environ. Sci. Health A 41 2006 631 643
    • (2006) J. Environ. Sci. Health A , vol.41 , pp. 631-643
    • Alam, M.G.M.1    Tokunaga, S.2
  • 12
    • 0034281612 scopus 로고    scopus 로고
    • Effectiveness of phosphate and hydroxide for desorption of arsenic and selenium species from iron oxides
    • B.P. Jackson, and W.P. Miller Effectiveness of phosphate and hydroxide for desorption of arsenic and selenium species from iron oxides Soil. Sci. Soc. Am. J. 64 2000 1616 1622
    • (2000) Soil. Sci. Soc. Am. J. , vol.64 , pp. 1616-1622
    • Jackson, B.P.1    Miller, W.P.2
  • 13
    • 33750970306 scopus 로고    scopus 로고
    • Sequential soil washing techniques using hydrochloric acid and sodium hydroxide for remediating arsenic-contaminated soils in abandoned iron-ore mines
    • DOI 10.1016/j.chemosphere.2006.05.056, PII S0045653506007181
    • M. Jang, J.S. Hwang, and S.I. Choi Sequential soil washing techniques using hydrochloric acid and sodium hydroxide for remediating arsenic-contaminated soils in abandoned iron-ore mines Chemosphere 66 2007 8 17 (Pubitemid 44751890)
    • (2007) Chemosphere , vol.66 , Issue.1 , pp. 8-17
    • Jang, M.1    Hwang, J.S.2    Choi, S.I.3
  • 14
    • 28344446003 scopus 로고    scopus 로고
    • Assessment of pilot-scale acid washing of soil contaminated with As, Zn and Ni using the BCR three-step sequential extraction
    • DOI 10.1016/j.jhazmat.2005.06.041, PII S0304389405003717
    • I. Ko, Y.Y. Chang, C.H. Lee, and K.W. Kim Assessment of pilot-scale acid washing of soil contaminated with As, Zn and Ni using the BCR three-step sequential extraction J. Hazard. Mater. 127 2005 1 13 (Pubitemid 41719195)
    • (2005) Journal of Hazardous Materials , vol.127 , Issue.1-3 , pp. 1-13
    • Ko, I.1    Chang, Y.-Y.2    Lee, C.-H.3    Kim, K.-W.4
  • 15
    • 77955577213 scopus 로고    scopus 로고
    • Sequential electrokinetic treatment and oxalic acid extraction for the removal of Cu, Cr and As from wood
    • P. Isosaari, P. Marjavaara, and E. Lehmus Sequential electrokinetic treatment and oxalic acid extraction for the removal of Cu, Cr and As from wood J. Hazard. Mater. 182 2010 869 876
    • (2010) J. Hazard. Mater. , vol.182 , pp. 869-876
    • Isosaari, P.1    Marjavaara, P.2    Lehmus, E.3
  • 16
    • 0032145123 scopus 로고    scopus 로고
    • Arsenic speciation in iron hydroxide precipitates
    • DOI 10.1016/S0039-9140(97)00333-0, PII S0039914097003330
    • B. Daus, H. Weib, and R. Wennrich Arsenic speciation in iron hydroxide precipitates Talanta 46 1998 867 873 (Pubitemid 28335852)
    • (1998) Talanta , vol.46 , Issue.5 , pp. 867-873
    • Daus, B.1    Weiss, H.2    Wennrich, R.3
  • 17
    • 0042703211 scopus 로고    scopus 로고
    • Speciation of the most soluble phases in a sequential extraction procedure adapted for geochemical studies of copper sulfide mine waste
    • DOI 10.1016/S0375-6742(03)00182-1
    • B. Dold Speciation of the most soluble phases in a sequential extraction procedure adapted for geochemical studies of copper sulphide mine waste J. Geochem. Explor. 80 2003 55 68 (Pubitemid 36946989)
    • (2003) Journal of Geochemical Exploration , vol.80 , Issue.1 , pp. 55-68
    • Dold, B.1
  • 18
    • 22444444409 scopus 로고    scopus 로고
    • Mineralogical and geochemical characterization of arsenic in an abandoned mine tailings of Korea
    • DOI 10.1007/s10653-005-0121-8
    • J.S. Ahn, Y.S. Park, J.Y. Kim, and K.W. Kim Mineralogical and geochemical characterization of arsenic in an abandoned mine tailings of Korea Environ. Geochem. Health 27 2005 147 157 (Pubitemid 41007021)
    • (2005) Environmental Geochemistry and Health , vol.27 , Issue.2 , pp. 147-157
    • Ahn, J.S.1    Park, Y.S.2    Kim, J.-Y.3    Kim, K.-W.4
