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Final Report: DAQ00010 - Efficacy of phosphine fumigation in sealed farm silos

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In one trial, for example, head-space temperatures measured during the day were as high as 61 C. Gases expand as they are heated so the possible effects of diurnal heating and cooling of the head-space on phosphine leakage from the silo and phosphine distribution within the grain mass need investigation... Silos containing grain were pressure tested to give an indication of gas-tightness measured as the pressure halving time (P1/2)... In the project, phosphine concentrations were measured during storage mainly along the vertical mid-axis of the silo, but sometimes at other locations...