Thanks for the link bruffin.
The article links to a paper by Hem(2001) and your first quote is from from its abstract. Do you have access to the full text for it? In the abstract, it first talks about in vitro dissolution experiments which demonstrate that the alpha hydroxy carboxylic acid from interstitial fluid is capable of dissolving aluminium containing adjuvants although they did say that the dissolution experiments were 'perhaps not at typical body concentrations and temperatures'. Now, because I can't see the full text I'm not sure if they've gone into how much it is actually capable of dissolving and how that may differ under typical body concentrations and temperatures. Do you know?
Next, it mentions the New Zealand rabbit study which I think is Flarend et al. I do not have access to the full text so I can't confirm that in the references but I have seen it elsewhere. The abstract states:
"This study has demonstrated that in vivo mechanisms are available to eliminate aluminium-containing adjuvants after i.m. administration."
It doesn't say how much is eliminated and how much is retained but the ATSDR toxicological report on Aluminium also references that study and states:
"Following intramuscular administration of aluminum hydroxide or aluminum phosphate vaccine adjuvants in rabbits, increased levels of 26Al were found in the kidney, spleen, liver, heart, lymph nodes, and brain (in decreasing order of aluminum concentration) (Flarend et al. 1997)."
as well as looking at other studies and stating:
"Human and animal studies have investigated the aluminum retention in the body. Within the first day of receiving a single injection of 26Al citrate, approximately 59% of the dose was excreted in the urine of six subjects; 72 and 1.2% was excreted in the urine and feces, respectively, during the first 5 days (Talbot et al. 1995). At the end of 5 days, it was estimated that 27% of the dose was retained in the body (Priest et al. 1995; Talbot et al. 1995). "
Your second quote is from the article and is based on the Hem abstract so both quotes are effectively from/based on the same paper which didn't mention the retention of Aluminium from Flarend (the study it referenced) and has only said that the interstatial fluids 'are capable' of dissolving Aluminium containing adjuvants (albeit not in the typical body temperatures and concentrations) and that in vivo mechanisms 'are available' to eliminate Al-containing adjuvants. I'm not sure what they based 'rapidly eliminated' on either.