  • 19
    • 0033964544 scopus 로고    scopus 로고
    • Arsenic speciation: Involvement in evaluation of environmental impact caused by mine wastes
    • C. Roussel, H. Bril, and A. Fernandez Heavy metals in the environment. Arsenic speciation: involvement in evaluation of environmental impact caused by mine wastes J. Environ. Qual. 29 2000 182 188 (Pubitemid 30061191)
    • (2000) Journal of Environmental Quality , vol.29 , Issue.1 , pp. 182-188
    • Roussel, C.1    Bril, H.2    Fernandez, A.3
  • 20
    • 34548011257 scopus 로고    scopus 로고
    • Speciation and colloid transport of arsenic from mine tailings
    • DOI 10.1016/j.apgeochem.2007.03.053, PII S0883292707001266
    • A.J. Slowey, S.B. Johnson, M. Newville, and G.E. Brown Jr. Speciation and colloid transport of arsenic from mine tailings Appl. Geochem. 22 2007 1884 1898 (Pubitemid 47285650)
    • (2007) Applied Geochemistry , vol.22 , Issue.9 , pp. 1884-1898
    • Slowey, A.J.1    Johnson, S.B.2    Newville, M.3    Brown Jr., G.E.4
  • 21
    • 38149032489 scopus 로고    scopus 로고
    • Evaluation of various chemical extraction methods to estimate plant-available arsenic in mine soils
    • H.M. Anawar, A. Garcia-Sanchez, and I. Santa Regina Evaluation of various chemical extraction methods to estimate plant-available arsenic in mine soils Chemosphere 70 2008 1459 1467
    • (2008) Chemosphere , vol.70 , pp. 1459-1467
    • Anawar, H.M.1    Garcia-Sanchez, A.2    Santa Regina, I.3
  • 22
    • 71049193859 scopus 로고    scopus 로고
    • Tailings mineralogy and geochemistry at the abandoned Haveri Au-Cu mine, SW Finland
    • A. Parviainen Tailings mineralogy and geochemistry at the abandoned Haveri Au-Cu mine, SW Finland Mine Water Environ. 28 2009 291 304
    • (2009) Mine Water Environ. , vol.28 , pp. 291-304
    • Parviainen, A.1
  • 23
    • 16844382470 scopus 로고    scopus 로고
    • Arsenic readily released to pore waters from buried mill tailings
    • DOI 10.1016/j.apgeochem.2004.11.012
    • J. Mahoney, D. Langmuir, N. Gosselin, and J. Rowson Arsenic readily released to pore waters from buried mill tailings Appl. Geochem. 20 2005 947 959 (Pubitemid 40483262)
    • (2005) Applied Geochemistry , vol.20 , Issue.5 , pp. 947-959
    • Mahoney, J.1    Langmuir, D.2    Gosselin, N.3    Rowson, J.4
  • 24
    • 50149094639 scopus 로고    scopus 로고
    • Migration of arsenic from old tailings ponds - A case study on the King Edward Mine, Cornwall, UK
    • M.P. Beeston, J.T. van Elteren, Z. Slejkovec, and H.J. Glass Migration of arsenic from old tailings ponds - a case study on the King Edward Mine, Cornwall, UK Environ. Res. 108 2008 28 43
    • (2008) Environ. Res. , vol.108 , pp. 28-43
    • Beeston, M.P.1    Van Elteren, J.T.2    Slejkovec, Z.3    Glass, H.J.4
  • 25
    • 0034077392 scopus 로고    scopus 로고
    • Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California
    • DOI 10.1016/S0883-2927(99)00115-8, PII S0883292799001158
    • K.S. Savage, T.N. Tingle, P.A. O'Day, G.A. Waychunas, and D.K. Bird Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California Appl. Geochem. 15 2000 1219 1244 (Pubitemid 30347779)
    • (2000) Applied Geochemistry , vol.15 , Issue.8 , pp. 1219-1244
    • Savage, K.S.1    Tingle, T.N.2    O'Day, P.A.3    Waychunas, G.A.4    Bird, D.K.5
  • 26
    • 27844455891 scopus 로고    scopus 로고
    • Arsenic mobility in alteration products of sulfide-rich, arsenopyrite-bearing mine wastes, Snow Lake, Manitoba, Canada
    • DOI 10.1016/j.apgeochem.2005.06.007, PII S0883292705001514
    • K.A. Salzsauler, N.V. Sidenko, and B.L. Sherriff Arsenic mobility in alteration products of sulfide-rich, arsenopyrite-bearing mine wastes, Snow Lake, Manitoba, Canada Appl. Geochem. 20 2005 2303 2314 (Pubitemid 41653218)
