As usual Geez!
Many factors come into play that aren't routinely observed or easily explained.
Geez's summary above touched on many of those issues.
As I was reading down through this thread, it brought to mind a statement that Geez made in the "hypo thread"?? that described Ibee's inclination to use less dh2o in the LWR than SWIG and Ibee uses more RP than SWIG.
Since Ibee always starts wet when mixing ingredients, the concerns of excess RP aren't the same as one would have if doing a dry rxn.
Having the highest HI concentration possible throughout the rxn is the main factor that determines complete reduction.
If the impurity producing mechanisms could be pinpointed, it would be easier to determine the ideal conditions that affect their removal or conversion.
With safeguards in place such as sufficient hydration throughout the rxn, excess RP is seen to balance the equation some and in Ibee's Eyes, it's seen as a benefit.
After all, the rxn will only consume as much RP as needed, so the remainder will be recoverable as well as a tad cleaner having undergone some extra scrubbing and conditioning toward it's next exposure to that environment.
(Provided it wasn't tainted or contaminated with gaak from unclean pfed)
If the dh2o ratio is overshot at any time and thereby weakening HI concentration during rxn, Excess RP could be thought of as a cushion to this condition provided the I2 ratio is suffient to keep the HI concentration constant on the High %age side.
The way Ibee looks at impurity creation/transition/conversion/elimination is this:
One must assume that the consumed(used) phosphorous in rxn has to go someware. The various changing states or gasphase changes taking place may play a larger role than suspected in dealing with the multitude of impurities created.
Just like Iodosides and the like.
But most of the I2 is recoverable. If it's not left attached to ephedrine or meth by prematurely pulling the rxn.
Ibee's point is this:
In a 10g rxn, ~3g of RP gets used and some of that must attach to something someware as it's not recoverable...Pooof! Gone!
Maybe it's phosphine, phosgene, or whatever phos gases that assist in these impurity transformations. Who knows?
But if they are responsible in some impurity creation, Ibee feels that allowing these side rxn to fully mature, run their course, and complete in rxn it might account for less of them beeing present in a product where the rxn wasn't running at it's fullest concentration.
Therefore Ibee looks at excess RP as a buffer or a cushion in assuring ideal HI concentration and recycling.
Now that I've left everyone as confused a me...
I feel better now!
While I've put much thought into this, it's not as easily described as I'd like but I think someone might get my drift on ware I wanted to GO with this!
Hey...I try