Factor analysis was applied to the hydrochemical data set of Manukan Island in order to extract the principal factors corresponding to the different sources of variation in the hydrochemistry. The application of varimax rotation was to ensure the clear definition of the main sources of variation in the hydrochemistry. The geochemical data of dissolved major, minor and trace constituents in the groundwater samples indicates the main processes responsible for the geochemistry evolution. By using Kaiser normalization, principal factors were extracted from the data for each location. The analysis reveals that there are four sources of solutes: (1) seawater intrusion; (2) leaching process of underlying rock mediated by pH; (3) minerals weathering process and (4) dissolution of carbonate minerals characterized by high loadings of Ca, Zn and Mg. Such processes are dominated by the significant role of anthropogenic impact from the over abstraction of fresh water from the aquifer. Those factors contributed to the changes of the groundwater geochemistry behavior explain the effect of rising extraction of freshwater from the aquifer.
Abdullah, M. H.; Aris, A. Z., (2005). Groundwater Quality of Sipadan Island, Sabah: Revisited. Proceedings of the2nd Regional Symposium on Environment and Natural Resources., , 254-257 (4 Pages)Abstract
2.
Abdullah, M. H.; Kassim, M. A.; Hanapi, M. N., (2002). Saltwater encroachment into the sandy aquifer of Manukan Island, Sabah. Borneo Sci., 12, 1-22 (22 Pages)
3.
Abdullah, M. H.; Mokhtar, M. B.; Tahir, S.; Awaluddin, A., (1997b). Do tides affect water quality in the upper phreatic zone of a small oceanic island, Sipadan Island, Malaysia?. Environ. Geo., 29, 112-117 (6 Pages), DOI: 10.1007/s002540050109. Abstract | Full Text (276 K)
4.
Abdullah, M. H.; Musta, B., (1999). Phreatic water quality of the turtle islands of East Malaysia: Pulau Selingaan and Pulau
Bakkungan Kechil. Borneo Sci., 6 (1-9)
5.
Abdullah, M. H.; Musta, B.; Aris, A. Z.; Annamala, K., (2004). Groundwater Resources of Mabul Island, Semporna, Sabah: Quality Monitoring And Management. Proceedings of the 2nd. International Conference on Water and Wastewater Management and Technologies , 117-120 (4 Pages)
6.
Abdullah, M. H.; Musta, B.; Tan, M. M., (1997a). A Preliminary Geochemical Study on Manukan Island, Sabah.. Borneo Sci., 3, 43-51 (9 Pages)
7.
APHA, (1995). Standard Methods for the Examination of
Water and Wastewater.. 19th. Ed. American Water Works Association, Water Environment Federation, Washington,
8.
Appelo, C. A. J.; Postma, D., (2005). Geochemistry, Groundwater and Pollution. 2nd. Ed. Balkema, Rotterdam, Abstract
9.
Aris, A. Z.; Abdullah, M. H.; Musta, B., (2007). Hydrochemical analysis on groundwater in shallow aquifer of Manukan and Mabul islands, Malaysia. IAHS Red Book, Abstract
10.
Basir, J.; Sanudin, T.; Tating, F. F., (1991). Late Eocene planktonic foraminifera from the Crocker Formation, Pun Batu, Sabah. Warta Geo., 14 (4), 1-15 (15 Pages)
11.
Bear, J.; Cheng, A. H. D.; Sorek, S.; Ouazar, D.; Herrera, I., (1999). Seawater intrusion in coastal aquifers – Concepts, Methods and Practices. Kluwer Academic, Dordretch, The Netherlands., Abstract
12.
Darmayati, Y.; Hindarti, D.; Sulistijo., (1999). Asean Marine Water Chemistry for Chromium (Hexvalent). Asean-Canada CPMS-II, March.,
13.
Davis, J. C., (1986). Statistics and data analysis in geology. 2nd. Ed, John Willey and Sons, New York.,
14.
Gallardo, A. H.; Marui, A., (2007). Modeling the dynamics of the freshwater-saltwater interface in response toconstruction activities at a coastal site.. Int. J. Environ.Sci. Tech., 4 (3), 285-294 (10 Pages)Abstract | Full Text (408 K)
15.
Gimenez, E.; Morell, I., (1997). Hydrochemical analysis of salinization processes in the coastal aquifer of Oropesa, Castellon, Spain. Environ. Geo., 29 (1-2), 118-131 (14 Pages), DOI: 10.1007/s002540050110. Abstract | Full Text (435 K)
16.
Hem, J. D., (1989). Study and interpretation of the chemical
characteristics of natural water (3rd. Ed). U.S. GeologicalSurvey Water-Supply Paper # 2254., 363.
17.
Karbassi, A. R., (1998). Geochemistry of Ni, Zn, Cu, Pb,Co, Cd, V, Mn, Fe, Al and Ca in sediments of North Western
part of the Persian Gulf. Int. J. Env. Stud., 54 (3), 205-212 (8 Pages), DOI: 10.1080/00207239808711153. Abstract | Full Text
18.
WHO, (2004). Guideliness for Drinking-water quality. Volume 1 Recommendations 3rd. Ed. World Health Organization, Geneva.,
19.
Wittman, G. T. W., (1979). Metal pollution in the marine environment. Chapter G: Trace metals in water purification processes., , 324-360 (37 Pages)