Chemistry, Environmental Chemistry, Water Science and Technology, Pollution
12
Scopus Publications
272
Scholar Citations
8
Scholar h-index
7
Scholar i10-index
Scopus Publications
Spatial interpretation, radiological mapping of background gamma radiation and risk evaluation for Southern regions of Tamil Nadu, India Velayutham Raja, Mallanpillai A. Neelakantan Environmental Forensics, 2024 The outdoor gamma dose rate was measured in 540 locations in southern regions (Ramanathapuram, Virudhunagar, Tirunelveli, and Thoothukudi) of Tamil Nadu, India. The measured dose rates vary from 35 to 335 nSv/h (mean 89 nSv/h). The observed mean dose rate (89 nSv/h) is 2.3 times higher than the national (India) average of 39 nSv/h (56 nGy/h) and 2.1 times higher than the world average of 41 nSv/h (59 nGy/h). Annual Effective Dose (AED) calculated varies from 0.04 to 0.41 mSv/y (mean 0.11 mSv/y). The mean AED (0.11 mSv/y) is 1.6 times higher than the world average annual effective dose of 0.07 mSv/y. 30% of the locations have higher AED values due to the higher radiation in that locations. The present study reveals that the Tirunelveli district of the southern Tamilnadu region has higher gamma radiation than the other four districts of this region and is due to the topography of coastal and mountainous areas in Tirunelveli. The higher gamma radiation dose in the study area is due to the radionuclides present in the mountainous region's rocks and the coastal regions' soils. The radiological maps were used for spatial interpretation of the outdoor gamma dose rate in the study area. The radiological cancer risk assessment reveals that the Tirunelveli district has a higher risk due to the higher background gamma radiation.
Toxic uranium contamination in groundwater of Thoothukudi district, India: Evaluation of health risks using the geochemical and statistical approach Velayutham Raja, Mallanpillai Ananthakrishnan Neelakantan Toxin Reviews, 2023 The present investigation aims to determine the health risks of toxic uranium contamination in the drinking water of the Thoothukudi district. Two hundred and eighty-six samples were examined during the pre- and post-monsoon seasons and found the uranium concentration ranges from <0.2 to 167 ppb (mean 12, Standard deviation 21) (pre-monsoon) and <02 to 190 ppb (mean 13, Standard deviation 24) (post-monsoon). Geochemical modeling studies and the reducing nature of samples reveal that the uraninite mineral is under saturated conditions, and the least soluble U4O9 mineral species is predominantly distributed during both seasons. Statistical analysis provides that applying nitrogen and phosphate fertilizers may induce the dissolution of uranium minerals, which is responsible for elevated uranium in the collected samples. The calculated noncarcinogenic risk of uranium range from 0.005 to 8.09 (pre-monsoon) and 0.005 to 9.18 (post-monsoon). 15% (pre-monsoon) and 17% (post-monsoon) of the samples show a higher noncarcinogenic risk. The calculated cancer mortality and morbidity are within the permissible limit of 10−3, and the present health risk assessment of uranium is evident that the people from this district have the chemical toxicity of uranium than the carcinogenic risk due to drinking water.
Pollution and noncarcinogenic health risk levels of nitrate and fluoride in groundwater of Ramanathapuram district, Tamil Nadu, India Velayutham Raja, Mallanpillai Anthakrishnan Neelakantan International Journal of Environmental Analytical Chemistry, 2023 Pollution level and noncarcinogenic health risks due to fluoride and nitrate in the groundwater samples from Ramanathapuram district during pre-monsoon (September 2016) were calculated. One hundred and fifty-two groundwater samples collected were analysed for various physicochemical parameters such as major cations (Ca2+, Mg2+, Na+, K+) and major anions (CO3 2-, HCO3 −, SO4 2-, Cl−, NO3 −, PO4 3-). The fluoride ion concentrations in the collected samples were measured using the fluoride ion-selective electrode. Noncarcinogenic risks were calculated based on fluoride and nitrate concentrations (fluoride – 0.02–1.00 and nitrate – 0.0–4.9). The calculated risk values exceed the United States Environmental Production Agency (USEPA) recommended value of 1. The habitants from the study area are under the health risk due to fluoride and nitrate. Water quality index (WQI) values of the analysed samples indicate that 52% poor, 14% very poor, and 4% unsuitable for drinking purposes. Piper plot shows that 58% of mixed Ca2+-Mg2+-Cl− and 16% of Na+-Cl− groundwater types are predominant in the study area. Gibbs plot reveals that 91% of the samples have rock-water interaction, and it is a principal process that controls the dissolution of minerals from the subsurface into groundwater. Statistical analysis (correlation analysis, factor analysis) reveals that the natural process (rock-water interaction, leaching of sediments) and anthropogenic activities (domestic sewage, untreated effluents from industries) are the reason for the high fluoride and nitrate concentration in the groundwater. High noncarcinogenic health risk places were marked in spatial distribution maps.
