Hach-Lange GANIMEDE N - Manual (Page 29)

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Installation
3.3.2 Reagents for Ganimede N
The GCA 200 reagents for the automated sum determination of inorganically and
organically bound nitrogen are each designed for 100 determinations.
Inorganically and organically bound nitrogen is oxidized to nitrate with peroxodisulfate by
means of an alkaline digestion. The nitrate content is photometrically measured by means
of UV self-absorption in a differential measurement at 210 nm and 228 nm.
The opened solutions can be kept for seven days at room temperature.
Prepare the reagents according to the work instructions enclosed in the reagent
packaging.
3.3.3 Storage
The original substances are stored at room temperature. The fully prepared solutions are
stored in the refrigerator for brief storage (e.g. over a weekend).
The reagents remain in the analysis unit when the Ganimede is used daily.
3.3.4 Reagents reserve
A package of GCA 100 for Ganimede P or GCA 200 for Ganimede N is designed for
100 single analyses, and appropriate pre-rinsing amounts for 4–5 analysis series are
included per package. The maximum number of determinations can be reduced from 100
in the event of a higher number of analysis series per package.
A waste bottle can hold the reagent waste and sample waste of one package (i.e. 100
single determinations).
The exact reagent reserves of the chemicals can be shown by means of the menu items
OPTIONS, REAGENT STATUS.
3.4 Ganimede P sample preparation
• Samples must lie within the pH range 2–10.
• Samples that contain substances that react aggressively with Viton, e.g. solvents,
must be diluted.
• Samples containing particulates must be homogenized with a disintegrator for 30
seconds.
• Homogenized samples in positions 1 to 27 can be stirred with magnetic rods with the
sample tray for 36 sample containers.
• The sample containers are suitable for one-time use only. Residues of cleaning
agents can lead to increased phosphate findings.
3.4.1 Load the sample tray
Each sample tray is a sample batch.
If multi-point calibration is to be used, a standard curve with 2–11 measurement points
must be recorded before the measurement series. The device refers to this recorded
curve during measurement operation.
N O T I C E
The analysis unit N and the ready-to-use GaniChem-N GCA 200 reagent kit are adapted
optimally for each another. The use of third-party chemicals can result in the impairment of the
results and the whole system.
The guarantee claim only remains valid with the use of GaniChem-N GCA 200.