Investigation of trace level binding of PtCl6 and PtCl4 to alfalfabiomass (Medicago sativa) using Zeeman graphite furnace atomicabsorption spectrometry

JG Parsons, JL Gardea-Torresdey, KJ Tiemann, Gerardo Gamez Goytia

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)139-145
JournalAnalytica Chimica Acta
StatePublished - Feb 2003

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