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39
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Introduction
Current institution
Additional affiliations
July 2008 - present
October 2013 - September 2016
February 2008 - June 2008
Independent Researcher
Position
- Research Assistant
Education
October 2013 - October 2016
September 2006 - November 2007
May 2001 - May 2005
Publications
Publications (39)
The geochemistry of regional groundwater has been utilized worldwide to discover subsurface mineral deposits, though it has not yet been practiced in Sri Lanka. The present study focuses on utilizing geochemistry of groundwater in the Udawalawe area of south-central Sri Lanka where two serpentinite bodies exist within the high-grade crystalline bas...
Changes in mineralogical, chemical, and mechanical properties of a rock mass during the weathering process allow calibrating the degree of weathering. Based on those properties, various weathering indices can be used as tools for this purpose. This study focuses on using chemical weathering indices that represent the chemical behaviour of a rock ma...
Bottled water is one of the major drinking water sources for travellers in tourist hubs in Sri Lanka. In this study, 32 major bottled water brands sold in the country were analyzed with 19 parameters by means of atomic absorption spectrometer, spectrophotometer and titration. The main objective of the present study is to investigate geochemical var...
Groundwater in and around Mahaoya thermal springs found in the Precambrian high-grade metamorphic terrain of Sri Lanka were investigated to assess their geochemical properties with compared to normal regional groundwater of particular area and to produce a data set to develop a model of identification of thermal springs or mixing of thermal and non...
Coastal aquifers are highly vulnerable to seawater intrusion due to natural and anthropogenic factors such as over-extraction, sea-level rise, and geological conditions. The shallow coastal aquifer along Sri Lanka’s eastern coast faces salinization risks due to overexploitation. This study focused on a 50 km stretch from Kallady to Karaitivu, where...
This paper presents the challenges and scientific approach adopted to overcome those challenges for Rural WSP (RWSP) implementation for the water supply schemes (WSS) in the Sri Lankan Tea Plantation sector. Factors positively and negatively impacting WSP implementation were identified through a SWOT analysis. Pooled response of the Likert scale su...
Water Chemistry Laboratory Handbook - I" is a vital resource designed to simplify the complex field of water chemistry for undergraduate students. It serves as a bridge between theoretical concepts and practical applications, making it accessible and comprehensible.
This handbook offers a clear and concise explanation of the fundamental principle...
Beach placers are concentrations of economically potential minerals formed by surface earth processes and are identified
as one of the most easily exploitable mineral deposits in the world. We studied the placer and non-placer sediments in
lagoonal and riverine beaches of the southeastern part of Sri Lanka to unravel their specific sedimentary feat...
The beach placers are largely composed of resistant heavy minerals and are known as one of the most easily exploitable mineral deposits in the world. Such placers are commonly deposited along the edges of large water bodies due to the gravity separation processes. The southeastern coast of Sri Lanka contains extensive depositional beaches, lagoons,...
Chronic Kidney Disease with unknown etiology (CKDu) has impacted adversely the health sector as well as the socio-economic sector in Sri Lanka. During the past two decades, CKDu escalated to dry and intermediate zone in Uva Province at an alarming rate. Therefore, this study aimed to investigate the impact of physicochemical parameters including ne...
Southeastern landmass of Sri Lanka is laid on the Vijayan Complex (VC) rocks, a Precambrian basement characterized with specific geological features since the mineralized contact zone of the Highland–Vijayan boundary is nearby. However, the coastal sedimentation of such a basement is rarely interpreted. Hence, the mineralogy and geochemistry of sur...
Beach-rocks are cemented coastal sediments that occur mainly under subtropical to tropical climatic conditions. Due to higher biogenic chemical association on the beach fronts, Sri Lanka comprises variety of beach-rocks around the island. This study was aimed to report the field, mineralogical and geochemical characteristics of ilmenite rich beach-...
Reverse Osmosis (RO) membrane technology is one of the promising techniques used to provide safe drinking water to the community, particularly chronic kidney disease of unknown etiology (CKDu) affected areas in the dry zone of Sri Lanka. The rejected water from the RO plant is known as the RO concentrate, which is generally released to the environm...
Prawn industries are one of the fast-growing export oriented industries in Sri Lanka that spreads over the coastal belt in northwestern province of the country. However, wastewater originated from prawn-farms contain an excessive amount of nitrate that is becoming a crucial issue on human health and environment. Currently there are no proper practi...
Azolla pinnata is a free floating water fern that is widely spread in Eastern hemisphere. The phytoremediation ability of A. pinnatahas been done for several heavy metals as Pb, Cd, Cr and Ni, dyes, and various nutrient removals from surface water. In this study phytoremediation ability of A. pinnta was observed for Mn removal. A laboratory scale e...
This license permits use, distribution and reproduction, commercial and non-commercial, provided that the original work is properly cited and is not changed in anyway. This study examined the sedimentology and geochemistry of the alluvial gem-bearing succession in Pelmadulla, Sri Lanka. The major aims were to investigate study indicated different l...
