Movement of chloropicrin vapour in three Ghanaian wood species
1977
Oteng-Amoako, A.
A simple method for determing the rate of movement and release of chloropicrin vapour (an agricultural fumigant) in three Ghanaian wood species at a temperature of 26°C and 65% relative humidity, was initiated. The results of the two variables were compared to air permeability of the sample and their gravities. The results indicate that release rate and rate of movement of chloropicrin vapour among species were highest in Subaha (Mitrangyna stipulosa), followed by Dahoma (Piptadeniastria africanum) and least in Kaku (Lophira alata). Within the same species the rate of chloropicrin movement was faster in sapwood than in heartwood. The rate of chloropicrin release and ther permeability of the samples to air were statistically very significant showing that a knowledge of one test can be used to predict the result of the other. Among species, samples with higher specific gravity gave lower diffussion rate and lower air permeability. The reverse was true for species with lower specific gravity. It is recommended that a study is initiated using wood species in service, such as wooden telephone poles to ascertain the suitability of the chemical for remedial treatment on commercial scale.
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