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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 23, Number 4
BKCSDE 23(4)
April 20, 2002 

 
Title
Synthesis and Characterization of Thermosensitive Poly(organophosphazenes)with Methoxy-Poly(ethylene glycol) and Alkylamines as Side Groups
Author
Bae Hoon Lee, Young Moo Lee, Youn Soo Sohn, Soo-Chang Song
Keywords
Thermosensitive poly(organophosphazenes), LCST, Methoxy-poly(ethylene glycol) (MPEG), Alkylamines.
Abstract
A simple and rapid technique for the separation and preconcentration of lead in water and biological samples has been devised. Preconcentration is based on the deposition of analyte onto a column packed with dithizone immobilized on sodium dodecyl sulfate coated alumina at pH ≥3. The trapped lead is eluted with 5 mL of 4-M nitric acid and determined by flame atomic absorption spectroscopy. A sample of 1 L, results in a preconcentration factor of 200, and the precision at 20 ㎍ L-1 is 1.3% (n = 8). The procedure is applied to tap water, well water, river water, vegetable extract and milk samples, and accuracy is assessed through recovery experiments and by independent analysis by furnace atomic absorption.
Page
549 - 554
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