Metrohm 2.946.0010, Руководство пользователя

Страница: 64 / 81

7.3 Application problems
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
56
￭￭￭￭￭￭￭￭
Problem Cause Remedy
sider the linear working range of the method
(see chapter 7.4.1, page 60) .
The observed peak is not
from the analyte.
￭
Adapt the evaluation so that the correct
peak is evaluated (see
Adapting the base-
line parameters for all curves (page 30) ,
Adapting the base points for an individual
curve (page 31)
or Excluding a curve from
the evaluation (page 30) ).
￭
Identify the interference and remove it
from the measuring solution.
Peak evaluation -
the peaks are not or
not correctly evalu-
ated. Peak shifted. There are various reasons why a peak can shift
(see
Peak position - the peak in the sample as
well as for the standard addition has shifted. ).
Identify the problem and eliminate it if possi-
ble.
Wrong characteristic
potential. Adapt the method parameter Characteristic
potential on the tab Evaluation in accor-
dance with the peak position (see "Adapting
the peak recognition", page 29) .
Wrong evaluation parame-
ters. The method parameters Tolerance , Min.
width , Max. width and Min. measured
quantity on the tab Evaluation are thresh-
olds for the peak acceptance. Check these
parameters and adapt them in accordance
with the peak shape.
Substance evaluation not
active. Make sure that the checkmark in the column
Active , table Substances on the tab Evalua-
tion , is set.
Original curves are dis-
played. Make sure that the option Show original
curves under Main menu
▶
View is not
checked.
Peak height - the
replicative measure-
ments differ signifi-
cantly. The electrode is not in a
good condition. Clean the electrode as recommended in the
application documentation and repeat the
determination. If the situation does not
improve, replace the electrode by a new one.
The curves are generally
very noisy. See Curve shape - the curves are very noisy.