The effect of weathering on changes of physical and mechanical properties of rocks is a prime concern in the perspectives of geology and engineering. These properties have been studied mostly on weathered igneous and sedimentary rocks under humid climates. Studies on weathering of metamorphic rocks, especially under a tropical climate, are rare. Th...
Water-rock interaction experiments, which have been carried out for specified purposes using different minerals and rocks under controlled conditions, were used to study the effect of dissolution of minerals on weathering of metamorphic rocks of different weathering grades. Samples of sillimanite-garnet gneiss were collected at the Samanalawewa hyd...
Geochemical survey was done for thermal water and cold water around non-volcanic geothermal fields in Sri Lanka. One hundred samples were analyzed for fifteen selected irons in order to investigate geochemical relationships due to water-rock interaction. Geochemistry of thermal waters are distinct from cold water. Higher contents of Na, K, Cl, F, S...
Having a better understanding of the weathering grade of rock materials is highly beneficial in the perspective of civil engineering and geology. The classification of weathering grades can be performed based on the chemical, physical, mineralogical, textural and strength properties of rocks. Among those, the use of chemical components to classify...
Rocks utilized for the Samanalawewa Project have undergone severe weathering after excavation. Rocks in the project area have undergone differential weathering and therefore, various weathering grades can be observed in the project area. The rocks used as construction materials, foundation materials and road aggregates suffer this calamity and they...
Questions
Questions (28)
Hi,
Does anyone has drawings of all crystals (pure forms not combinations) of seven crystal systems?
Thanks in advance
I have measured the electrical conductivity of a water-rock interacted solution continuously. Could I use that data to calculate the dissolution rate? is it reliable? Could you please suggest me a few references?
Thank you
Rocks metamorphosed deep in the earth later appear on the surface due to weathering-erosion and or upliftment. Is there any way to estimate the stored stress in the rock when they reached the earth surface? Or are such data available?
Thank you
I have tested point load strength of a gneissic rock and two loading directions were parallel and perpendicular to foliation plain. The rock included fresh to highly weathered samples. In each loading directions, the difference of point load strength between each weathering grade (eg Fresh to slightly, slightly to moderately, so on) is decreasing with increasing weathering grade.
I suppose it may be due to uniform weathering of the rock. Would there be any other explanation to this?
Thank you
I have analysed a water samples taken from a water-rock interaction experiments for its major anions and cations. These major ions were further analysed with Visual Minteq for saturation indices. Expect species of Fe, other species are under saturated. For Fe species, over saturated and some values are given.
The SI of ferryhydrite of one sample is 2,52 while another has as 2.66. What does different values mean? Positive values mean oversaturation and what is the threshold for precipitation according to these values?
I obtained a chemical composition of a plagioclase grain in weight percentage using SEM-EDS technique. The recalculated chemical formula of the grain is as follows using an MSExcel worksheet based programme.
Na0.5Ca0.2Al1.1Si2.3O8
Here the charge balance is problematic. What could I have possibly missed here?
Thanks in advance
Are there latest articles that discuss the relative mobility of major ions? For example, Angerson and Hawkes, 1958 put forward the relative mobility of cations during rock weathering as Ca> Na > Mg >K >Si> Al = Fe. (paper attached here).
I am sure that this has been challenged by many researches. Could you please suggest me a few articles which are related?
Thanks in advance
What are the reasons for having negative intensity (in cps) for elements like Al and Na in normal groundwater samples in ICP-AES analysis? The calibrations curves for both elements were fine.
Though the intensity is negative, it give a positive concentration values
Thanks in advance
One argued with me that solute transported by the capillary rise as advection. Can it really be? My counter argument was for media like clayey soils, the velocity of the capillary rise is much slower. So according to J=CV equation, in such media, dispersion should be dominant.
What do you think?
Thanks in advance
I have experienced (-) negative values for a particular element in AAS or ICE-AES analysis.
1. What does this really mean and how could it happen? Can we explain it using the calibration curve?
2. I further have observed that there is the same (-) value for a particular element in different samples and changing (-) value for a particular element in different samples. How can it be explained.
eg.
For Mn: Std are 0.3, 0.5 and 1 ppm in 0.1M HNO3
The samples in 0.1 HNO3 and calculated concentration is -0.035 for all (50) samples
For Ca: Std are 0.5, 1 and 1.5 ppm in 1M HNO3
The samples in 1M HNO3 and calculated concentrations are -0.157, -0.181, -0.199 (changing but (-)so on for all (30) samples.
Thanks in advance
I have SiO2 standard stock solution of 1000 ppm where SiO2 in 2M Na2CO3.
I want to prepare working standards of 0.3, 0.5. and 1 ppm solutions to be used in ICP-AES. The matrix of samples for ICPAES is usually HNO3. Should I dilute appropriate volumes of SiO2 with HNO3 or is there any other way?
(All other stock standards are either in 0.1 or 1 M HNO3, thus no complication)
Thanks in advance
