There is little evidence that the arsenic in treated pine leaches into soils. Where the real concerns lay is when CCA treated pine is used in playground equipment, where toddlers, who will put virtually anything in their mouth, run the risk of chewing on a scrap of timber or soil which lies next to treated timber. Another real concern with CCA is when woodworkers cut it. Breathing in the sawdust from treated pine is a health hazard, and you should always wear a dust mask when cutting it, and keep spectators away. CCA treated pine should also never be burned, nor should it ever come in contact with drinking water.
So, with all those warnings, it’s no wonder that people shy away from CCA treated pine. But, as we have said earlier, there is little credible scientific evidence that when used as an edging material for garden beds, that it leaches arsenic into the soil.
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