I've never got any analysis done, but there a few labs in Cali that do it for a fee, like Steep Hill Lab in Oakland. The only problem is you gotta be from Cali to have it tested. I've also seen self test kits on the web, but I don't know how accurate they are.
I wrote "for a fee" lol Yeah, it seems pricey, but I think you need a spectrum analyzer to do it right. You might want to call the lab and find out what they use. If you got access to some university equipment, you might be set. Or know chem engineer major?