Application of GIS technique to address the uranium contamination in groundwater of a hard rock aquifer, South India Velayutham Raja, Mallanpillai Ananthakrishnan Neelakantan Geocarto International, 2022 The present research aims to determine the sources and concentration of uranium in the groundwater of the hard rock aquifer. Two hundred and fifty-four groundwater samples were collected, and the analysis shows the uranium concentrations range from 0.5 to 113 ppb (pre-monsoon) and 0.5 to 120 ppb (post-monsoon). Factor analysis illustrates that the lower concentrations of uranium in the study region may be due to the poor dissolution of minerals in the subsurface. Saturation Index values confirm that the Uraninite mineral is undersaturated, and the U4O9 has dominant distribution during both seasons. During both seasons, four samples have a uranium concentration of more than 60 ppb, which might be due to the fertilizer usage in the agricultural activities in the study area. The GIS technique highlights the uranium-contaminated location and polluted water quality parameters using the Inverse Distance Weighted spatial interpolation plots.
Evaluation of Groundwater Quality in Virudhunagar Taluk, Tamil Nadu, India by using Statistical Methods and GIS Technique R. Venkada Lakshmi, V. Raja, C. Puthiya Sekar, M. A. Neelakantan Journal of the Geological Society of India, 2021 Abstract In the present study, twenty water samples were collected during pre-monsoon (June 2017) and post-monsoon (December 2017) seasons. The water samples were analyzed to determine various chemical parameters like chloride, fluoride, sulphate, nitrate, phosphate. During pre-monsoon (PRM) and post-monsoon (POM) the order of dominance of anion in the water samples are HCO3-&gt; TDS &gt; Cl-&gt; SO42-&gt; TH &gt; NO3-&gt; F-&gt; PO4- and TDS &gt;HCO3-&gt;SO42-&gt;Cl-&gt; TH &gt;NO3-&gt;F-&gt;PO4-, respectively. The order of dominance of cations are Na+&gt; Ca2+&gt; Mg2+&gt; K+ in both the seasons. The irrigation water quality was determined using the parameters such as sodium absorption ratio (SAR), Kelly’s ratio (KR), residual sodium carbonate (RSC), potential salinity (PS), permeability index (PI), sodium percentage (SP), magnesium hazard, calcium to magnesium molar ratio. The groundwater’s geochemical control and hydrogeochemistry were evaluated using the Piper, Chadha, scatter and Gibbs plots. This study reveals that groundwater quality is unfit for drinking purposes at a few places in the study area.