    • (2005) Applied Geochemistry , vol.20 , Issue.12 , pp. 2303-2314
    • Salzsauler, K.A.1    Sidenko, N.V.2    Sherriff, B.L.3
  • 27
    • 30344443351 scopus 로고    scopus 로고
    • Landfill-stimulated iron reduction and arsenic release at the Coakley Superfund Site (NH)
    • DOI 10.1021/es051054h
    • J.L. Delemos, B.C. Bostick, C.E. Renshaw, S. Syryp, and X. Feng Landfill-stimulated iron reduction and arsenic release at the Coakley Superfund Site (NH) Environ. Sci. Technol. 40 2006 67 73 (Pubitemid 43069887)
    • (2006) Environmental Science and Technology , vol.40 , Issue.1 , pp. 67-73
    • DeLemos, J.L.1    Bostick, B.C.2    Renshaw, C.E.3    Sturup, S.4    Feng, X.5
  • 28
    • 77449113679 scopus 로고    scopus 로고
    • Geochemical and microbial effects on the mobilization of arsenic in mine tailing soils
    • K.Y. Lee, K.W. Kim, and S.O. Kim Geochemical and microbial effects on the mobilization of arsenic in mine tailing soils Environ. Geochem. Health 32 2010 31 44
    • (2010) Environ. Geochem. Health , vol.32 , pp. 31-44
    • Lee, K.Y.1    Kim, K.W.2    Kim, S.O.3
  • 29
    • 33748892719 scopus 로고    scopus 로고
    • Effects of oxalate and phosphate on the release of arsenic from contaminated soils and arsenic accumulation in wheat
    • DOI 10.1016/j.chemosphere.2006.04.039, PII S0045653506005017
    • Y.Q. Tao, S.Z. Zhang, W. Jian, C. Yuan, and X.Q. Shan Effects of oxalate and phosphate on the release of arsenic from contaminated soils and arsenic accumulation in wheat Chemosphere 65 2006 1281 1287 (Pubitemid 44427894)
    • (2006) Chemosphere , vol.65 , Issue.8 , pp. 1281-1287
    • Tao, Y.1    Zhang, S.2    Jian, W.3    Yuan, C.4    Shan, X.-q.5
  • 30
    • 78049275266 scopus 로고    scopus 로고
    • Electromigration of arsenic and co-existing metals in mine tailings
    • P. Isosaari, and M. Sillanpää Electromigration of arsenic and co-existing metals in mine tailings Chemosphere 81 2010 1155 1158
    • (2010) Chemosphere , vol.81 , pp. 1155-1158
    • Isosaari, P.1    Sillanpää, M.2
  • 31
    • 0026335049 scopus 로고
    • Effect of redox potential and pH on arsenic speciation and solubility in a contaminated soil
    • P.H. Masscheleyn, R.D. Delaune, and W.H. Patrick Jr. Effect of redox potential and pH on arsenic speciation and solubility in a contaminated soil Environ. Sci. Technol. 25 1991 1414 1419
    • (1991) Environ. Sci. Technol. , vol.25 , pp. 1414-1419
    • Masscheleyn, P.H.1    Delaune, R.D.2    Patrick Jr., W.H.3
  • 32
    • 67349096271 scopus 로고    scopus 로고
    • On the potential of biological treatment for arsenic contaminated soils and groundwater
    • S. Wang, and X. Zhao On the potential of biological treatment for arsenic contaminated soils and groundwater J. Environ. Manage. 90 2009 2367 2376
    • (2009) J. Environ. Manage. , vol.90 , pp. 2367-2376
    • Wang, S.1    Zhao, X.2
  • 33
    • 27744490954 scopus 로고    scopus 로고
    • Evaluation of electrokinetic remediation of arsenic-contaminated soils
    • S.O. Kim, W.S. Kim, and K.W. Kim Evaluation of electrokinetic remediation of arsenic-contaminated soils Environ. Geochem. Health 27 2005 443 453
    • (2005) Environ. Geochem. Health , vol.27 , pp. 443-453
    • Kim, S.O.1    Kim, W.S.2    Kim, K.W.3
  • 34
    • 56149094290 scopus 로고    scopus 로고
    • Electrolyte conditioning-enhanced electrokinetic remediation of arsenic-contaminated mine tailing
    • K. Baek, D.H. Kim, S.W. Park, B.G. Ryu, T. Bajargal, and J.S. Yang Electrolyte conditioning-enhanced electrokinetic remediation of arsenic-contaminated mine tailing J. Hazard. Mater. 161 2009 457 462
    • (2009) J. Hazard. Mater. , vol.161 , pp. 457-462
