Reverse flow injection spectrophotometric for determination of aluminium(III).
A reverse flow injection analysis (rFIA) spectrophotometric method has been developed for the determination of aluminium(III). The method was based on the reaction of Al(III), quercetin and cetyltrimethylammonium bromide (CTAB), yielding a yellow colored complex in an acetate buffer medium (pH 5.5) with absorption maximum at 428 nm. The rFIA parameters that influence the FIA peak height have been optimized in order to obtain the best sensitivity and minimum reagent consumption. A linear relationship between the relative peak height and Al(III) concentrations were obtained over the concentration range of 0.02-0.50 mg L(-1) with a correlation coefficient of 0.9998. The limit of detection (LOD, defined as 3sigma) and limit of quantification (LOQ, defined as 10sigma) were 0.007 and 0.024 mg L(-1), respectively. The repeatability was 1.10% (n=11) for 0.2 mg L(-1) Al(III). The proposed method was applied to the determination of Al(III) in tap water samples with a sampling rate of 60 h(-1). Results obtained were in good agreement with those obtained by the official ICP-MS method at the 95% confidence level.
Norfun
Poachanee
P
Department of Chemistry, Center of Excellence for Innovation in Chemistry, Faculty of Science, and Institute for Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand.
Pojanakaroon
Teraboon
T
Liawraungrath
Saisunee
S
D000042:Absorption; D000535:Aluminum / Q000032:analysis*; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D017022:Flow Injection Analysis / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents / Q000737:chemistry; D011794:Quercetin / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D014867:Water / Q000737:chemistry
D002593:Cetrimonium Compounds; D007202:Indicators and Reagents; D014867:Water; D000431:Ethanol; D011794:Quercetin; D000535:Aluminum; D000077286:Cetrimonium