Spatial interpretation, radiological mapping of background gamma radiation and risk evaluation for Southern regions of Tamil Nadu, India V Raja, MA Neelakantan Environmental Forensics 25 (1-2), 59-67 , 2024 2024 Citations: 8
Studies on hydrogeochemistry of uranium in groundwater of Tirunelveli district, Tamil Nadu, India V Raja, MA Neelakantan Journal of Earth System Science 132 (3), 146 , 2023 2023 Citations: 1
Pollution and noncarcinogenic health risk levels of nitrate and fluoride in groundwater of Ramanathapuram district, Tamil Nadu, India V Raja, MA Neelakantan International journal of environmental analytical chemistry 103 (10), 2254-2269 , 2023 2023 Citations: 16
Toxic uranium contamination in groundwater of Thoothukudi district, India: Evaluation of health risks using the geochemical and statistical approach V Raja, MA Neelakantan Toxin Reviews 42 (1), 316-331 , 2023 2023 Citations: 4
Application of GIS technique to address the uranium contamination in groundwater of a hard rock aquifer, South India V Raja, MA Neelakantan Geocarto International 37 (27), 18716-18730 , 2022 2022 Citations: 1
Industrial impact on groundwater quality with special reference to Cr 2+ and Pb 2+ in coastal aquifers RV Lakshmi, V Raja, S Chidambaram, CP Sekar, MA Neelakantan Environmental monitoring and assessment 193 (7), 389 , 2021 2021 Citations: 13
High background radiation places and spatial distribution of uranium in groundwater of monazite placer deposit in Kanniyakumari district, Tamil Nadu, India V Raja, SK Sahoo, K Sreekumar, MA Neelakantan Journal of radioanalytical and nuclear chemistry 328 (3), 925-939 , 2021 2021 Citations: 24
Evaluation of groundwater quality in Virudhunagar Taluk, Tamil Nadu, India by using statistical methods and GIS technique RV Lakshmi, V Raja, CP Sekar, MA Neelakantan Journal of the Geological Society of India 97 (5), 527-538 , 2021 2021 Citations: 13
Evaluation of groundwater quality with health risk assessment of fluoride and nitrate in Virudhunagar district, Tamil Nadu, India. Arab J Geosci 14 (1) V Raja, MA Neelakantan 2021 Citations: 5
Evaluation of groundwater quality with health risk assessment of fluoride and nitrate in Virudhunagar district, Tamil Nadu, India V Raja, MA Neelakantan Arabian journal of geosciences 14 (1), 52 , 2021 2021 Citations: 40
Health risk assessment of heavy metals in groundwater of industrial township Virudhunagar, Tamil Nadu, India V Raja, RV Lakshmi, CP Sekar, S Chidambaram, MA Neelakantan Archives of environmental contamination and toxicology 80 (1), 144-163 , 2021 2021 Citations: 120
Uranium quantification in groundwater and health risk from its ingestion in and around Tiruvannamalai, Tamil Nadu, India D Ganesh, GS Kumar, LA Najam, V Raja, MA Neelakantan, R Ravisankar Radiation protection dosimetry 189 (2), 137-148 , 2020 2020 Citations: 23
Study of Uranium Concentration in Drinking Water in Tiruvannamalai District, Tamil Nadu, India and Assessment of Health Risk JC Durai Ganesh, N. Harikrishnan, R. Ravisankar, A. Chandrasekaran, M.A ... Journal of Radiation and Nuclear Applications An International Journal 3 (2 … , 2018 2018 Citations: 4
Spatial distribution of uranium and associated water quality parameters in Ramanathapuram district of Tamilnadu SS Mariappan, V Raja, MA Neelakantan, SK Sahoo, K Sreekumar Proceedings of the twentieth national symposium on environment-challenges in … , 2018 2018
Spatial distribution of uranium and associated water quality parameters in Virudhunagar district of Tamilnadu V Raja, SS Mariappan, MA Neelakantan, SK Sahoo, K Sreekumar Proceedings of the twentieth national symposium on environment-challenges in … , 2018 2018
Measurement of natural uranium concentration in ground water samples around the Mountain Arunachala in Tiruvannamalai, Tamil Nadu D Ganesh, N Harikrishnan, R Ravisankar, A Chandrasekaran, ... Proceedings of the twentieth national symposium on environment-challenges in … , 2018 2018
