Metrohm 726 Titroprocessor - Manual (Page 152)

8.3 MET
726 Titroprocessor, Instructions for use 146 146
ЪДДД EP Recognition ДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДД¿
³ ³
³ Equivalence points window min. EPC pH 0.500 ³
³ Gen. lower limit pH min upp. pH max ³
³ pK/HNP Evaluation off ³
³ ³
³ Windows Fixendpoints ³
³ EP# from ... to [pH] EPC [] F# M.value [pH] ³
³ ДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДД ДДДДДДДДДДДДДДДДД ³
³ 1 min max 5.0 1 off ³
³ 2 off off 5.0 2 off ³
³ 3 off off 5.0 3 off ³
³ 4 off off 5.0 4 off ³
³ 5 off off 5.0 5 off ³
³ 6 off off 5.0 6 off ³
³ 7 off off 5.0 7 off ³
³ 8 off off 5.0 8 off ³
³ 9 off off 5.0 9 off ³
АДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДД QUIT ÄÙ
min. EPC
General equivalence point criterion
0,1…0,5…9,999
The EP criterion is the lowest EPC value which an
equivalence point must fulfil to be recognized as such.
This value also applies as the basic setting for the indi-
vidual EP windows.
How to determine an EPC of an endpoint in METmode:
• Print ou the measuring point list of the titration in
question.
• Find the greatest change in the measured value
-->
∆∆
n
.
• The EPC value is the sum of the five measured value
changes near
∆∆
n
(before and after ∆∆
n
). Use unsigned
values.
• If both negative and positive measured value
changes are found near
∆∆
n
, add up 3 value changes
only. Use unsigned values anyway.
To suppress an EP, apply an EPC greater than the value
estimated and re-calculate the results.
To accept an EP, but suppress all minor EPs, choose an
EPC less than the value estimated.
EPC [ ]
Equivalence point criterion for EP recognition
0,1…0,5…9,999
An individual EP criterion can be selected for any EP
window. It must, however, always be greater than the EP
criterion for the general EP window.