LaMotte SMART Spectro Spectrophotometer - Manual (Page 79)

APPLICATION: Drinking, surface, and saline waters; domestic and
industrial waters and wastes.
RANGE: 0.0 – 22.0 ppm Bromine
MDL: 0.3 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.
INTERFERENCES: 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.
BROMINE, UDV SMART Spectro Test Procedures 2.11
Test P
rocedures