University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Reference Material -> NIES -> 10 -> Rice flour

Citations 1

"Complex Formation Of 2-(5-nitro-2-pyridylazo)-5-(N-propyl-N-sulfo-propy Lamino)phenol With Lead, Cadmium And Manganese For Their Sensitive Spectrophotometric Detection In Flow Injection And Ion Chromatography Systems"
Anal. Chim. Acta 1997 Volume 345, Issue 1-3 Pages 139-146
Takeshi Yamane* and Yuzuru Yamaguchi

Abstract: An ion-chromatographic method with post-column derivatization and spectrophotometric detection was developed for the simultaneous determination of Pb, Cd and Mn. Analysis was carried out on a strongly acidic cation-exchange column (7 cm x 4 mm i.d.). Elution (1 ml/min) was with 0.15 M malic acid of pH 5. The injection volume was 588 µL. The column effluent was merged with a reagent stream containing 60 µM-2-(5-nitro-2-pyridylazo)-5-(N-propyl-N-su lfo-propylamino)phenol/0.2 M 2-(cyclohexylamino)ethanesulfonic acid/0.16 M NaOH of pH 9.4 at a flow rate of 1 ml/min. Detection was at 574 nm. Calibration graphs were linear up to 150 ng/ml Cd and Mn, and 300 ng/ml Pb; detection limits were 1.9, 1.5 and 4.8 ng/ml, respectively. RSD were 2.1%, 2.5% and 3.2% for 50 ng/ml Cd, Mn and Pb, respectively. The method was verified by analyzing rice flour CRM following microwave assisted digestion and river water samples spiked with Cd, Mn and Pb.
Lead Cadmium Magnesium HPIC Spectrophotometry Sample preparation Post-column derivatization Reference material Interferences