Hach-Lange LZV935 - DR 6000 Application Software Drinking Water - Handbuch (Seite 10)

English 10
Chemical and biological safety
During the analysis of the samples, the use of toxic, highly flammable or
corrosive chemicals can be required.
• Please observe safety information present on the packaging and
material safety data sheets.
• All consumed solutions must be disposed of in accordance with
local and national regulations and laws.
Introduction
The Drinking Water Analysis software LZV925 is a compilation of all
spectrophotometric applications that are relevant for drinking water
analysis. This software allows for individual parameters to be executed
without reagent addition through self absorption at various wavelengths.
For many analyses, the SIP 10 sipper offers the comfortable execution
of the test with a pour-through cuvette.
Selection of a stored test
1. Select STORED PROGRAMS. An alphabetically arranged list of all
available programs is shown. The methods of the Drinking Water
Analysis software LZV925 are located at the end of the list.
2. Select a program by choosing the corresponding test.
Note: The programs of the Drinking Water Analysis have the
numbers 2101 to 2107. Select
SELECT BY NUMBER and confirm the
entry with OK .
3. Press START to start the program.
Work procedures
Nitrate (self-absorption)
Principle
Nitrate can be determined from a water sample through self-absorption,
in other words without use of reagents. The nitrate ion is detected
bichromatically on two wavelengths. The difference between the
measured extinctions on these wavelengths is a measure for the nitrate
concentration and can be evaluated correspondingly through reference
to a standard concentration.
Application area
Drinking water
Measurement range
1–60 mg/L nitrate (3 mm rectangular cuvette)
0.3–15.0 mg/L nitrate (10 mm rectangular cuvette)
Accessories
• Spectrophotometer, 228 and 218 nm
• 3 mm or 10 mm rectangular cuvette QS
• Optional SIP 10 sipper: 3 mm or 10 mm pour-through cuvette QS
Reagents
• Standard 30 mg/L nitrate for 3 mm rectangular cuvette
• Standard 10 mg/L nitrate for 10 mm rectangular cuvette
Interferences
Organic substances can disrupt the determination. Nitrate
concentrations of over 100 mg/L can lead to results within the
measurement range.
D A N G E R
Working with chemical samples, standards and reagents is linked with danger. It
is recommended that the user of these products familiarize himself before the
work with safe procedures and the correct use of the chemicals and to read all
relevant safety data sheets carefully.