Evaluation of Encapsulated and Gelled Chloropicrin Formulations for Use in Wood Poles
Keywords:Chloropicrin, fumigant, wood, poles, gel, encapsulate, preservative
AbstractGelling (increasing a fluid's viscosity) and encapsulation were evaluated as means to improve the handling properties of the fumigant chloropicrin during application in the remedial preservative treatment of poles and other timbers. Several gelling agents, at concentrations of < 5% (w/w), were capable of increasing the viscosity of chloropicrin above 100,000 centipoise. The form of the dispensed gel allowed for a reduced surface area during application (when compared to liquid chloropicrin) and volatility of the gelled formulation was effectively reduced. However, addition of gelling agents to chloropicrin did not reduce the relative volatility from equivalent exposed surface areas. An evaluation of methods for dispensing one gelled formulation identified a modified pressure cylinder as a means for safer and easier application of chloropicrin compared with currently used methods. Polymer tubes for encapsulation were also evaluated as a means of handling and dispensing both liquid and gelled chloropicrin.
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