Chin Yik Lin

Publications (6) View all

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  Article: Geochemical processes, evidence and thermodynamic behavior of dissolved and precipitated carbonate minerals in a modern seawater/freshwater mixing zone of a small tropical island

  Chin Yik Lin, Baba Musta, Mohd Harun Abdullah
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  ABSTRACT: a b s t r a c t The geochemical processes and thermodynamic behavior of dissolved and precipitated carbonate miner-als controlling the hydrochemistry of an aquifer in the seawater/freshwater mixing zone of a small island are identified. Field and laboratory analyses, geochemical modeling (PHREEQC) and multivariate statisti-cal analysis (MSA) provide a quantitative interpretation for the geochemistry of the carbonate-dominated aquifer. Geochemical analyses and modeling results show that dissolution and re-precipitation of CaCO 3 are the prevalent processes governing geochemical reactions in the mixing zone. Furthermore, this was confirmed by coherent statistical output that incorporates Principle Component Analysis (PCA) and k-means Cluster Analysis (k-CA). Generally, the composition of the lowland sandy soil was rather homoge-neous and was primarily composed of quartz, aragonite, calcite and Mg-calcite. Thermodynamic model calculations indicate that the carbonate minerals calcite, aragonite and dolomite are supersaturated in the mixing zone. Nevertheless, Powder X-ray Diffraction (PXRD) and Scanning Electron Microscope (SEM) examination verified the occurrence of low-Mg-calcite (LMC) and the absence of dolomite, attrib-uted to thermodynamic/kinetic hindrance, cation disorder and the presence of dolomite crystal growth rate inhibitors (such as SO 4). The results suggest that dissolution of aragonite and precipitation of LMC drives the solid phase geochemistry in the small tropical island aquifer.
  Applied Geochemistry 02/2013; 29:13 - 31. · 2.18 Impact Factor
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  Article: Stability Behavior and Thermodynamic States of Iron and Manganese in Sandy Soil Aquifer, Manukan Island, Malaysia

  Chin Yik Lin, Mohd. Harun Abdullah, Baba Musta, Sarva Mangala Praveena, Ahmad Zaharin Aris
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  ABSTRACT: A total of 20 soil samples were collected from 10 boreholes constructed in the low lying area, which included ancillary samples taken from the high elevation area. Redox processes were investigated in the soil as well as groundwater in the shallow groundwater aquifer of Manukan Island, Sabah, Malaysia. Groundwater samples (n=10) from each boreholes were also collected in the low lying area to understand the concentrations and behaviors of Fe and Mn in the dissolved state. This study strives to obtain a general understanding of the stability behaviors on Fe and Mn at the upper unsaturated and the lower-saturated soil horizons in the low lying area of Manukan Island as these elements usually play a major role in the redox chemistry of the shallow groundwater. Thermodynamic calculations using PHREEQC showed that the groundwater samples in the study area are oversaturated with respect to goethite, hematite, Fe(OH)3 and undersaturated with respect to manganite and pyrochroite. Low concentrations of Fe and Mn in the groundwater might be probably due to the lack of minerals of iron and manganese oxides, which exist in the sandy aquifer. In fact, high organic matters that present in the unsaturated horizon are believed to be responsible for the high Mn content in the soil. It was observed that the soil samples collected from high elevation area (BK) comprises considerable amount of Fe in both unsaturated (6675.87mg/kg) and saturated horizons (31440.49mg/kg) compared to the low Fe content in the low lying area. Based on the stability diagram, the groundwater composition lies within the stability field for Mn2+ and Fe2+ under suboxic condition and very close to the FeS/Fe2+ stability boundary. This study also shows that both pH and Eh values comprise a strong negative value thus suggesting that the redox potential is inversely dependent on the changes of pH. KeywordsStability behaviors–small island–groundwater thermodynamic states–redox-sensitive minerals–stability diagrams–PHREEQC
  Natural Resources Research 04/2012; 20(1):45-56.
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  Article: Delineation of temporal variability and governing factors influencing the spatial variability of shallow groundwater chemistry in a tropical sedimentary island

