Lovibond MD 610, Instruction Manual

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14 MD 610_1c 09/2015
1.1 Methods
The precision of Lovibond
®
Reagent Systems (tablets, powder packs and tube tests) is identical
to the precision specified in standards literature such as American Standards (AWWA), ISO
etc.
Most of the data referred to in these standard methods relates to Standard Solutions. Therefore
they are not readily applicable to drinking-, boiler- or waste-water, since various interferences
can have a major influence on the accuracy of the method.
For this reason we don’t state such potentially misleading data.
Due to the fact that each sample is different, the only way to check the tolerances (‘precision’)
is the Standard Additions Method.
According to this method, first the original sample is tested. Then further samples (2 to 4) are
taken and small amounts of a Standard Solution are added, and further results are obtained.
The amounts added range from approximately half, up to double the amount present in the
sample itself.
These supplementary results make it possible to estimate the actual concentration of the
original sample by comparison.
Literature
The reagent formulations are based on internationally recognised test methods. Some are
described in national and/or international guidelines.
1. Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung
2. Standard Methods for the Examination of Water and Wastewater; 18th Edition, 1992
3. Photometrische Analysenverfahren, Schwedt,
Wissenschaftliche Verlagsgesellschaft mbH, Stuttgart 1989
4. Photometrische Analyse, Lange / Vejdelek, Verlag Chemie 1980
5. Colorimetric Chemical Analytical Methods, 9th Edition, London
Notes for searching:
OTZ (OneTimeZero) switching on and off, see Mode 55, page 328
Active Oxygen -> Oxygen, activ
Alkalinity-m -> Alkalinity, total
Biguanide -> PHMB
Calcium Hardness -> Hardness, Calcium
Cyanuric acid -> CyA-TEST
H
2
O
2
-> Hydrogen peroxide
Monochloramine -> Chloramine, mono
m-Value -> Alkalinity, total
Total Hardness -> Hardness, total
p-Value -> Alkalinity-p
Silicon dioxide -> Silica
total Alkalinity -> Alkalinity, total
total Hardness -> Hardness, total
Langelier Saturation -> Mode function 70
Index (Water Balance)