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Hydrogeochemistry of shallow aquifer Manukan Island, Sabah

A total of 180 shallow groundwater samples in Manukan island’s aquifer were collected for major and trace elements analysis in order to obtain a general understanding of the hydrogeochemistry in the study area. Groundwater and soil samples were collected in the low elevation area of the island to ev...

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Main Author: Lin, Chin Yik
Format: Thesis
Language:English
English
Published: 2011
Subjects:
QE500-639.5 Dynamic and structural geology
Online Access:https://eprints.ums.edu.my/id/eprint/43011/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/43011/2/FULLTEXT.pdf
https://eprints.ums.edu.my/id/eprint/43011/
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spelling my.ums.eprints.430112025-03-04T01:45:32Z https://eprints.ums.edu.my/id/eprint/43011/ Hydrogeochemistry of shallow aquifer Manukan Island, Sabah Lin, Chin Yik QE500-639.5 Dynamic and structural geology A total of 180 shallow groundwater samples in Manukan island’s aquifer were collected for major and trace elements analysis in order to obtain a general understanding of the hydrogeochemistry in the study area. Groundwater and soil samples were collected in the low elevation area of the island to evaluate the general chemical composition of groundwater and soil, hydrogeochemical facies in the natural shallow aquifer as well as the mineralogy of the soil in the aquifer. A total of 10 boreholes were installed perpendicularly from the shoreline towards inland of the island. Different layer (O, A, E, B and C zone) of soil samples were collected from the soil core during coring process. For water samples analysis, in situ readings were recorded in the field. Chemical parameters such as chloride (Cl-), bicarbonate (HCO3-), calcium (Ca2+), magnesium (Mg2+), sodium (Na+) and potassium (K+) were analysed in the laboratory. For mineralogy analysis, soil samples were pulverized and sieved prior to X-ray diffraction (XRD) and X-ray Florescence (XRF) analysis. Visual verification of these minerals were obtained from the images captured by scanning electron microscopy (SEM). Measurements of the soil’s loss on ignition (L.O.I.) and total metals in the soil samples were also included in the results, respectively. The results indicate that the groundwater collected from the boreholes were moderately mineralized with EC ranged from 460 μS/cm to 3400 μS/cm. The previous indiscriminate pumping activities had led to seawater intrusion into the aquifer. This study shows that the groundwater were generally classified as Ca-HCO3, CaCl2, NaHCO3 and NaCl water type as illustrated in the Piper diagrams. This study also found that the PHREEQC calculations were in agreement with the soil geochemical composition data. The PHREEQC calculations for calcite, aragonite and dolomite solubility revealed positive values in the saturation indices (SI), indicating supersaturated state i.e. precipitation shall occur with respect to these minerals. The baseline geochemical results clearly revealed that the major chemical composition of the soil in the study area was mainly composed of quartz, calcite, aragonite as well as magnesium calcite. XRF analysis depicts a general trend where the soil chemical composition varies significantly with depth and distance from shore. The composition of calcium oxides increases with depth. Conversely, silicon oxide showed a decreasing trend in composition with increasing depth which dominated by carbonates minerals. SEM images visually showed the presence of quartz, calcite and aragonite minerals in the soil samples and further supports the data obtained from XRD. 2011 Thesis NonPeerReviewed text en https://eprints.ums.edu.my/id/eprint/43011/1/24%20PAGES.pdf text en https://eprints.ums.edu.my/id/eprint/43011/2/FULLTEXT.pdf Lin, Chin Yik (2011) Hydrogeochemistry of shallow aquifer Manukan Island, Sabah. Masters thesis, Universiti Malaysia Sabah.
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
language English
English
topic QE500-639.5 Dynamic and structural geology
spellingShingle QE500-639.5 Dynamic and structural geology
Lin, Chin Yik
Hydrogeochemistry of shallow aquifer Manukan Island, Sabah
description A total of 180 shallow groundwater samples in Manukan island’s aquifer were collected for major and trace elements analysis in order to obtain a general understanding of the hydrogeochemistry in the study area. Groundwater and soil samples were collected in the low elevation area of the island to evaluate the general chemical composition of groundwater and soil, hydrogeochemical facies in the natural shallow aquifer as well as the mineralogy of the soil in the aquifer. A total of 10 boreholes were installed perpendicularly from the shoreline towards inland of the island. Different layer (O, A, E, B and C zone) of soil samples were collected from the soil core during coring process. For water samples analysis, in situ readings were recorded in the field. Chemical parameters such as chloride (Cl-), bicarbonate (HCO3-), calcium (Ca2+), magnesium (Mg2+), sodium (Na+) and potassium (K+) were analysed in the laboratory. For mineralogy analysis, soil samples were pulverized and sieved prior to X-ray diffraction (XRD) and X-ray Florescence (XRF) analysis. Visual verification of these minerals were obtained from the images captured by scanning electron microscopy (SEM). Measurements of the soil’s loss on ignition (L.O.I.) and total metals in the soil samples were also included in the results, respectively. The results indicate that the groundwater collected from the boreholes were moderately mineralized with EC ranged from 460 μS/cm to 3400 μS/cm. The previous indiscriminate pumping activities had led to seawater intrusion into the aquifer. This study shows that the groundwater were generally classified as Ca-HCO3, CaCl2, NaHCO3 and NaCl water type as illustrated in the Piper diagrams. This study also found that the PHREEQC calculations were in agreement with the soil geochemical composition data. The PHREEQC calculations for calcite, aragonite and dolomite solubility revealed positive values in the saturation indices (SI), indicating supersaturated state i.e. precipitation shall occur with respect to these minerals. The baseline geochemical results clearly revealed that the major chemical composition of the soil in the study area was mainly composed of quartz, calcite, aragonite as well as magnesium calcite. XRF analysis depicts a general trend where the soil chemical composition varies significantly with depth and distance from shore. The composition of calcium oxides increases with depth. Conversely, silicon oxide showed a decreasing trend in composition with increasing depth which dominated by carbonates minerals. SEM images visually showed the presence of quartz, calcite and aragonite minerals in the soil samples and further supports the data obtained from XRD.
format Thesis
author Lin, Chin Yik
author_facet Lin, Chin Yik
author_sort Lin, Chin Yik
title Hydrogeochemistry of shallow aquifer Manukan Island, Sabah
title_short Hydrogeochemistry of shallow aquifer Manukan Island, Sabah
title_full Hydrogeochemistry of shallow aquifer Manukan Island, Sabah
title_fullStr Hydrogeochemistry of shallow aquifer Manukan Island, Sabah
title_full_unstemmed Hydrogeochemistry of shallow aquifer Manukan Island, Sabah
title_sort hydrogeochemistry of shallow aquifer manukan island, sabah
publishDate 2011
url https://eprints.ums.edu.my/id/eprint/43011/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/43011/2/FULLTEXT.pdf
https://eprints.ums.edu.my/id/eprint/43011/
_version_ 1825809974632120320
score 13.244413

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