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 effects.This paper...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 effects.This 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 test.The 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,respectively.However,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/ions.However,the DO consumption value in the presence of UTW/MCA-1/MCA-2/ACQ woods was significantly influenced by organics leached from woods.On the other hand,the DO consumption of MCA sawdust was greater than(300%)that of MCA pieces/block.The 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.展开更多
文摘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 effects.This 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 test.The 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,respectively.However,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/ions.However,the DO consumption value in the presence of UTW/MCA-1/MCA-2/ACQ woods was significantly influenced by organics leached from woods.On the other hand,the DO consumption of MCA sawdust was greater than(300%)that of MCA pieces/block.The 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.
