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Some info from Burks Back Yard.
Treated Pine For Vegie Gardens
The evidence against CCA treated pine isn’t strong, but the simple fact is that lots of people don’t trust it, won’t trust it and won’t use it because it has arsenic in it. And for them there is good news. There’s a new form of treated pine around called ACQ which is free of arsenic and chromium and offers real peace of mind, so see our box story on ACQ treated pine for more details on this.
But back to the CCA treated pine, as this is far easier to obtain than ACQ treated pine at the moment. First of all, why do they use copper, chrome and arsenic to treat timber? Well, the copper controls fungi and marine borers, the arsenic controls termites and other insects, and the chromium fixes these two chemicals in the timber.
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.
If you feel safe to use it then its fine. . If not don't use it. Simple. |
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与珊瑚礁和雨林浪漫相约-----凯恩斯大堡礁游记 (2011-9-29) 清凉 
楼主:richardyuan2009
发表于 2017-1-27 15:54