  Yik Chin, Lin, Mohd Harun Abdullah, Mangala Sarva, Praveena, Aminatul Hawa, Bt Yahaya, Baba Musta
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  ABSTRACT: s u m m a r y An attempt has been made to delineate the temporal variability and factors governing the shallow groundwater chemistry using analysis of variance (ANOVA) and multivariate analysis notably R-mode factor (FA) and hierarchical cluster analysis (HCA). Subsequently, geostatistical isoplethic maps were applied to convey better understanding on the distribution of selected groundwater parameters. The Manukan Island's shallow aquifer with sedimentary setting that constantly abstracted for freshwater supply has been selected for this study. One-way ANOVA suggested that neither changes of tide level nor rainfall volume appeared to exert significant influence on the groundwater chemistry of the small island. Rather, the groundwater chemistry was greatly governed by influence from seawater intrusion, which characterized by considerable amount of Ca, Na, and Cl. Such condition was well explained by a Piper diagram, where most plots were situated at the middle diamond shaped diagram, indicating mixing condition. FA likewise revealed that the shallow groundwater receives marked influence from carbonate dissolution and silicate weathering processes, especially boreholes located in the inland area. This can be clearly noted from the distinct groupings of relationships among different factors. HCA classified bore-holes into three groups according to their locations in the coastal area, suggesting significant chemical variations between boreholes with distance from coast. Such distribution pattern was particularly evi-dent in the isoplethic map. Overall, it appears that the shallow groundwater in the tropical island is not an appropriate source for drinking water in concern to its exceptionally high salinity and several ele-vated minor elements (Mn, Pb, and Se). For this, it is suggested that efforts in exploring other alternative sources should be performed outright.
  Journal of Hydrology 03/2012; 432-433:26. · 2.66 Impact Factor
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  Article: Assessment of Selected Chemical and Microbial Parameters in Groundwater of Pulau Tiga, Sabah, Malaysia

  Taksiran, Parameter Kimia, Dan Mikrob, Terpilih Bagi, Air Bawah, Tanah Di, Pulau Tiga, Malaysia ) Sabah, Yik Chin, Lin, Mohd Harun, Baba Musta, Ahmad Zaharin, Aris, Sarva, Mangala Praveena
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  ABSTRACT: Ambient groundwater samples collected from five wells in Pulau Tiga have been studied for selected physico-chemical and biological parameters to understand general water quality of the island. This preliminary study on groundwater of Pulau Tiga was undertaken to provide guidance and baseline data for future references. Two field works were undertaken in August and November 2007 to collect the groundwater samples. Groundwater samples were collected from five representatives wells at the low lying area of Pulau Tiga in order to study the in-situ parameters such as DO (dissolved oxygen), EC (electrical conductivity), TDS (total dissolved solids), pH, salinity and temperature. In general, groundwater in Pulau Tiga is moderate in conductivity (330 µS/cm – 1005 µS/cm), and serves as a vital freshwater source to both tourists and local inhabitants. However, bacteriological analysis showed that the groundwater quality was poor, with fecal coliform counts exceeding the WHO permissible limits for drinking water. Through this study, human factor was to be blame for the fecal contamination coliform where the polluted ground water might be originated from sanitation facilities located too close to the wells. The occurrence of total and fecal coliform bacteria in counts suggests poor sanitary handling and warns of the potential presence of disease-causing organisms. ABSTRAK Sampel air bawah tanah telah diambil dari lima buah perigi di Pulau Tiga bagi mengkaji parameter fizikokimia serta biologi terpilih untuk memahami kualiti air secara umum di pulau tersebut. Penyelidikan perintis air bawah tanah di Pulau Tiga telah dijalankan untuk menyediakan satu garis panduan serta data asas untuk rujukan masa depan. Dua kerja persampelan telah diadakan pada Ogos dan November 2007 bagi mengambil sampel air bawah tanah. Sampel-sampel air bawah tanah telah diambil dari lima buah perigi di Pulau Tiga untuk memahami parameter in-situ air tanah seperti DO (oksigen terlarut), EC (kekonduksian elektrik), TDS (jumlah pepejal terlarut), pH, kemasinan dan suhu. Secara umum, air tanah di Pulau Tiga adalah sederhana daripada segi kekonduksiannya (330 µS/cm – 1005 µS/cm)
  Sains Malaysiana 01/2010; 39:337-345. · 0.27 Impact Factor
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  Article: Groundwater Assessment at Manukan Island, Sabah: Multidisciplinary Approaches

  S M Praveena, C Y Lin, A Z Aris, M H Abdullah
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  ABSTRACT: A rapid increase in the number of tourists has placed a heavy demand for freshwater on Manukan Island, a small island located offcoast of Kota Kinabalu, Sabah. Hydrochemical and numerical approaches have been applied in this study to evaluate the groundwater quality of unconfined aquifer lying in Manukan Island, Sabah, East Malaysia. This is vital to enhance better understanding about groundwater management. Hydrochemical analysis output indicated NaCl water type in sampling locations. Seawater intrusion is marked by its relatively high Na + , Mg 2+ , Cl À and SO 4 2À concentrations. Hydrochemical analysis output clearly showed the influence of seawater in groundwater of Manukan Island. The numerical model output proved the influence of seawater in groundwater of Manukan Island by indicating the upconing process at the beneath of the pumping well. Current status of sea-water intrusion in Manukan Island is about 14.6% of freshwater and seawater mixing ratio in low lying area of Manukan Island as simulated by SEAWAT-2000 model output. Numerical model SEAWAT-2000 output showed clearly that the upconing process is the possible route of seawater to influence the fresh groundwater aquifer chemistry in Manukan Island. The results have enhanced the current understanding of seawater intrusion in the study area. Future studies will focus on using numerical models to simulate and suggest suitable groundwater management plans in Manukan Island.
  Natural Resources Research 01/2010; 19(4):279.