RE:Can anyone comment on impurity testing needed ?paulbert wrote:
Can anyone comment on this quote from the NR - curious about the impurity testing going forward. (This is not a bash - I am an investor and just like to get a clear picture gpoing forward ) >>>>>>>>>>>>>>>>>>>>... Values at 100% should not be treated as pure products without additional impurity testing. The chemical analysis used to determine the total carbon content employs combustion of a sample followed by infrared detection on a LECO SC-632 instrument. The estimated measurement uncertainty for total carbon values greater than 50% C(t) is 1.4% (relative) with a resolution of 1 significant figure. For example, a reported assay value of 99.0% C(t) could therefore range between 97.6% and 100% C(t).
What it is saying is that, until the sample has been fully tested for every impurity there is an error margin of 1.4%. so a report of 99% purity could drop to 97.6% or go as high as 100% depending on further measurement.
It's the limitiation of the way LECO tests are done as far as I understand.