Zinc Phosphide Residue Determination in Alfalfa (Medicago sativa)

Autor:	Stephanie A. Volz, John J. Johnston, Eric J. Petty, Margaret J. Goodall, Richard E. Mauldin, Doreen L. Griffin
Rok vydání:	1997
Předmět:	Zinc phosphide Detection limit chemistry.chemical_compound Residue (complex analysis) Chromatography chemistry Hay General Chemistry Gas chromatography Medicago sativa General Agricultural and Biological Sciences Phosphoric acid Phosphine
Zdroj:	Journal of Agricultural and Food Chemistry. 45:2107-2111
ISSN:	1520-5118 0021-8561
DOI:	10.1021/jf960689k
Popis:	An analytical method for the determination of zinc phosphide (Zn3P2) residues in alfalfa ranging from 10 μg g-1 to 100 mg g-1 is described. Using a suspension of Zn3P2 in propylene glycol, Zn3P2 standards were prepared and midharvest alfalfa and dried hay control samples fortified to assess method recovery. Addition of 1% phosphoric acid to Zn3P2-containing samples produced phosphine (PH3) gas for headspace gas chromatography/flame photometric detection analysis. Response linearity was assessed for (8.9 × 10-5)−0.027 μg of Zn3P2 mL-1 headspace (r2 = 0.9914) and 0.027−2.02 μg of Zn3P2 mL-1 headspace (r2 = 0.9998) concentration ranges. Analyte recovery exceeded 81% for Zn3P2 fortification levels ranging from 0.010 to 100 μg g-1, and the method limit of detection was 2.1 × 10-3 μg g-1 in midharvest alfalfa and 3.9 × 10-3 μg g-1 in dried hay. Keywords: Zinc phosphide; phosphine; residues; Medicago sativa; alfalfa; gas chromatography/flame photometric detection
Databáze:	OpenAIRE
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