To recipes helpdesk

Question

Posted on: March 6 2013

Several dentists ask for a stabilised solution of 3% sodium hypochlorite to prepare.

They use this for the disinfection of tooth root ducts after ontzenuwing before filling. Normally they are obtained from the Netherlands.
how to stabilize (without obstructing the release of active chlorine)?
Is The buffing here a sufficient solution (PH 8.5 or 11?)?
What about the correct chlorine degrees?

Answer

Normally one uses a concentrated hypochlorite solution to 12.5% chlorine. Given that it is not indefinitely stable, a titration is performed for diluting so that a lower content can be taken into account. As a formula, a solution with 1% chlorine in the Deutsche Arzneimittel Codex (DAC) is the following:
hypochlorite solution 12.5% chlorine qs
after carbonate qs
after bicarbonate qs
water up to 100g

for long Storage, the pH is set to approximately 11 for immediate use and for a powerful disinfectant effect pH = 9. If necessary, the pH should be adjusted when commissioning. In The first case one animates after carbonate; In the second bicarbonate to adjust the pH.
for both, the storage is preferably carried out in the refrigerator; especially outside light influence and in a polyethylene bottle. When stored at 20 ° C or in the refrigerator one speaks of a retention period of 3 months.
with regard to chlorometric degrees, we are mainly the French in which: 1 French degree corresponds to a concentration of 3.17 g chlorine per litre or 0.31% g/g. Javel Water possesses 12 or 8 French degrees. I believe that the latter is available at the wholesale trade. Eight degrees will then correspond to 2.45% (g/g) of active chlorine.