Nah, not as far as I'm aware. IMO it's not an accurate guide because, as I said, depending on the timing and in order to beat it...it is no great stretch of the imagination to suspect the smarties of employing slightly to significantly more slowly absorbed buffers than Arm & Hammer... and they certainly do exist....old mate Sodium Citrate for example.
It's quite true that the 2hrs prior will weed some of that out for sure, however the 2hrs post will weed ALL off that out, without any question. A 1st Year Chemistry Student could construct a buffer solution that would be a pretty fair chance of flying under the radar as far as a pre race TC02 test is concerned.
Post race TC02 testing however, not even the combined knowledge of all the greatest Chemists to have ever lived can roll it.