Function and setup multi N/C 2100S
36
Up to 20 calibration points can be used. For each calibration a tenfold detection can be
carried out. The calibration function can be calculated from the mean values of the
repeated measurements or from all individual detections.
The selection of the suitable calibration method is made by the user.
The TC channel is calibrated, directly for the TC parameter, after purging for the NPOC
parameter.
The calibration functions are calculated in accordance with the equations (6) or (7); the
following applies:
= (
) (8)
The calculated parameters appear in the method in the TC analysis channel. The
calculation of the analysis results is based on the calculated calibration function.
The TIC channel is calibrated. The calibration functions are calculated in accordance with
the equations (6) or (7); the following applies:
= (
) (9)
The calculated parameters appear in the method in the TIC analysis channel. The
calculation of the analysis results is based on the calculated calibration function.
Generally separate calibration functions are calculated for the channels TC and TIC in
accordance with the equations (6) or (7) for concentrations > 0.5 mg/l. The equations
(8) and (9) apply.
The calculation of the analysis results is based on the calculated calibration functions for
TC and TIC. The TOC content is then the result of the equation (10).
=
(10)
The calculated parameters appear in the method in the TIC and TC analysis channels.
The calibration takes place parallel by default, usually with mixed standards (e.g.
carbonate/hydrocarbonate and potassium hydrogen phthalate or saccharose).
The calibration of the TIC and TC channel can also be carried out consecutively with
separate standards. This is often useful if different ranges are to be calibrated for TC and
TIC.
The method NPOC plus is calibrated the same way as the method TOC(Diff). Before the
analysis the TIC must be sufficiently purged for the use of the differential method to be
meaningful.
separate calibration of TIC and TC channel
Measurement of samples and calculation of the analysis results
Purging the acidified sample (3 to 5 min)
detection of the remaining TIC content – concentration is calculated in accordance
with the calibration curve
TC/NPOC
TIC
TOC (Diff)
NPOC plus
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