Bromine – LaMotte DC1600 Colorimeter User Manual

Page 19

BROMINE

APPLICATION:

Drinking, surface, saline waters; swimming pool water; domestic and industrial waters and

wastes.

RANGE:

0 – 10 ppm Bromine

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 disinfectants.