    • Baek, K.1    Kim, D.H.2    Park, S.W.3    Ryu, B.G.4    Bajargal, T.5    Yang, J.S.6
  • 35
    • 0032438285 scopus 로고    scopus 로고
    • Industrial site soils contaminated with arsenic or chromium: Evaluation of the electrokinetic method
    • I. Le Hcho, S. Tellier, and M. Astruc Industrial site soils contaminated with arsenic or chromium: evaluation of the electrokinetic method Environ. Technol. 19 1998 1095 1102 (Pubitemid 29022769)
    • (1998) Environmental Technology , vol.19 , Issue.11 , pp. 1095-1102
    • Le Hecho, I.1    Tellier, S.2    Astruc, M.3
  • 36
    • 0034523540 scopus 로고    scopus 로고
    • Electrodialytic remediation of an arsenic and copper polluted soil - Continuous addition of ammonia during the process
    • L.M. Ottosen, H.K. Hansen, G. Bech-Nielsen, and A. Villumsen Electrodialytic remediation of an arsenic and chromium polluted soil - continuous addition of ammonia during the process Environ. Technol. 21 2000 1421 1428 (Pubitemid 32051559)
    • (2000) Environmental Technology , vol.21 , Issue.12 , pp. 1421-1428
    • Ottosen, L.M.1    Hansen, H.K.2    Bech-Nielsen, G.3    Villumsen, A.4
  • 37
    • 57349118714 scopus 로고    scopus 로고
    • Electrokinetic remediation of wood preservative contaminated soil containing copper, chromium, and arsenic
    • P.R. Buchireddy, M. Brick, and D.B. Gent Electrokinetic remediation of wood preservative contaminated soil containing copper, chromium, and arsenic J. Hazard. Mater. 162 2009 490 497
    • (2009) J. Hazard. Mater. , vol.162 , pp. 490-497
    • Buchireddy, P.R.1    Brick, M.2    Gent, D.B.3
  • 38
    • 0346177689 scopus 로고
    • Mineralogy and metal distribution in the copper-tungsten deposit of Ylöjärvi, southwest Finland
    • R. Himmi, M. Huhma, and A. Häkli Mineralogy and metal distribution in the copper-tungsten deposit of Ylöjärvi, southwest Finland Econ. Geol. 74 1979 1183 1197
    • (1979) Econ. Geol. , vol.74 , pp. 1183-1197
    • Himmi, R.1    Huhma, M.2    Häkli, A.3
  • 39
    • 80051722881 scopus 로고    scopus 로고
    • Ylöjärven Paroistenjärven kaivosalueen nykytilan selvitys
    • Geological Survey, Finland, (in Finnish)
    • L. Carlson, P. Hänninen, H. Vanhala, Ylöjärven Paroistenjärven kaivosalueen nykytilan selvitys, Report S/41/0000/3/2002, Geological Survey, Finland, 2002 (in Finnish).
    • (2002) Report S/41/0000/3/2002
    • L. Carlson1
  • 42
    • 66649108590 scopus 로고    scopus 로고
    • Geochemical baselines in relation to analytical methods in the Itä-Uusimaa and Pirkanmaa regions, Finland
    • T. Tarvainen, J. Jarva, and H. Kahelin Geochemical baselines in relation to analytical methods in the Itä-Uusimaa and Pirkanmaa regions, Finland Geochem. Explor. Environ. Anal. 9 2009 81 92
    • (2009) Geochem. Explor. Environ. Anal. , vol.9 , pp. 81-92
    • Tarvainen, T.1    Jarva, J.2    Kahelin, H.3
  • 45
    • 0031814345 scopus 로고    scopus 로고
    • Quantitative arsenic speciation in mine tailings using X-ray absorption spectroscopy
    • A.L. Foster, G.E. Brown, T.N. Tingle, and G.A. Parks Quantitative arsenic speciation in mine tailings using X-ray absorption spectroscopy Am. Mineral. 83 1998 553 568 (Pubitemid 28388618)
    • (1998) American Mineralogist , vol.83 , Issue.5-6 , pp. 553-568
    • Foster, A.L.1    Brown Jr., G.E.2    Tingle, T.N.3    Parks, G.A.4
  • 46
    • 0036712218 scopus 로고    scopus 로고
    • Distribution of inorganic arsenic species in mine tailings of abandoned mines from Korea
    • M.J. Kim, K.H. Ahn, and Y.J. Jung Distribution of inorganic arsenic species in mine tailings of abandoned mines from Korea Chemosphere 49 2002 307 312
    • (2002) Chemosphere , vol.49 , pp. 307-312
    • Kim, M.J.1    Ahn, K.H.2    Jung, Y.J.3


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