All samples were digested and analyzed at Center of excellence for
environmental and hazardous waste management, Chulalongkorn University by
microwave digestion machine and inductively coupled plasma optical emission
spectrometry, VISTA-MPX Axial (ICP-OES) respectively. Digestion method can
digest the target heavy metals in this the study including barium (Ba), cadmium (Cd),
chromium (Cr), manganese (Mn), nickel (Ni), and lead (Pb). Moreover, ICP can
analyze several metals per one time so include all of the six heavy metals (Cao et al,
2010) and (Wcislo et al, 2002). The concentrations of heavy metal were calculated in
milligram per liter (mg/L) and milligram per kilogram (mg/kg) or ppm and the
detection limit of each heavy metal was 0.005 mg/kg, except for lead that was 0.001
mg/kg.
All samples were digested and analyzed at Center of excellence forenvironmental and hazardous waste management, Chulalongkorn University bymicrowave digestion machine and inductively coupled plasma optical emissionspectrometry, VISTA-MPX Axial (ICP-OES) respectively. Digestion method candigest the target heavy metals in this the study including barium (Ba), cadmium (Cd),chromium (Cr), manganese (Mn), nickel (Ni), and lead (Pb). Moreover, ICP cananalyze several metals per one time so include all of the six heavy metals (Cao et al,2010) and (Wcislo et al, 2002). The concentrations of heavy metal were calculated inmilligram per liter (mg/L) and milligram per kilogram (mg/kg) or ppm and thedetection limit of each heavy metal was 0.005 mg/kg, except for lead that was 0.001mg/kg.
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