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: Plant -> grapefruit -> leaves

Citations 1

"Flow Injection Flame Atomic Absorption Spectrometry For Slurry Atomization. Determination Of Calcium, Magnesium, Iron, Zinc And Manganese In Vegetables"
Anal. Chim. Acta 1993 Volume 283, Issue 1 Pages 393-400
P. Viñas, N. Campillo, I. López García and M. Hernández Córdoba*

Abstract: Washed cauliflower, bean, citrus and apple leaves were cut up, dried at 90°C, ground and calcined at 500°C for 1.5 h. The residue was ground and, for the determination of Fe, Mn and Zn with direct calibration, suspended in 10% glycerol solution containing 1% HCl, sonicated for 5 min and stirred for 10 min. The slurry was injected into a water carrier stream, which passed to the air-acetylene flame of the AAS instrument. The peak height of the transitory signal was measured. In the alternative standard addition method, the carrier was 10% glycerol/1% HCl containing added Mn(II), Fe(III) or Zn. For the determination of Ca and Mg, the ash was suspended in 1% HCl containing 1% La and 0.02% Triton X-100 and the slurry was injected into the online dilution device shown diagrammatically (Lopez Garcia et al., J. Anal. Atomic Spectrom., 1992, 7, 1291) with the same HCl-based solution as carrier. The determination limits were 12.4, 3.3 and 5.7 µg/g for Fe, Zn and Mn, respectively, and the corresponding RSD (n = 10) were 1.7, 0.9 and 0.8% at 57, 16 and 20 µg/g, respectively. In grapefruit leaves containing 0.4% Mg and 5.18% Ca, the RSD (n = 10) were 1.2 and 1.1%, respectively.
Calcium Magnesium Iron Zinc Manganese Spectrophotometry Slurry Triton X Standard additions calibration Surfactant