Test Procedures
APPLICATION:
Boiler and cooling waters; domestic and industrial wastes.
RANGE:
0–50 ppm Silica
MDL:
1 ppm
METHOD:
Silica forms a complex with ammonium molybdate in an
acidic solution to produce a yellow color in proportion to
the amount of silica present. Phosphate also reacts with
molybdate but the addition of oxalic acid eliminates the
molybdophosphoric acid complex.
SAMPLE HANDLING &
PRESERVATION:
Silica samples may be preserved by refrigeration at 4°C in
plastic containers up to one week without any change in silica
concentration.
INTERFERENCES:
Sulfi des and large amounts of iron interfere. Color and
turbidity may be removed by standardizing the instrument
with the original water sample.
SILICA
, HIGH RANGE
SMART Spectro 2 Test Procedures 05.02.16
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