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Tytuł pozycji:

Iodine-129 for determining the origin of salinity in groundwater in Pampanga, Philippines.

Tytuł :
Iodine-129 for determining the origin of salinity in groundwater in Pampanga, Philippines.
Autorzy :
Tan SPV; Environmental Engineering Program, University of the Philippines, Quezon City, 1101, Philippines. Electronic address: .
Bautista AT VII; Department of Science and Technology - Philippine Nuclear Research Institute (DOST-PNRI), Quezon City, 1101, Philippines.
Mendoza NDS; Department of Science and Technology - Philippine Nuclear Research Institute (DOST-PNRI), Quezon City, 1101, Philippines.
Racadio CDT; Department of Science and Technology - Philippine Nuclear Research Institute (DOST-PNRI), Quezon City, 1101, Philippines.
Puthenpurekal M; Department of Environment and Natural Resources - Mines and Geosciences Bureau (DENR-MGB), Quezon City, 1100, Philippines.
Resurreccion AC; Environmental Engineering Program, University of the Philippines, Quezon City, 1101, Philippines.
Matsuzaki H; Micro Analysis Laboratory, Tandem Accelerator (MALT), University of Tokyo, Bunkyo-ku, 113-8654, Japan.
Pokaż więcej
Źródło :
Journal of environmental radioactivity [J Environ Radioact] 2020 Jul; Vol. 218, pp. 106239. Date of Electronic Publication: 2020 Apr 01.
Typ publikacji :
Journal Article
Język :
English
Imprint Name(s) :
Original Publication: Barking, Essex : Elsevier Applied Science Publishers,
MeSH Terms :
Groundwater*
Radiation Monitoring*
Iodine Radioisotopes/*analysis
Water Pollutants, Radioactive/*analysis
Environmental Monitoring ; Philippines ; Salinity ; Seawater
Contributed Indexing :
Keywords: AMS; Groundwater salinity; Iodine129; Isotope tracer
Substance Nomenclature :
0 (Iodine Radioisotopes)
0 (Water Pollutants, Radioactive)
Entry Date(s) :
Date Created: 20200519 Date Completed: 20200717 Latest Revision: 20200717
Update Code :
20201023
DOI :
10.1016/j.jenvrad.2020.106239
PMID :
32421573
Czasopismo naukowe
Assessing groundwater vulnerability from salinity contamination is vital and relevant to meet the increasing demand for freshwater. Iodine-129 ( 129 I, half-life = 15.7 million years), a radioisotope of iodine, was used as an environmental tracer for the possible origin of salinization in groundwater (e.g., natural rock weathering, evaporated water, seawater, brine fossil water, contamination). In July 2017 (wet season), thirty-two (32) water samples were taken from production wells of different localities in Pampanga, a province in the Philippines that relies heavily on groundwater for freshwater sources. Hydrogeochemical (mainly Cl) and stable water isotopes (δ 2 H and δ 18 O) were able to identify seven samples potentially affected by seawater intrusion. The salinity origin of these samples was investigated using iodine-129 and iodine-127 isotopes by generating two graphs: 129 I vs. chloride and 129 I/ 127 I ratio vs. 1/ 127 I. 129 I vs. Cl graph was capable of showing a clear distinction between different salinity origins. Five out of the seven samples were being affected by evaporated water, one sample from possible wastewater, and one sample from brine fossil water. A conceptual model was produced to summarize the results. Compiled end-members (e.g., natural brine, seawater, modern rain) were plotted in the 129 I/ 127 I ratio vs. 1/ 127 I graph to show the interaction between two recharge sources. The results of this study will be helpful to the government, civil society, and other organizations for monitoring, policymaking, and management of the groundwater and the subsurface formations that will be crucial to continuously supply the freshwater needs of the present and future generation.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)

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