"some things found in tire mulch (and therefore tires)" wrote:
■Benzothiazole: Skin and eye irritation, harmful if swallowed. There is no available data on cancer, mutagenic toxicity, teratogenic toxicity, or developmental toxicity.
■Butylated hydroxyanisole: Recognized carcinogen, suspected endocrine toxicant, gastrointestinal toxicant, immunotoxicant (adverse effects on the immune system), neurotoxicant (adverse effects on the nervous system), skin and sense-organ toxicant. There is no available data on cancer, mutagenic toxicity, teratogenic toxicity, or developmental toxicity.
■n-hexadecane: Severe irritant based on human and animal studies. There is no available data on cancer, mutagenic toxicity, teratogenic toxicity, or developmental toxicity.
■4-(t-octyl) phenol: Corrosive and destructive to mucous membranes. There is no available data on cancer, mutagenic toxicity, teratogenic toxicity, or developmental toxicity.
■Zinc: There is a very large amount of zinc that is added in the manufacturing of tires and therefore there is a great deal of zinc.
Other Chemicals that are often found in rubber tires are:
■Benzene: Carcinogen, Developmental Toxicant, Reproductive Toxicant
■Phthalates: Suspected Developmental Toxicant, Endocrine Toxicant, Reproductive Toxicant
■PAHs: Suspected Cardiovascular or Blood Toxicant, Gastrointestinal or Liver Toxicant, Reproductive Toxicant ,Respiratory Toxicant,
■Maganese: Gastrointestinal or liver toxicants
■Carbon Black: Carcinogen
■Latex: Causes allergic reactions in some people
Why is rubber tire mulch a problem for gardens?
■The rubber mulch has an excess amount of zinc - and the excess zinc stunts the growth of plants. See North Carolina's Department of Agricultural's study on
rubber mulch -http://www.ncagr.com/agronomi/pdffiles/rubber.pdf
■There is the potential for ground water contamination from the chemicals in the ground up rubber tire mulch. For people on residential wells, this is particularly worrisome.
■If the rubber mulch is used on vegetable gardens there is the possibility that the plants will take-up the chemicals found in the used tire mulch.
■The companies producing and selling ground-up rubber tire mulch do not fully explain where the rubber mulch comes from nor the potential danger it presents to gardens, soil contamination, ground water and humans.
Jonathan Hontz wrote:The tires are debateably harmful. The link goes to the Earthship Biotecture website, where they've been building with tires for decades. They are primarily packed full of earth and also covered because the tires will biodegrade when exposed to UV, but when buried they remain inert. You're not building an Earthship, but there is a certain similarity there. So in the presence of conflicting evidence, you'll have to read up on both sides and come to your own conclusion.
Hope that helps.
Planting vegetables, particularly potatoes in stacks of tires is pretty popular these days, but there is a growing question whether tire gardens are safe. While there has been no direct research on whether it is safe to grow vegetables in tire gardens, there is research that shows that as tires get older they degrade. According to Linda Chalker-Scott, Associate Professor and Extension Urban Horticulturist, WSU Puyallup Research and Extension Center, we do know that "rubber tires will be a constant source of leached metals, PAHs, and other pollutants as the tires degrade. Whether or not it's enough to worry about from a human health perspective is unknown."