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|Title:||Phosphine Retention in New and Aged Fumigation Sheets|
|Abstract:||Newly acquired, and naturally- and accelerated-aged fumigation sheets of different types were tested for retention of phosphine under a lab setup. In a 24-h test the decreasing order of retention of the gas by the newly acquired sheets were: carbon impregnated low density polyethylene (LDPE) (225-250μ, 0 per cent gas loss) > polyvinyl chloride (PVC,255μ) > PVC coated fabric (310-335μ) > high density polyethylene (HDPE, 85μ) > LDPE without carbon impregnation (140μ) > multilayered cross laminated (280μ) > HDPE woven fabric with LOPE coating (260-330 μ) > LDPE (75μ) and HDPE (70μ) > multilayered cross laminated (140μ) > rubberised fabric painted with aluminium on one side (650 μ. 16 per cent loss). Sheet samples after accelerated ageing (exposed to 70 ±1°C for 7 d) showed higher. gas retention than the newly acquired sheets. Phosphine retention decreased significantly after natural ageing of sheets by keeping in the open and exposed to sunlight, wind and rain for 5 months. The results indicate that all sheet types tested , except the rubberized fabric, and carbon impregnated LDPE, multi layered cross- laminated and HDPE woven fabric coated with LDPE were suitable, for indoor and outdoor fumigation with phosphine, respectively. The accelerated ageing improved the phosphine retention properties of sheets in general.|
|ISSN:||0975-1084 (Online); 0022-4456 (Print)|
|Appears in Collections:||JSIR Vol.62(03) [March 2003]|
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