MOST CITED SCHOLAR PUBLICATIONS
Health risk assessment of heavy metals in groundwater of industrial township Virudhunagar, Tamil Nadu, India V Raja, RV Lakshmi, CP Sekar, S Chidambaram, MA Neelakantan Archives of environmental contamination and toxicology 80 (1), 144-163 , 2021 2021 Citations: 120
Evaluation of groundwater quality with health risk assessment of fluoride and nitrate in Virudhunagar district, Tamil Nadu, India V Raja, MA Neelakantan Arabian journal of geosciences 14 (1), 52 , 2021 2021 Citations: 40
High background radiation places and spatial distribution of uranium in groundwater of monazite placer deposit in Kanniyakumari district, Tamil Nadu, India V Raja, SK Sahoo, K Sreekumar, MA Neelakantan Journal of radioanalytical and nuclear chemistry 328 (3), 925-939 , 2021 2021 Citations: 24
Uranium quantification in groundwater and health risk from its ingestion in and around Tiruvannamalai, Tamil Nadu, India D Ganesh, GS Kumar, LA Najam, V Raja, MA Neelakantan, R Ravisankar Radiation protection dosimetry 189 (2), 137-148 , 2020 2020 Citations: 23
Pollution and noncarcinogenic health risk levels of nitrate and fluoride in groundwater of Ramanathapuram district, Tamil Nadu, India V Raja, MA Neelakantan International journal of environmental analytical chemistry 103 (10), 2254-2269 , 2023 2023 Citations: 16
Industrial impact on groundwater quality with special reference to Cr 2+ and Pb 2+ in coastal aquifers RV Lakshmi, V Raja, S Chidambaram, CP Sekar, MA Neelakantan Environmental monitoring and assessment 193 (7), 389 , 2021 2021 Citations: 13
Evaluation of groundwater quality in Virudhunagar Taluk, Tamil Nadu, India by using statistical methods and GIS technique RV Lakshmi, V Raja, CP Sekar, MA Neelakantan Journal of the Geological Society of India 97 (5), 527-538 , 2021 2021 Citations: 13
Spatial interpretation, radiological mapping of background gamma radiation and risk evaluation for Southern regions of Tamil Nadu, India V Raja, MA Neelakantan Environmental Forensics 25 (1-2), 59-67 , 2024 2024 Citations: 8
Evaluation of groundwater quality with health risk assessment of fluoride and nitrate in Virudhunagar district, Tamil Nadu, India. Arab J Geosci 14 (1) V Raja, MA Neelakantan 2021 Citations: 5
Toxic uranium contamination in groundwater of Thoothukudi district, India: Evaluation of health risks using the geochemical and statistical approach V Raja, MA Neelakantan Toxin Reviews 42 (1), 316-331 , 2023 2023 Citations: 4
Study of Uranium Concentration in Drinking Water in Tiruvannamalai District, Tamil Nadu, India and Assessment of Health Risk JC Durai Ganesh, N. Harikrishnan, R. Ravisankar, A. Chandrasekaran, M.A ... Journal of Radiation and Nuclear Applications An International Journal 3 (2 … , 2018 2018 Citations: 4
Studies on hydrogeochemistry of uranium in groundwater of Tirunelveli district, Tamil Nadu, India V Raja, MA Neelakantan Journal of Earth System Science 132 (3), 146 , 2023 2023 Citations: 1
Application of GIS technique to address the uranium contamination in groundwater of a hard rock aquifer, South India V Raja, MA Neelakantan Geocarto International 37 (27), 18716-18730 , 2022 2022 Citations: 1
Spatial distribution of uranium and associated water quality parameters in Ramanathapuram district of Tamilnadu SS Mariappan, V Raja, MA Neelakantan, SK Sahoo, K Sreekumar Proceedings of the twentieth national symposium on environment-challenges in … , 2018 2018
Spatial distribution of uranium and associated water quality parameters in Virudhunagar district of Tamilnadu V Raja, SS Mariappan, MA Neelakantan, SK Sahoo, K Sreekumar Proceedings of the twentieth national symposium on environment-challenges in … , 2018 2018
Measurement of natural uranium concentration in ground water samples around the Mountain Arunachala in Tiruvannamalai, Tamil Nadu D Ganesh, N Harikrishnan, R Ravisankar, A Chandrasekaran, ... Proceedings of the twentieth national symposium on environment-challenges in … , 2018 2018
