Institute of Chemistry Ceylon creator text Rajagiriya Institute of Chemistry Ceylon 2025 Vol.42 .No.1 monographic 42 The Tri Annual Publication of the Institute of Chemistry Ceylon chemistry 540 CHE https://ichemc.ac.lk/wp-content/uploads/2025/05/Vol.-42-No.-1-f.pdf https://ichemc.ac.lk/wp-content/uploads/2025/05/Vol.-42-No.-1-f.pdf