Feona Isidore - Academia.edu (original) (raw)

Papers by Feona Isidore

Research paper thumbnail of Hydrology of Acidic Mine Pit Lake: A Case Study of ex-Copper mine Pit Lake, Mamut, Sabah Malaysia

IOP conference series, Nov 1, 2022

Hydrological study of pit lake was carried out in ex-Mamut Copper Mine (MCM), Ranau Sabah. Gaugin... more Hydrological study of pit lake was carried out in ex-Mamut Copper Mine (MCM), Ranau Sabah. Gauging stations were established to measure surface inflows and outflows of the pit lake. Each station was equipped with a continuous water level recorder to record water level data at 10 ̶ minutes intervals. Rainfall and evaporation were measured respectively using storage gauge and evaporation pan. Over the entire study period, surface inflow accounted for 32.11% of the water entering the lake, the rest being provided by direct precipitation on the lake surface. Surface outflow discharges 53.13% of the water from the lake. Evaporation from the lake contributed 30.10% of water loss to the atmosphere. Changes of storage ranged from 61.09 mm to 241.56 mm per month. Simple linear regression analysis showed that, changes in lake level can be explained through rainfall and resulting tributary inflows, rate of surface outflow and evaporation, which would allow projections of possible future levels to be made by analysis of these components.

Research paper thumbnail of Mass Balance and Dissolved Metal Loads in the Mamut Copper Mine Temporary Settling Pond

IOP Conference Series: Earth and Environmental Science

Mining activities which involve certain sulphide bearing minerals generally produce acid mine dra... more Mining activities which involve certain sulphide bearing minerals generally produce acid mine drainage. The understanding of the characteristics of dissolved metals before they are discharged into streams is important for environmental management. This study focuses on a small water reservoir in the former Mamut Copper Mine, known locally as the Temporary Settling Pond (TSP). The main objective of this study is to estimate the mass balance and load of dissolved metals in the acid mine drainage (from the mine pit to the TSP). Water sampling and discharge measurements were done during baseflow and high flows using water level sensors and dataloggers. The analysis of dissolved elements in water samples was done using ICP-OES, while sulphate was analysed using a ‘HACH’ spectrometer kit. Through the mass balance method, Fe had the highest removal rate followed by Cu, Al, Zn and Mn. The highest dissolved metal load discharged from the TSP was Al followed by Mn, Cu, Zn and Fe.

Research paper thumbnail of Distance impacts toxic metals pollution in mining affected river sediments

Research paper thumbnail of Water quality status of Liwagu River, Tambunan, Sabah, Malaysia

A study on water quality at selected sites along the two main tributaries of Liwagu River was car... more A study on water quality at selected sites along the two main tributaries of Liwagu River was carried out. Eight water samples were collected along the river for physical and chemical analysis. The physical and chemical water quality analyses were carried out according to APHA procedures. The result of water quality analysis (physico- chemical) indicated that both of the tributaries are characterised by excellent water quality with an average of 94.5 value of WQI. This river was classified into Class I - Class II based on National Water Quality Standards for Malaysia (NWQSM) and the Water Quality Index (WQI).

Research paper thumbnail of A Pristine Water Quality of Repeatedly Logged Forest River in Kawag Forest Area, Ulu Segama Malua Forest Reserve, Sabah

Transactions on Science and Technology, 2019

Water chemistry of Kawag Forest Area was studied based on the major ion chemistry and in-situ wat... more Water chemistry of Kawag Forest Area was studied based on the major ion chemistry and in-situ water quality parameters. The sampling stations were selected in two streams of Kawag Forest Area. The water quality were analysed for major cations (Ca, Mg, Na), dissolved metals, suspended solid and in-situ physico-chemical parameters: temperature, pressure, conductivity, dissolved oxygen (DO), turbidity, and pH in the rivers of Kawag Forest Area. Major cations and dissolved metals were analysed using ICP-OES while the in-situ parameters were tested using YSI multi parameters. The results show the concentrations trend of major cations in the order of Ca>Na>Mg>K. The rivers are classified between Class I and Class IIA based on the National Water Quality Standards for Malaysia (NWQSM). Despite of the forest background that it had been repeatedly logged, the water quality in Kawag Forest Area is unexpectedly in pristine condition, and much better than most of the undisturbed tropica...

Research paper thumbnail of The effect of canopy density and nearest canopy heighton through fall within a small catchment

A study was conducted within Bam River catchment in Danum Valley, Lahad Datu. The purpose of this... more A study was conducted within Bam River catchment in Danum Valley, Lahad Datu. The purpose of this study is to estimate throughfall and interception value in Baru River catchment area. This research also studied the effect of nearest canopy height and canopy density of two individual tree species (Shorea parvifolia and Koompasia excelsa). Throughfall measurement was carried out from 14 August to 14 December 2008 using 40 Personal designed storage gauges. Throughfall was quantified as 66.5% from the gross rainfall during three months study. The estimated interception loss was 32.1 % at the gross rainfall which is higher than the previous study. The high interception loss due to low throughfall may have resulted from the spatial variability of rainfall in Baru catchment and Danum Valley Field centre (DVFC). The weak relationship between canopy density and interception loss indicates tendency of canopy density to influence the interception loss but canopy architecture, on the other hand...

