Prof. M. Dayal P. De Costa
Department of Chemistry
Conference papers
“Performance evaluation of market available oxidative hair dye: An improvement to SLS method”
“Performance evaluation of market available oxidative hair dye: An improvement to SLS method”, M.D.P. De Costa, K.D.P. Hemalal and K.S. Kalhari, Chemistry in Sri Lanka, 27(2), 15-16, 2010.
“A modified method for the determination of total fatty matter in soap”
“A modified method for the determination of total fatty matter in soap”, M.D.P. De Costa, K.D.P. Hemalal. K.R.R.N Warnasekera, K.S. Kalhari, R. Rajapaksha, D.M.U.J. Abeysinghe, A.M.D. Attanayake, Chemistry in Sri Lanka, 27(2), 15, 2010.
“Speciation studies on Cu(II) and Fe(III) complexes of 1-napthalenemethyliminodiacetohydroxamic acid”
“Speciation studies on Cu(II) and Fe(III) complexes of 1-napthalenemethyliminodiacetohydroxamic acid”, Senthilnithy R., Gunawardhana H. D. and Costa M. D. P. De, Chemistry in Sri Lanka, (2006), 23-2, 34.
“Potentiometric determination of ionization constant of N-arylhydroxamic acid in non-aqueous solvent; a comparative study with spectroscopic method”
“Potentiometric determination of ionization constant of N-arylhydroxamic acid in non-aqueous solvent; a comparative study with spectroscopic method”, R.Senthilnithy, H. D. Gunawardhana and M. D. P. De Costa, , Sri Lanka Association for Advancement of Science, Proceedings of 61st Annual Session (2005), Part I-Abstracts, 68-69.
“Determination of pKa value using Electronic Spectroscopy: A modification of available classical method”
“Determination of pKa value using Electronic Spectroscopy: A modification of available classical method”, Chemistry in Sri Lanka, R.Senthilnithy, H. D Gunawardhana. and M. D. P. De Costa, (2005), 22-2, 22
“Aminodihydroxamic acid derivative of naphthalene as a fluorescence ionophore for iron(III)”
“Aminodihydroxamic acid derivative of naphthalene as a fluorescence ionophore for iron(III)”, R.Senthilnithy, H. D. Gunawardhana and M. D. P. De Costa, Sri Lanka Association for Advancement of Science, Proceedings of 61st Annual Session 2005, Part I-Abstracts, 68.
“Substituent Effects on Isobestic Points of Charge Transfer Absorption of Metal Ion-Monohydroxamate in Methanol”
“Substituent Effects on Isobestic Points of Charge Transfer Absorption of Metal Ion-Monohydroxamate in Methanol”, R. Senthilnithy, M. D. P. De Costa and H. D. Gunawardhana, Chemistry in Sri Lanka, 21(2), 18 , 2004.
“Photoinduced electron transfer: Mechanistic studies and development of fluorescence probes for analysis of metal ions of metal ions in trace level”
“Photoinduced electron transfer: Mechanistic studies and development of fluorescence probes for analysis of metal ions of metal ions in trace level”, 21(3), 14-18, 2004.
“Determination of pKa value using electronic spectroscopy: A modification of available classical method
“Determination of pKa value using electronic spectroscopy: A modification of available classical method”, M. D. P. De Costa and H. D. Gunawardhana, Chemistry in Sri Lanka, 21(2), 18 , 2004.
“Determination of Cu (ii) using carbon-paste modified electrodes: an experiment to undergraduates”
“Determination of Cu (ii) using carbon-paste modified electrodes: an experiment to undergraduates” M.D.P. De Costa and R. Senthilnithy, Conference on Chemical Education for National Development, April 29 – 30, 2004.
“Bihydroxamic acid derivative of Naphthalene as a Fluorescence Ionophore for Mn (II)”
“Bihydroxamic acid derivative of Naphthalene as a Fluorescence Ionophore for Mn (II)”, M.D.P De Costa and W.A.P.A. Jayasinghe, Chemistry in Sri Lanka, 21(2), 17 , 2004.
