• Jesitha K, Nimisha KM, Manjusha CM and Harikumar P S (2015) Biodegradation of endosulfan by Pseudomonas fluorescens. Environ. Process. 2, 225–240.Springer International Publishing Switzerland.
    • Megha P U, Murugan S and Hariikumar P S (2015) Identification of Bacterial Strains and GIS based Buffer Analysis of Canoly Canal, Kozhikode, India, Research Journal of Phrmaceutical, Biological and Chemical Sciences, Jan-Feb,,6(1),1475. Impact Factor 0.35
    • Megha P. U., Kavya P.,. Murugan S and. Harikumar P. S (2015), Sanitation Mapping of Groundwater Contamination in a Rural Village of India Journal of Environmental Protection, 2015, 6, 34-44 http://dx.doi.org/10.4236/jep.2015.61005 Impact Factor 0.85
    • Harikumar P S, Deepak R and Sabitha A R (2014). Water Quality Assessment of Valapattanam River Basin in Kerala, India, using Macro-Invertebrates as Biological Indicators, The Open Environmental & Biological Monitoring Journal, 2014, 6, 1-9
    • Harikumar P. S. Jesitha K, Megha T. and Kamalakshan Kokkal (2014). Persistence of endosulfan in selected areas of Kasaragod district, Kerala, Current Science, Vol. 106, 2014 Impact Factor 0.926
    • Manjusha C M, Megha P U and Harikumar P S (2014). Isolation and Characterisation of Total Streptocci and Faecal Streptococci from Kuppam river basin in South west coast of India, Int.J.Curr.Microbiol.App.Sci, 3(3): 164-175
    • Musthafa Odayooth Mavukkandy, Subhankar Karmakar & Harikumar PS, Assessment and rationalization of water quality monitoring network: a multivariatestatistical approach to the Kabbini River (India), Environ Sci Pollut Res, DOI 10.1007/s11356-014-3000-y, 2014, Springer-Verlag Berlin Heidelberg 2014 Impact Factor; 2.828
    • Harikumar P S and Madhava Chandran, Bacteriological Contamination of Groundwater due to Onsite Sanitation Problems in Kerala State: A case study, International Journal of Life Science Biotechnology and Plasma Research, Vol 2 No 3 July 2013
    • Harikumar P. S. and Manjusha C. M., Study on the antibacterial activity of selected natural herbs and their application in water treatment, Drink. Water Eng. Sci. 6, 199–231, 2013 doi:10.5194/dwesd-6-199-2013 Impact Factor 0.381
    • Harikumar P. S. Jesitha K and Sreechithra Remediation of Endosulfan by Biotic and Abiotic Methods, Journal of Environmental Protection (2013), 4, 418-425 http://dx.doi.org/10.4236/jep.2013.45050 Impact Factor 0.85
    • Harikumar PS, Litty Joseph and Dhanya A, Photocatalytic degradation of textile dyes by hydrogel supported titanium dioxide nanoparticles Journal of Environmental Engineering & Ecological Science Vol 2 , 2013
    • Jesitha K., Sreechithra M., Harikumar P.S, Endosulfan remediation using aquatic and terrestrial plant species, Acta Biologica Indica 2013, 2(2):388-393
    • Megha T, Harikumar P S (2013). Immobilization and mobilization effect of ammonium molybdate on phytoremediation of toxic heavy metals in soil, Research Article, Acta Biologica Indica 2013, 2(1):353-360
    • Harikumar P S , Jaseela C and Megha T, Defluoridation of Water Using Biosorbents, Natural Science, Vol (4), No 4, 2012, 245-251. Impact Factor 0.96 (Google based)
    • Harikumar P S and Litty Joseph, Kinetic and Thermodynamics Studies of As (III) Adsorption Onto Iron Nanoparticles Entrapped Ca-alginate Beads (2012), International Journal of Plant, Animal and Environmental Sciences, Volume-2, Issue-1, Impact Factor 0.297
    • Harikumar P S, Jaseela C and Megha T, Defluoridation of Water Using Biosorbents , Natural Science Vol.4, No.4, 245-251 (2012) http://dx.doi.org/10.4236/ns.2012.44035 2-year Google-based Journal Impact Factor (2-GJIF) 0.96
    • Harikumar. P.S, Bindhya Mol.K, A synoptic study on the preparation of a liquid waste management plan for Kerala state, India, Environment and Natural Resources Research. Vol.2.No.2, (2012) Impact Factor 0.059
    • Bhaskar Rao B, Harikumar PS, Jayakrishnan T, George B, Characteristics of Aedes (Stegomyia) albopictus Skuse (Diptera : Culicidae) breeding sites, The Southeast Asian Journal of Tropical Medicine and Public Health Volume 42 5 , 2011 , 1077-1082 Impact Factor 0.546
