I once got meter calibration fluid from Hanna that was off by 50%...they refused to replace it or refund my money. It took 'pulling teeth' to get them to even admit it was defective...as compared to another sample from them using the same meter.
On Wed, Jul 8, 2020 at 10:26 AM Marshall <[email protected]> wrote: > There is no titration. This is the instrument: > https://www.hannainst.com/hi96737-silver-portable-photometer.html > > Marshall > > On 7/8/2020 8:36 AM, Ode Coyote wrote: > > Titration is not NEARLY accurate enough to measure 15 PPM > Even an AA Spectrophotometer has great difficulty at low concentrations > and 3 runs of the same sample averaged is the procedure > > ode > > On Tue, Jul 7, 2020 at 7:54 PM Marshall <[email protected]> wrote: > >> I am helping my son in law with his colloidal silver production. But I >> am running into something I don't understand. He has been using a hanna >> pure water meter to measure the ionic ppm. He has been applying a 1.1 >> correction factor, that is brewing for a 14 uS, to get 15 ppm. >> >> He just ordered and received a hanna silver ion colorimeter and we have >> been testing with it. When we dissolve the CS silver in nitric acid, >> the readings are way off, near zero. I am going to contact Hanna on >> that, I am assuming that either the nitrate ion, or the pH is messing it >> up. >> >> But testing some week old CS, I am getting about 6 ppm on the >> colorimeter, but 12 uS (or about 13 ppm) on the conductivity meter. I >> don't know which one is wrong. Anyone have experience with the >> colorimeter? >> >> Thanks, >> >> Marshall >> >> >> -- >> The Silver List is a moderated forum for discussing Colloidal Silver. >> Rules and Instructions: http://www.silverlist.org >> >> Unsubscribe: >> <mailto:[email protected]?subject=unsubscribe> >> Archives: >> http://www.mail-archive.com/[email protected]/maillist.html >> >> Off-Topic discussions: <mailto:[email protected]> >> List Owner: Mike Devour <mailto:[email protected]> >> >> >> > >
