Hi Rnagel,
No … latex would be certified either through Oeko-Tex or Eco-Institute which are both more stringent certifications than CertiPur. All the latex you are likely to encounter (Dunlop or Talalay and made with natural or synthetic rubber or a blend of the two) would all be certified and be a “safe” choice. There is more about the different types and blends of latex in post #6 here.
CertiPur certification would only apply to polyurethane foams which include regular polyfoam and memory foam including versions of both that include gel or that have replaced some of the petrochemical polyols with polyols that are derived from plant oils.
I would use the same criteria for any “soy foam” in a mattress as regular polyfoam. They are just different versions of polyurethane foam. Most of the polyfoam made in North America is CertiPur certified so if the polyfoam (soy foam or otherwise) is made in North America I would treat it as “safe” unless you have a health condition (such as MCS) or other known sensitivity that indicated that what was safe for most people may not be the best choice for you. There are also some people who prefer to avoid any synthetic materials in their mattress for personal reasons regardless of whether they may be “safe” or not and would make their choices accordingly. If it comes from outside of North America (especially Asia or China) then I would definitely make sure it was CertiPur certified.
Phoenix