Sequential injection fluorimetric determination of Sn in juices of canned fruits.
The present work describes the development of a fast and robust sequential injection fluorimetric procedure for the determination of Sn in juices of canned fruits. The developed automatic methodology is based on the complexation of Sn with 8-hydroxyquinoline-5-sulfonic acid (HQSA) to form a fluorimetric product (lambda(exc)=354 nm; lambda(em)=510 nm). The influence of dimethylsulfoxide (DMSO) and cetylpyridinium bromide (CPB) on the sensitivity of the fluorimetric determination was evaluated. Linear calibration plots were obtained for Sn concentrations between 1 and 10 mg L(-1), with a detection limit of 0.38 mg L(-1). In each analytical cycle 0.006 mg of HQSA and 0.47 mg of CPB were consumed and 1.5 mL of effluent was generated. The developed methodology was applied to the determination of Sn in juices of canned fruits and the results complied with those furnished by an electrothermal atomic absorption spectrometry comparison procedure, with relative deviations lower than 5.2%. The automatic procedure exhibited good precision (R.S.D.<1.4%) and the sampling rate was about 70 determinations per hour.
Morte
Elane S Boa
ES
PRONEX - Instituto de Química, Universidade Federal da Bahia, Salvador, Bahia, Brazil.
Korn
Maria Graças A
MG
Saraiva
M Lúcia M F S
ML
Lima
José L F C
JL
Pinto
Paula C A G
PC
D002594:Cetylpyridinium / Q000737:chemistry; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D017022:Flow Injection Analysis / Q000379:methods*; D005470:Fluorometry / Q000379:methods*; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D005519:Food Preservation; D005638:Fruit / Q000737:chemistry*; D007202:Indicators and Reagents / Q000737:chemistry; D015125:Oxyquinoline / Q000031:analogs & derivatives / Q000737:chemistry; D013997:Time Factors; D014001:Tin / Q000032:analysis* / Q000737:chemistry
D007202:Indicators and Reagents; D015125:Oxyquinoline; D014001:Tin; C013053:8-hydroxyquinoline-5-sulfonic acid; D002594:Cetylpyridinium; D004121:Dimethyl Sulfoxide