TY - JOUR
T1 - Investigation of trace level binding of PtCl6 and PtCl4 to alfalfabiomass (Medicago sativa) using Zeeman graphite furnace atomicabsorption spectrometry
AU - Parsons, JG
AU - Gardea-Torresdey, JL
AU - Tiemann, KJ
AU - Gamez Goytia, Gerardo
PY - 2003/2
Y1 - 2003/2
N2 - Batch laboratory experiments were performed to investigate the effects
of pH, chemical modification, time dependency, and interference studies
on the binding of trace concentrations of hexachloroplatinate(IV) and
tetrachloroplatinate(II) to alfalfa biomass. The pH profiles were
measured between pH 2.0 and 6.0. It was found that the binding of trace
concentrations of platinum(IV and 11) to alfalfa biomass was dependent
on pH with a maximum binding occurring at pH 3.0 and a minimum at pH
6.0. When the alfalfa biomass was chemically modified (esterified),
maximum binding occurred at pH 6.0 for both oxidation states of
platinum. From the batch time dependency experiments, it was found that
binding took at least 20 min to level off for both platinum oxidation
states. Batch experiments were performed with various concentrations of
calcium, magnesium, and sodium (0.1, 1.0, 10, 100 and 1000 ppm) and it
was found that calcium affected the binding of platinum(II and IV) to
the alfalfa biomass.
AB - Batch laboratory experiments were performed to investigate the effects
of pH, chemical modification, time dependency, and interference studies
on the binding of trace concentrations of hexachloroplatinate(IV) and
tetrachloroplatinate(II) to alfalfa biomass. The pH profiles were
measured between pH 2.0 and 6.0. It was found that the binding of trace
concentrations of platinum(IV and 11) to alfalfa biomass was dependent
on pH with a maximum binding occurring at pH 3.0 and a minimum at pH
6.0. When the alfalfa biomass was chemically modified (esterified),
maximum binding occurred at pH 6.0 for both oxidation states of
platinum. From the batch time dependency experiments, it was found that
binding took at least 20 min to level off for both platinum oxidation
states. Batch experiments were performed with various concentrations of
calcium, magnesium, and sodium (0.1, 1.0, 10, 100 and 1000 ppm) and it
was found that calcium affected the binding of platinum(II and IV) to
the alfalfa biomass.
M3 - Article
SP - 139
EP - 145
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
SN - 0003-2670
ER -