“Naphthalene linked hydroxamic acid derivative for trace metal analysis”
“Naphthalene linked hydroxamic acid derivative for trace metal analysis”, M.D.P De Costa and P.A. Jayasinghe, Chemistry in Sri Lanka 20, 8, 2003
Intramolecular versus intermolecular photoinduced electron-transfer between anthracene and benzoate chromophore”
Intramolecular versus intermolecular photoinduced electron-transfer between anthracene and benzoate chromophore”, M.D.P. De Costa and K.T.D. Abeynayaka, Annual Sessions, Faculty of Science, University of Colombo, 1, 6, 2000
“Studies of the variation of fluorescence intensity on binding of metal ion with hydroximic acid linked anthracene chromophore”
“Studies of the variation of fluorescence intensity on binding of metal ion with hydroximic acid linked anthracene chromophore”, M.D.P. De Costa, A.S Amarasekera and S. Perera, Proc. Sri Lanka Association for the advancement of Science 56(1), 228, 2000.
“Solvent dependence of exciplex formation between pyrene and methyl 4-cynobenzoate”
“Solvent dependence of exciplex formation between pyrene and methyl 4-cynobenzoate”, M.D.P. De Costa and K.T.D. Abeynayaka, Proc. Sri Lanka Association for the advancement of Science 56(1), 227, 2000
“9-Fluorenyl carbocation: Is it aromatic or antiaromatic?”
“9-Fluorenyl carbocation: Is it aromatic or antiaromatic?”, M.D.P. De Costa and M. De S Boralessa, Proc. Sri Lanka Association for the advancement of Science 56(1), 229, 2000.
“Photoinduced intramolecular electron transfer of pyrenyl methyl esters: Medium effects”
“Photoinduced intramolecular electron transfer of pyrenyl methyl esters: Medium effects”, M.D.P. De Costa, Chemistry in Sri Lanka 16(1), 48-49, 1999.
“Photoinduced Intramolecular electron-transfer of 9-anthracene methylbenzoate in micellar solutions”
“Photoinduced Intramolecular electron-transfer of 9-anthracene methylbenzoate in micellar solutions”, M.D.P. De Costa R.C. Wickramage and K.A.D. Sriyani Mallika, Chemistry in Sri Lanka 14(1), 10-12, 1997
“Substituent Effect on the intramolecular electron transfer antharacene methyl benzoate ester in methanol”
“Substituent Effect on the intramolecular electron transfer antharacene methyl benzoate ester in methanol”, M.D.P. DeCosta, P.K Cumaranatunga and S.Kandiah, Proc. Sri Lanka Association for the advancement of Science 51(1), 428, 1995
“Photoinduced intramolecular of 9-anthracencemethyl esters in aqueous -cyclodextiene”
“Photoinduced intramolecular of 9-anthracencemethyl esters in aqueous -cyclodextiene”, M.D. P. De Costa and P.K. Cumaranatunga, Proc. Sri Lanka Association for the advancement of Science 51(1), 430, 1995.
“Intramolecular electron transfer of 1-cyano naphthylmethyl benzoate in aqueous -cyclodextrine”
“Intramolecular electron transfer of 1-cyano naphthylmethyl benzoate in aqueous -cyclodextrine”, Proc. Sri Lanka Association for the advancement of Science 50(1), 247 1994.
“Development of a low cost voltameter”, M.D.P. De Costa and T Vasanthakumar, Chemistry in Sri Lanka 10,244, 1994.
“A New Oxine Derivative for the determination of aluminum in trace level”
“A New Oxine Derivative for the determination of aluminum in trace level”, M.D.P. De Costa and M.K. Karunarathna, Proc. Sri Lanka Association for the advancement of Science 49(1), 216, 1993.
“The effect of the medium on the intramolecular electron-transfer of naphthylmethyl benzoate esters”,
“The effect of the medium on the intramolecular electron-transfer of naphthylmethyl benzoate esters”, M.D.P. De Costa and A.N. Ranasinghe, Proc. Sri Lanka Association for the advancement of Science 48(1), 115, 1992
“Photolysis of 9-fluorenyl phenylacetate: A novel photoremovable protecting group for carboxylic acids”
“Photolysis of 9-fluorenyl phenylacetate: A novel photoremovable protecting group for carboxylic acids”, M.D.P. De Costa and K.M.N. de Silva, Proc. Sri Lanka Association for the advancement of Science 48(1), 114, 1992
“Structural variation on the electronic spectra of an optical brightener”
“Structural variation on the electronic spectra of an optical brightener”, A.P. de Silva and M.D.P. De Costa, Proc. Sri Lanka Association for the advancement of Science 40(1), 85, 1984
“Simultaneous solvent and structure variation on the fluorescence of an optical brightener”
“Simultaneous solvent and structure variation on the fluorescence of an optical brightener”, M.D.P. De Costa, Proc. Sri Lanka Association for the advancement of Science 40(1), 85, 1984