2.2.2. Ultimate analysis
The percentages of carbon, hydrogen, nitrogen, sulfur and oxygen
(by difference) of the EFB sample were determined after complete
combustion of the sample using a CHNS/O Analyzer (model
LECO TruSpec CHN, USA) following the ASTM D-5291 method.
Approximately 5.0 mg of grained EFB samples were placed in a
tin capsule and the capsule was crimped. This capsule, together
with capsules serving as a blank and capsules containing a standard
(sulfamethazine) were placed into the autosampler of the
CHNS/O analyzer. The analyzer oxidation temperature was set at
1000 C. Helium, oxygen and nitrogen were used as carrier combustion,
autosampler injection gases, respectively.