00276nam a2200097 4500 4695 4695 Silva,Pathum Dilshan de Wathudura Microwave and open vessel digestion methods for biochar and activated carbon Rajagiriya Ichemc 2018 30 BK 0 0 0 IC IC GEN 2018-11-10 0 D0332 2018-11-10 00:00:00 2018-11-10 DIS