1. Armesto, L., Bahillo, A., Veijonen, K., Cabanillas, A. and Otero, J.: 2002, ‘Combustion behaviour of rice husk in a bubbling fluidised bed’, Biomass Bioenerg. 23, 171–179.
2. ASTM: Annual book of ASTM Standards: 1996a, ‘Standard test method for moisture in activated carbon’, D2867-95, 15.01, 500.
3. ASTM: Annual book of ASTM Standards: 1996b, ‘Standard test methods for chromium in water’, D 1687-92, 11.01, 162–167.
4. ASTM: Annual book of ASTM Standards: 1996c, ‘Standard test method for total ash content of activated carbon’, D 2866-94, 15.01, 498.
5. ASTM: Annual book of ASTM Standards: 1996d, ‘Standard test methods for carbon black – pH value’, D1512-95, 9.01, 293–296.