The Photometers; Photometric Test Kits; Basic Principle; Spectroquant Cell Tests - wtw PhotoLab S6 Operating Instructions Manual

1. Photometers

1.2 The Photometers

The photometers that belong to the Spectroquant
Analysis System differ from conventional photo-
meters in the following important aspects:
The calibration functions of all test kits are elec-
tronically stored.
The measurement value can be immediately read
off from the display in the desired form.
The method is selected via the AutoSelect
function (bar code on the cells / on the
AutoSelector for reagent tests).

2. Photometric Test Kits

2.1 Basic Principle

By means of reagents, the component of a sample to
be analyzed is converted into a coloured compound
in a specific reaction. The reagents or reagent mix-
tures contain – in addition to the reagent selective for
the parameter to be determined – a number of auxi-
liary substances that are essential for the course of
the reaction. These include, for example, buffers for
adjusting the pH to the optimal value for the reaction,
2.1.1 Spectroquant
The most important part of these test kits is the cell.
Identification mark for the
correct insertion into the cell
compartment of the photo-
meter
Cat. No. of test kit
Designation of test kit
Details regarding contents
Special cell in
optical quality
Additional reagent(s)
Some cell tests, e.g. COD or nitrite, already
contain all the necessary reagents in one
and the same cell, and the sample must
merely be added using a pipette.
Release 07/03
®
®
Cell Tests
Quecksilber(II)-sulfat,
Schwefelsäure
Mercury(II) sulfate,
sulfuric acid
Mercure(II) sulfate,
acide sulfurique
Mercurio solfato ico,
acido solforico
7.91146.9080/01-61333567
The photometers possess AQA (Analytical Quality
Assurance) functions to assure the quality of the
measurement.
New methods can be downloaded from
our homepage www.merck.de and stored
permanently in your photometer.
For technical data and instructions for use please
refer to the section "Function description".
and masking agents that suppress or minimize the
influence of interfering ions.
The colour reactions are in most cases based on
modified classical – in many cases also normed –
analytical procedures. Details on the respective refe-
rence procedures are stated in the package insert or
else in the parameter overview.
Giftig
Toxic
Toxique
Tossido
In other tests, however for reasons of chemical com-
patibility it is necessary to separate the test into two
or three different reagent mixtures. In these test kits,
it is necessary to add – in addition to the sample –
the dosage reagent to the cell reagent.
Leakproof cap
Bar code for identification
in the photometer
Risk phrases
Highly precise dosage of
the reagent
III