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accuracy of ph measurment w.r.t calibration points


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5 replies to this topic

#1 rick112

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Posted 27 January 2012 - 02:26 AM

hi

what is the measurment accuracy of a sample solution with ph 3.8 by calibrating with buffers pH 4 and 7 or Buffers pH 4, 7 and 10 ??

thanks

#2 mdfenko

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Posted 27 January 2012 - 07:18 AM

are you asking for a number (eg percent)? if so, then the manual that came with the pH meter and/or the electrode should give you that.

if you're looking for confirmation then 3.8 is close enough to 4 to be considered reasonably accurate.
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#3 rick112

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Posted 29 January 2012 - 07:38 PM

hi

i was kind of trying to understand the effect of 2 point and 3 point calibration on pH reading

#4 mdfenko

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Posted 30 January 2012 - 11:46 AM

2 point calibration gives you a straight line

3 point calibration allows for the construction of a rudimentary curve which should yield a more accurate determination
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#5 rick112

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Posted 07 February 2012 - 10:51 PM

hi mdfenko

thanks for the info...is there a place where i can get in detail in formation about the same, i was doing some reading around...they are mentions also about there have been even mention in certain places about five point calibration...

#6 mdfenko

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Posted 14 February 2012 - 08:27 AM

this may help (after you get past the advertising):

Attached Files


talent does what it can
genius does what it must
i do what i get paid to do




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