Determination of trace amounts of total arsenic in environmental samples by hydride generation flow injection-AAS using a mixed acid as a pretreatment agent.
A method is described for the determination of total arsenic by hydride generation-atomic absorption spectrophotometry using a mixed acid as a pretreatment. Hydride generation is done by the flow-injection method. The authors investigated in detail the temperature and time of decomposition using inorganic, organic arsenic and environmental standard samples, pretreated with nitric-perchloric-sulfuric mixed acid. By using a mixed acid as a pretreatment agent at 220 degrees C, the decomposition time could be shortened and the blank value of arsenic from the reagents used was reduced. The mixed acid of nitric-perchloric-sulfuric was also found to be effective as a pretreatment agent for organic arsenic compounds in which a dimethylated compound, sodium cacodylate or biological samples, is known to be one of the indecomposables. The present approach was proved to be satisfactory as a pretreatment for the quantitative analysis of trace amounts of total arsenic in liquid or solid environmental samples, such as geothermal water, sediments and biological samples.
Sakamoto
H
H
Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University, Korimoto, Kagoshima 890-0065, Japan.
Susa
Y
Y
Ishiyama
H
H
Tomiyasu
T
T
Anazawa
K
K
D000143:Acids; D001151:Arsenic / Q000032:analysis*; D001152:Arsenicals / Q000032:analysis*; D002138:Calibration; D004785:Environmental Pollutants / Q000032:analysis*; D017022:Flow Injection Analysis; D007202:Indicators and Reagents; D015203:Reproducibility of Results; D012996:Solutions; D013054:Spectrophotometry, Atomic
D000143:Acids; D001152:Arsenicals; D004785:Environmental Pollutants; D007202:Indicators and Reagents; D012996:Solutions; D001151:Arsenic