Research paper thumbnail of Hydrology of Acidic Mine Pit Lake: A Case Study of ex-Copper mine Pit Lake, Mamut, Sabah Malaysia

IOP conference series, Nov 1, 2022

Hydrological study of pit lake was carried out in ex-Mamut Copper Mine (MCM), Ranau Sabah. Gaugin... more Hydrological study of pit lake was carried out in ex-Mamut Copper Mine (MCM), Ranau Sabah. Gauging stations were established to measure surface inflows and outflows of the pit lake. Each station was equipped with a continuous water level recorder to record water level data at 10 ̶ minutes intervals. Rainfall and evaporation were measured respectively using storage gauge and evaporation pan. Over the entire study period, surface inflow accounted for 32.11% of the water entering the lake, the rest being provided by direct precipitation on the lake surface. Surface outflow discharges 53.13% of the water from the lake. Evaporation from the lake contributed 30.10% of water loss to the atmosphere. Changes of storage ranged from 61.09 mm to 241.56 mm per month. Simple linear regression analysis showed that, changes in lake level can be explained through rainfall and resulting tributary inflows, rate of surface outflow and evaporation, which would allow projections of possible future levels to be made by analysis of these components.

Research paper thumbnail of Mass Balance and Dissolved Metal Loads in the Mamut Copper Mine Temporary Settling Pond

IOP Conference Series: Earth and Environmental Science

Mining activities which involve certain sulphide bearing minerals generally produce acid mine dra... more Mining activities which involve certain sulphide bearing minerals generally produce acid mine drainage. The understanding of the characteristics of dissolved metals before they are discharged into streams is important for environmental management. This study focuses on a small water reservoir in the former Mamut Copper Mine, known locally as the Temporary Settling Pond (TSP). The main objective of this study is to estimate the mass balance and load of dissolved metals in the acid mine drainage (from the mine pit to the TSP). Water sampling and discharge measurements were done during baseflow and high flows using water level sensors and dataloggers. The analysis of dissolved elements in water samples was done using ICP-OES, while sulphate was analysed using a ‘HACH’ spectrometer kit. Through the mass balance method, Fe had the highest removal rate followed by Cu, Al, Zn and Mn. The highest dissolved metal load discharged from the TSP was Al followed by Mn, Cu, Zn and Fe.

Research paper thumbnail of Distance impacts toxic metals pollution in mining affected river sediments

Research paper thumbnail of Water quality status of Liwagu River, Tambunan, Sabah, Malaysia

A study on water quality at selected sites along the two main tributaries of Liwagu River was car... more A study on water quality at selected sites along the two main tributaries of Liwagu River was carried out. Eight water samples were collected along the river for physical and chemical analysis. The physical and chemical water quality analyses were carried out according to APHA procedures. The result of water quality analysis (physico- chemical) indicated that both of the tributaries are characterised by excellent water quality with an average of 94.5 value of WQI. This river was classified into Class I - Class II based on National Water Quality Standards for Malaysia (NWQSM) and the Water Quality Index (WQI).

Research paper thumbnail of A Pristine Water Quality of Repeatedly Logged Forest River in Kawag Forest Area, Ulu Segama Malua Forest Reserve, Sabah

Transactions on Science and Technology, 2019

Water chemistry of Kawag Forest Area was studied based on the major ion chemistry and in-situ wat... more Water chemistry of Kawag Forest Area was studied based on the major ion chemistry and in-situ water quality parameters. The sampling stations were selected in two streams of Kawag Forest Area. The water quality were analysed for major cations (Ca, Mg, Na), dissolved metals, suspended solid and in-situ physico-chemical parameters: temperature, pressure, conductivity, dissolved oxygen (DO), turbidity, and pH in the rivers of Kawag Forest Area. Major cations and dissolved metals were analysed using ICP-OES while the in-situ parameters were tested using YSI multi parameters. The results show the concentrations trend of major cations in the order of Ca>Na>Mg>K. The rivers are classified between Class I and Class IIA based on the National Water Quality Standards for Malaysia (NWQSM). Despite of the forest background that it had been repeatedly logged, the water quality in Kawag Forest Area is unexpectedly in pristine condition, and much better than most of the undisturbed tropica...

Research paper thumbnail of The effect of canopy density and nearest canopy heighton through fall within a small catchment

A study was conducted within Bam River catchment in Danum Valley, Lahad Datu. The purpose of this... more A study was conducted within Bam River catchment in Danum Valley, Lahad Datu. The purpose of this study is to estimate throughfall and interception value in Baru River catchment area. This research also studied the effect of nearest canopy height and canopy density of two individual tree species (Shorea parvifolia and Koompasia excelsa). Throughfall measurement was carried out from 14 August to 14 December 2008 using 40 Personal designed storage gauges. Throughfall was quantified as 66.5% from the gross rainfall during three months study. The estimated interception loss was 32.1 % at the gross rainfall which is higher than the previous study. The high interception loss due to low throughfall may have resulted from the spatial variability of rainfall in Baru catchment and Danum Valley Field centre (DVFC). The weak relationship between canopy density and interception loss indicates tendency of canopy density to influence the interception loss but canopy architecture, on the other hand...