SMART Spectro 2 Operator’s Manual 04.16
17
INTERFERENCES
LaMotte reagent systems are designed to minimize most common interferences. Each
individual test instruction discusses interferences unique to that test. Be aware of
possible interferences in the water being tested.
The reagent systems also contain buff ers to adjust the water sample to the ideal pH
for the reaction. It is possible that the buff er capacity of the water sample may exceed
the buff er capacity of the reagent system and the ideal pH will not be obtained. If this is
suspected, measure the pH of a reacted distilled water reagent blank using a pH meter.
This is the ideal pH for the test. Measure the pH of a reacted water sample using the pH
meter. If the pH is signifi cantly diff erent from the ideal value, the pH of the sample should
be adjusted before testing.
Chlorine interferences can be removed with the use of glycine. Very high levels of
chloramines may interfere if the test result is not read immediately. Oxidized manganese
interferes but can be removed with arsenite. Bromine and iodine interferes but can be
removed with a thioacetamide blank correction.
Interferences due to high concentration of the substance being tested, can be overcome
by sample dilution (see page 16).
STRAY LIGHT INTERFERENCE
Normal indoor lighting causes no interference with the SMART Spectro 2. Always be sure
the sample chamber lid is closed when scanning blanks or samples.
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