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Effect of colloid-size copper-based pesticides and wood-preservatives against microbial activities of Gram-positive Bacillus species using five-day biochemical oxygen demand test

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Journal of Environmental Sciences 2021年第7期33卷 71-80页

作者： Ayenachew Tegenaw George ASorial Endalkachew Sahle-Demessie Department of Chemical and Environmental Engineering College of Engineering and Applied Science701 Engineering Research CenterUniversity of CincinnatiCincinnatiOH 45221-0012USA U.S.Environmental Protection Agency Office of Research and DevelopmentCenter for Environmental Solution and Emergency ResponseCincinnatiOH 45268USA

Copper-based pesticides and wood preservatives could end up in the environment during production,use,and end-of-life via different pathways that could cause unintended ecolog-ical and adverse health *** paper provides the effect of colloid-size Cu-based pesti-cides(CuPRO and Kocide),micronized Cu azole(MCA-1 and MCA-2)and alkaline Cu quater-nary(ACQ)treated woods,Cu^(2+),Cu^(2+) spiked untreated wood(UTW),and CuCO_(3) solutions against Gram-positive Bacillus species using five-day biochemical oxygen demand(BOD 5)stan-dard *** total Cu leached from MCA-1,MCA-2,and ACQ in Milli-Q water after 5 days were -0.1,-0.11,and -0.64 g/kg of wood,***,the form of Cu leached from MCA woods was mostly ionic(>90%).The total organic carbon(TOC)content of any tested wood(UTW/MCA-1/MCA-2/ACQ)was -99%of its corresponding total carbon(TC)content,whereas the TOC of any tested wood sawdust exceeded that of its corresponding piece/block by>300%.The dissolved oxygen(do)consumption value in the presence of Cu^(2+),CuCO_(3),CuPRO,and Kocide solutions was significantly influenced by Cu particles/***,the do consumption value in the presence of UTW/MCA-1/MCA-2/ACQ woods was significantly influenced by organics leached from *** the other hand,the do consumption of MCA sawdust was greater than(300%)that of MCA pieces/*** findings of this study provide more insight into how organics leached from woods significantly reduce the toxic effects of Cu ions against Gram-positive Bacillus species.

关键词： Gram-positive Bacillus species BOD_(5) Colloid-size Cu-based pesticides do consumption Leaching Wood preservatives

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