Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: The role of particle size of particulate nano-zinc oxide wood preservatives on termite mortality and leach resistance | Clausen et al. Nanoscale Research Letters 2011 6 427 http content 6 1 427 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access The role of particle size of particulate nano-zine oxide wood preservatives on termite mortality and leach resistance Carol A Clausen1 S Nami Kartal2 Rachel A Arango1 and Frederick Green III1 Abstract Historically most residential wood preservatives were aqueous soluble metal formulations but recently metals ground to submicron size and dispersed in water to give particulate formulations have gained importance. In this study the specific role nano-zinc oxide ZnO particle size and leach resistance plays in termite mortality resulting from exposure to particulate ZnO-treated wood was investigated. Southern yellow pine SYP sapwood impregnated with three concentrations of two particle sizes 30 and 70 nm ofZnO were compared to wood treated with soluble zinc sulphate ZnSO4 preservative for leach resistance and termite resistance. Less than four percent leached from the particulate nano-ZnO-treated specimens while 13 to 25 of the zinc sulphate leached from the soluble treated wood. Nano-ZnO was essentially non-leachable from wood treated with 5 formulation for the 30-nm particle size. In a no-choice laboratory test eastern subterranean termites Reticulitermes flavipes consumed less than 10 of the leached nano-ZnO-treated wood with 93 to 100 mortality in all treatment concentrations. In contrast termites consumed 10 to 12 of the leached ZnSO4-treated wood but with lower mortality 29 in the 1 treatment group and less than 10 5 and 8 respectively in the group of wood blocks treated with and ZnSO4. We conclude that termites were repelled from consuming wood treated with nano-ZnO but when consumed it was more toxic to eastern subterranean termites than wood treated with the soluble metal oxide formulation. There were no differences in leaching or termite mortality between the two particle sizes .
