LaMotte SMART Spectro Spectrophotometer - Manual (Page 91)

BROMINE
Like chlorine, bromine is an effective germicidal agent employed in drinking water
treatment, pool and spa water sanitation, food service sanitation, and other public
health applications.
APPLICATION: Drinking, surface, and saline waters; swimming pool
water; domestic and industrial waters and wastes.
RANGE: 0.00–9.00 ppm Bromine
MDL: 0.04 ppm
METHOD: In buffered sample bromine reacts with diethyl-p-
phenylene diamine (DPD) to produce a pink-red color in
proportion to the concentration of bromine present.
SAMPLE HANDLING &
PRESERVATION:
Bromine in aqueous solutions is not stable, and the
bromine content of samples or solutions, particularly
weak solutions, will rapidly decrease. Exposure to
sunlight or agitation will accelerate the reduction of
bromine present in such solutions. For best results start
analysis immediately after sampling. Samples to be
analyzed for bromine cannot be preserved or stored.
INTERFERENCE: The only interfering substance likely to be encountered
in water is oxidized manganese. The extent of this
interference can be determined by treating a sample
with sodium arsenite to destroy the bromine present so
that the degree of interference can be estimated.
Iodine and chlorine can also interfere, but these are
not normally present unless they have been added as
sanitizers.
CHLORINE, BROMINE, IODINE SMART Spectro Test Procedures 2.11
Test P
rocedures