When I titrate with phenalphaline indicator to determine residual oil in BD there seems to be a zero error when the BD has been purified. i'm trying various methods (as I think of them) to purify the BD to check this. Has anyone checked (calibrated) the titration method against chromatography or other methods of determining oil content? Harry
--- In [EMAIL PROTECTED], "Paul Gobert" <[EMAIL PROTECTED]> wrote: > > ----- Original Message ----- > From: "Burnett" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, June 10, 2001 4:40 AM > Subject: Re: [biofuel] titration ph question > > > > I have had the same problems with titration. My digital PH meter > > (i have 2 now) have both been calibrated with a 7 and 10 solution. > > My Solution of 1gm caustic and 1000ml distilled H2O has a PH of > > 12.2. > > Why don't we just measure the PH of the WVO directly with digital > > PH meters? > > "Burnett" as others have explained pH meters only give reliable readings in > ionic solutions and WVO is not usually ionic. > The pH value is an indication of hydrogen ion or hydroxide ion content of a > material. > Measuring the pH of water with a pH meter is difficult, you will notice that > the meter takes a long time to stabilise if it does at all. > As Todd has suggested pH papers would be more suitable. They offer a more > reliable, simpler and less expensive method. High tech they may not be but > they work. They made from a mixture of indicators impregnated into paper > strips. Can be purchased on reels in various ranges ie 6-8 or 8-10 etc. > Universal indicator solution is also useful. Again it is a mixture of > indicators. Another use for it is testing the pH of soils etc. Barium > sulphate is spread over the surface of the soil, universal indicator added > and the soil pH determined by matching the colour tinge of the barium > sulphate to the colour chart. > > Regards Paul > Various pH ranges are available Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send "unsubscribe" messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
