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The synthetic slow release fertilizers often contain elevated levels of toxic metals, unless the fertilizer is made and labeled specifically for vegetables and fruits. Read your labels carefully if you're going to use these kinds of products.
Hmmmm... No disrespect man, but I don't think I've ever seen toxic metals in any fertilizer MSDS I've ever read -organic or inorganic.
Most everything is manufactured for veggies and fruits... What you buy at home depot is the same stuff they spray on fields in Iowa. Just repackaged for the "home user"
That said... Inorganic ferts are non-renewable. They mine the stuff, and the phosphorus mining is really bad for the environment.
Peace