Separation and preconcentration of trace amounts of aluminum ions in surface water samples using different analytical techniques.
A separation/preconcentration of aluminum (III) (Al(3+)) has been developed to overcome the problem of high matrix species, which may interfere with the determination of trace quantity of Al(3+) in natural water samples. The separation of Al(3+) in water samples was carried out from interfering cations by complexing them with 2-methyle 8-hyroxyquinoline (quinaldine) on activated silica. Whereas the separated trace amounts of Al(3+) was preconcentrated by cloud point extraction (CPE), as prior step to its determination by spectrofluorimetry (SPF) and flame atomic absorption spectrometry (FAAS). The Al(3+) react with 8-hydroxyquinoline (oxine) and then entrapped in non-ionic surfactant Triton X-114. The main factors affecting CPE efficiency, such as pH of sample solution, concentration of oxine and Triton X-114, equilibration temperature and time period for shaking were investigated in detail. The validity of separation/preconcentration of Al(3+) was checked by certified reference material of water (SRM-1643e). After optimization of the complexation and extraction conditions, a preconcentration factor of 20 was obtained for Al(3+) in 10 mL of natural water samples. The relative standard deviation for 6 replicates containing 100 microg L(-1) of Al(3+) was 5.41 and 4.53% for SPF and FAAS, respectively. The proposed method has been applied for determination of trace amount of Al(3+) in natural water samples with satisfactory results.
Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. skhanzai@gmail.com
Sumaira
S
Khan
Tasneem G
TG
Kazi
Jameel A
JA
Baig
Nida F
NF
Kolachi
Hassan I
HI
Afridi
Abdul Q
AQ
Shah
Ghulam A
GA
Kandhro
Sham
S
Kumar
D000327:Adsorption; D000535:Aluminum / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D017830:Octoxynol; D015125:Oxyquinoline / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011798:Quinaldines / Q000737:chemistry; D015203:Reproducibility of Results; D052616:Solid Phase Extraction; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification
D011798:Quinaldines; D014874:Water Pollutants, Chemical; D011092:Polyethylene Glycols; D015125:Oxyquinoline; D017830:Octoxynol; C010615:Nonidet P-40; D000535:Aluminum; C037073:2-methylquinoline