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Fate of 32P labelled phosphine in grain and grain fractions

Ren, Y., Jansen, M., Agarwal, M.ORCID: 0000-0002-8781-3850, Emery, R., Newman, J. and Cheng, H. (2012) Fate of 32P labelled phosphine in grain and grain fractions. In: 9th International Conference on Controlled Atmosphere and Fumigation in Stored Products, 15 - 19 October 2012, Antalya, Turkey pp. 178-184.

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Murdoch University Stored Grain Research Laboratory investigated the fate of 32P labelled phosphine in grain and grain fractions. Radioactively-labelled phosphine is a useful and sensitive tool to study residues of phosphine in grains and their fractions. This research will assist industry to improve phosphine fumigation practice. Five representative grains (wheat, barley, oats, canola and lupins) were fumigated with 32P labelled phosphine at 700 ppm and 25±2°C for two weeks exposure. Two types of residues were formed in grains from phosphine fumigation – phosphine residue and phosphine converted non-volatile residues. After one week exposure to atmosphere, the levels of 32P radioactive residue in the grains and their fractions were analysed. The results show that more than 85% of absorbed phosphine which was converted to non-volatile compounds cannot be removed by ventilation. Furthermore, 80-90% of non-volatile 32P residues were present in water and acid soluble extractions. Radiation imagery shows that more than 80% of 32P residues were located or distributed in the embryo, testa, pericarp and husk of wheat, barley, canola, lupins and oats. However, 90% of absorbed phosphine will be desorbed after one week exposure to the atmosphere.

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