Notes on salt water intrusion and trace element distribution in Metro Manila [Philippines] groundwaters
1984
Santos, G. Jr. | Ramos, A.F. | Fernandez, L.G. | Almoneda, R.V. | Garcia, T.Y. | Cruz, C.C. | Petrache, C.A. | Andal, T.T. | Alcantara, E. (Philippines. Department of Science and Technology, Bicutan, Taguig, Metro Manila. Philippine Nuclear Research Inst.)
Preliminary analyses of water for uranium and other trace elements from deepwells operated by the Metropolitan Waterworks and Sewerage System (MWSS) in Metro Manila [Philippines] were performed. Uranium, which ranged from 0.2 ppb to 6 ppb, was correlated with saltwater intrusion. Values greater or equal to 0.8 ppb for Uranium were considered indicative of saline water intrusion in the aquifers. Saline water intrusions in Malabon, Navotas, Paranaque, Las Pinas, Bacoor, Imus, Kawit, Pasig, Antipolo, San Mateo, Taguig, Cainta, Taytay, Alabang, and Muntinlupa [Philippines] were noted. Most of these areas were also identified by MWSS as being affected by saltwater intrusion. Tritium values ranged from 0 (below detection limits) to 44 tritium limits. Except for one well in Muntinlupa, all the values obtained were below the lower limit of detection of 30.83 T.U. Mercury contents in six well locations had values above the maximum limit set by the National Standards for Drinking water. Four wells exceeded the permissible level for Manganese while two wells had Iron concentrations greater than the National Standards. Other trace element concentrations such as Cr, Pb, Zn, Co, and Ni did not exceed their permissible levels or were not included in the National Standards.
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