    • Harikumar P.S and Nasir U.P, Hydrochemical and isotopic investigation of a tropical wetland system in the Indian subcontinent, Environmental Earth Sciences, 2011 10.1007/s12665-011-1211-9 Impact Factor 1.765
    • Maheesan P.M, G Srinikethan and Harikumar, P.S, Performance evaluation of integrated treatment plant of trickling filter and constructed wetland, International Journal of Engineering Science and Technology (IJEST) Vol. 3 No. 1 Jan 2011
    • Nasir U. P and Harikumar P. S, Ecotoxicity and Ecosystem Health of Ramsar Wetland System of India, Journal of Environmental Protection, 2011, 2, 710-719 Impact Factor 0.85
    • Harikumar P S and Jisha T S Distribution pattern of trace metal pollutants in the sediments of an urban wetland in the southwest coast of India, International Journal of Engineering Science and Technology, vol 2 (5),2010, 840-850.Impact Factor 0.8470
    • Harikumar P S, Prajitha K and Shilpa S , Assessment of Heavy Metal Contamination in the Sediment s of a River Draining into a Ramsar Site in the Indian Sub Continent, Journal of Advanced Laboratory Research in Biology, vol1(1) July 2010
    • Harikumar P S, Treatment of Wastewater Using Artificial Wetlands: Magazine on Everything about Water, October 2010 (municipal water sector)
    • Harikumar P.S and Nasir U.P, Ecotoxicological impact assessment of heavy metals in core sediments of a tropical estuary, Ecotoxicology and Environmental Safety 73 (2010) 1742–1747. Elsevier Publication Impact Factor 2.572
    • Harikumar P.S, Moly A and Sabna V Water and Sediment Quality Assessment of Malampuzha, a Multipurpose Reservoir in India, Journal of Environmental Science and Engineering vol 4(2), 2010
    • Madhavn K and Harikumar P S Assessment of Water Quality Characteristics of Soda Water, Pollution Research, 2010 Issue no 2
    • Harikumar P S , Nasir U P and Mujeebu Rahman M P, Distribution of heavy metals in the core sediments of a tropical wetland system, International J. Environ. Sci. Tech., Vol 6(2), 2009, pp225-232 1.79
    • Jacks, G., P. S. Harikumar, and P. Bhattacharya. "Fluoride Mobilization in India." Goldschmidt Conf. Abstr. 2009.
    • Sreenikethan, G., Maheesan, P.M and Harikumar, P.S (2009), Tertiary treatment in a vertical flow reed bed system, Journal of Industrial Pollution Control, 25 (1), pp. 79-81.
    • Sreejith K.P. , Rajeesh Kumar M.P., Kamalakshan Kokkal and Harikumar P.S.(2008) Comparison of water quality status of east and west flowing river basins of Kerala employing plankton and benthic analysis, Indian Journal of Environment and Eco planning, 15(3),463-470
    • Harikumar P S, Madhavan K, Shimjida P and Bindu K R, Study on Hydrochemistry and Quality of Vembanad Lake in the Southwest (Kerala) Coast of India, Eco-Chronicle, Vol 2(2), June 2007, 69-80
    • Sreenikethan G, Harikumar P S and Maheesan P M (2007), Process of Nitrification in Constructed Wetland Having Vertical Flow Beds, Eco-Chronicle,Vol 2(4)
    • Harikumar, P. S (2006) "Environmental Status of Kol Wetland System of Thrissur District with Special Reference to Water and Sediment Quality."Ecology Environment and Conservation 12.2, 262.
    • Harikumar, P. S., and K. Madhavan. "Estimation of Water Pollution and Assimilative Capacity of River Pamba, Kerala." POLLUTION RESEARCH 25.4 (2006): 707.
    • Harikumar P S(2005) Indigenous Technologies for Drinking Water Treatment, Folkore Research Journal, 15, June
    • Remani, K. N, Harikumar P. S, and Shiny K. J (2004) Ecological status of Chitrapuzha river with reference to discharge of Industrial effluents in Cochin Area., Ecology Environment and Conservation 10 183-186.
    • Harikumar, P. S., Madhavan, K., & Khan, A. B. (2000). Water quality problems of Kerala with special reference to fluoride. Ecology Environment and Conservation, 6, 245-249.
    • Lakshmi, K, Narayanan Unni P N and Harikumar P S (2000) "Environmental Status of the Mangrove Ecosystem in Valapattanam River Basin, Kerala." Ecology, Environment & Conservation 6.4 : 363-371