FAQ

In California Agricultural Sciences Center in 2016, a series of laboratory-scale exploratory fumigations with phosphine were conducted to evaluate the postharvest control of adult bean thrips. The  average  air temperature  ( x ),  4.9  ºC,  was  calculated  across  all trials. Three phosphine concentration were applied during research:  [PH3]ss of 250, 500, and 1000 ppmv,  As result we have that variability in [PH3]  between 250 and 1000 ppmv did not change the efficacy of fumigation but crucial part takes phosphine impact time.

We make a vital conclusion from the research that we cannot wait until phosphine diffuse through the bulk of load by its natural speed. For the sake of immediate effective gas influence from the first days of voyage, we have to apply forced gas distribution throughout hold space.

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In condition of hold preservation mixing phosphine gassing from tablets, take place by solely available way – diffusion. It means phosphine molecules penetrate between oxygen molecules. Gases diffusion in full load hold is very slow and depends on temperature. For example, according to Canadian University of Manitoba, if temperature will be 20 to 25⁰С, speed of phosphine penetration will be only 80cm per day. Besides, storage bottom aria never reaches required lethal concentration.

Recirculation system is uniqueness of the solution for in condition of natural air streams absence, which could distribute phosphine allover storage. Recirculation system represents closed loop vent structure oriented for breathing in gas from beneath coamings cover (maximum concentration location) and pump it to hold bottom. It allow even distribution all phosphine simultaneously it gassing from tablets.

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