The solubility of gypsum in organic acids namely acetic, oxalic, tartaric and

succinic acids at low temperature (3

BARUAH , M K

GOGOI , P C

KOTOKY , P

IR@NEIST - North East Institute of Science and Technology (CSIR)

  E-mail Article     Add to my Quick Links     Cited By in Scopus (10)   Related Articles in ScienceDirectView More Related Articles View Record in Scopus Login:  Register Home Browse My Settings Alerts Help Quick Search   All fields   Author   Journal/book title   Volume   Issue   Page         FuelVolume 79, Issue 2, January 2000, Pages 211-216 Font Size:   doi:10.1016/S0016-2361(99)00140-4    Copyright © 1999 Elsevier Science Ltd. All rights reserved.Short communicationSulphate behaviour from dissolution of gypsumin organic acidsM. K. Baruah, a, P. C. Gogoia and P.Kotokyba Department of Chemistry, NNS College,Titabar-785630, Assam, Indiab Geoscience Division, RegionalResearch Laboratory, Jorhat 785006,Assam, IndiaReceived 14 January 1999; revised 23 June 1999; accepted 28 June 1999Available online 24 November 1999.AbstractThe solubility of gypsum in organic acids namely acetic, oxalic, tartaric andsuccinic acids at low temperature (30°C) was studied. The results show thatsulphate sulphur content increases with increasing acid concentration from 0.1to 0.25 M and decreases again at higher concentration. It is suggested thatdifferent behaviour of the acids beyond 0.25 M solution could be due toincorporation of sulphate into the co-ordination sphere of calcium-organiccomplexes. It is suggested that the occurrence of free and fixed sulphate in thesolution is highly pH dependent. The nature of incorporation of sulphate in asystem containing calcium species and natural organic matter has also beenstudied. Humic acids, extracted from forest and tea-garden soils, were treatedwith a solution of gypsum (CaSO4·2H2O) at room temperature and the infraredspectra of the gypsum treated samples reveal that sulphate has beenincorporated into the calcium complex as a monodentate ligand. Further aninorganic-sulphur free high-sulphur coal when treated with the gypsum solution,incorporated sulphate as bidentate ligand. It is concluded that the nature of the Abstract Article Figures/Tables References  Purchase PDF (140 K)Article ToolboxThe nature of metals--sediment--water interactions in f...Earth-Science ReviewsChemical factors influencing the rates and sequences of...Geochimica et Cosmochimica ActaThe roles of organic matter in the formation of uranium...Ore Geology ReviewsThe role of humic acids from Tasmanian podzolic soils i...Geochimica et Cosmochimica ActaSome observations upon the natural history of GypsumProceedings of the Geologists' AssociationScienceDirect - Fuel : Sulphate behaviour from dissolution of gypsum in o... http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V3B...1 of 2 6/3/2009 3:18 PMorganic matter plays an important role for the occurrence of various fixedsulphates either as monodentate or bidentate ligand in natural systems. Thiswork is a novel breakthrough for the occurrence of varying sulphate content insome of the natural environments and has considerable environmental andgeochemical interest.Author Keywords: Gypsum; Solubility; Sulphate; Coordination; OrganicmatterArticle Outline1. Introduction2. Experimental3. Results and discussion3.1. Effect of organic acid on the extent of free sulphate formation3.2. Spectroscopic evidence of sulphate incorporation3.3. Effect of acidity in the system3.4. Sulphate behaviour in natural systemsAcknowledgementsReferences Corresponding authorSponsored LinksCopper SulphateReliable source, great qualityover 25000 tpa availabilitywww.cuso4.atElementarGerman High Tech Manufacturerof Elemental & TOC Analyzerswww.elementar.deSearching for ChemicalsFREE - More than 300.000 supplyreferences - search for FREEwww.Chemical-Suppliers.de Home Browse My Settings Alerts HelpAbout ScienceDirect  |  Contact Us  |  Information for Advertisers  |  Terms & Conditions  |  Privacy PolicyCopyright © 2009 Elsevier B.V. All rights reserved. ScienceDirect® is a registered trademark of Elsevier B.V.FuelVolume 79, Issue 2, January 2000, Pages 211-216ScienceDirect - Fuel : Sulphate behaviour from dissolution of gypsum in o... http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V3B...2 of 2 6/3/2009 3:18 PM

Sulphate behaviour from dissolution of gypsum in organic acids

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Sulphate behaviour from dissolution of gypsum in organic acids

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