INTERPRETATION OF OXYGEN –18 ISOTOPE IN SULPHATE FROM DEEP GROUNDWATER IN JAKARTA AREA

https://doi.org/10.22146/ijc.21709

E. Ristin Pujiindiyati(1*), Wandowo Wandowo(2), Zainal Abidin(3)

(1) Centre for the Application Technology of Isotopes and Radiation, National Nuclear Energy Agency, Jl. Cinere, Pasar Jumat, PO.Box 7002 JKSKL, Jakarta 12070
(2) Centre for the Application Technology of Isotopes and Radiation, National Nuclear Energy Agency, Jl. Cinere, Pasar Jumat, PO.Box 7002 JKSKL, Jakarta 12070
(3) Centre for the Application Technology of Isotopes and Radiation, National Nuclear Energy Agency, Jl. Cinere, Pasar Jumat, PO.Box 7002 JKSKL, Jakarta 12070
(*) Corresponding Author

Abstract


It has been done a determination of d 18O (SO42-) and d 18O (H2O) value from Jakarta deep groundwater with depth 40-140 m. The aim of this research is to know some procesess influencing the composition of oxygen isotope in groundwater sulphate. A method commonly used to determine d 18O (H2O) value is according to Epstein-Mayeda. CO2 gas resulted from   equilibration process between water sample and CO2 gas standard in which oxygen isotopic reaction has occurred, is injected to mass spectrometer. For determination of d 18O (SO42-) value, Rafter method is used. CO2 gas released from reducing sulphate of water sample with graphite is injected to mass spectrometer. The results of d 18O (H2O) values obtained in this experiment have a narrow range from  -5,04 0/00 to  -6,65 0/00 SMOW whereas their d18O (SO42-) values have a wider range from +8,3 0/00 to +17,4 0/00 SMOW.  The more constant values of d 18O (H2O) performed that evaporation effects might not occur.  Based on the similarity between d18O (SO42-) values of deep groundwater and that of marine evaporite sulphate rocks, it is supposed that sulphate of Jakarta deep groundwater was derived from dissolution of this rocks. There was an indication of seawater intrusion around Pejagalan and Kamal Muara Penjaringan area based on the similarity between their d18O (SO42-) values and d18O (SO42-) of modern seawater.  The contribution of oxygen from water in sulphide oxidation reaction ranged 0% to 12% suggesting that oxygen in deep groundwater sulphate was mainly derived from atmospheric molecular oxygen.


Keywords


oxygen isotope; sulphate; groundwater

Full Text:

Full Text PDF


References

[1]   Clark, I and Fritz, P., 1997, Groundwater Quality in Environmental Isotopes in Hydrogeology, Lewis  Publishers, Boca-Ratan-New York, 137

[2]   Krouse, HR and Van Everdingen, R, 1985, Nature, 315, 395-396   

[3]    Hoefs, J., 1980, Stable Isotope Geochemistry,  Springer-Verlag, Berlin, 18.        

[4]   Leone G, Ricchiuto TE and Longinelli A, 1987, Proceedings of an Advisory Group Meeting at 17-20 June 1985, International Atomic Energy Agency, Vienna, 5-14

[5]   IAEA,1981, Deuterium and Oxygen-18 in water cycle in Stable Isotope in Hydrology-Technical Report Series 210, International Atomic Energy Agency, Vienna, 103

[6]   Krouse, HR., 1987, Proceeding of an Advisory Group Meeting at 17-20 June 1985, International Atomic Energy Agency , Vienna,19-20

[7]   Rafter, TA ., 1967, New Zealand J. Sci.,10, 493-510

[8]   Epstein, S and Mayeda, TK.,1959, Geochim.Cosmochim Acta, 4, 10, 213-224

[9]   Wandowo, 2000, Laporan Akhir Riset Unggulan Terpadu V Bidang Teknologi  Perlindungan Lingkungan 1997-2000, Kantor Menteri Riset dan Teknologi - Dewan Riset Nasional.

[10] Dinas Geologi dan Tata Lingkungan, 1994, Dinas Pertambangan  DKI Jakarta, Jakarta.

[11] Taylor, BC., Wheeler, MC., and Nordstorm, DK, 1984, Nature, 308, 538-541



DOI: https://doi.org/10.22146/ijc.21709

Article Metrics

Abstract views : 318 | views : 375


Copyright (c) 2010 Indonesian Journal of Chemistry

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

 


Indonesian Journal of Chemisty (ISSN 1411-9420 / 2460-1578) - Chemistry Department, Universitas Gadjah Mada, Indonesia.

Web
Analytics View The Statistics of Indones. J. Chem.