HippyLabRat wrote:
I'm using 50μl injections for my samples that are 25% water is that sufficient?
Hippy: if I had samples with 25% H2O, I'd use a 250µl gas tight syringe with a metal needle, and weigh at least 0.14 grams sample, to get good repeatability. I suck up sample into the syringe barrel, wipe off the needle with a disposable tissue, and weigh. I also wear disposable gloves to minimize any contamination weight. I just did over 25 competitive products this way.
HippyLabRat wrote:
The titration time is about 6½-7 min on my MT C20.
That's a lot, sounds like the old pyridine-solvent days. We use Aquastar Comp-5 or similar titrant, our titrations are like 2 minutes. Are you positive that you are not getting "drift" from atmospheric moisture? I'd check ALL my seals, then double check.