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Interferences in automated phenol red method for determination of bromide in water

January 1, 1982

The phenol red method for the determination of bromide in water has been automated by segmented flow analysis. Samples can be analyzed at a rate of 20 samples/h with a method detection limit, defined, as the concentration giving a signal about three times the standard deviation of replicate anaiyte determinations in reagent water, of 10 ??g/L. Samples studied include oil-field brines, halite solution brines, ground-waters contaminated with these brines, and fresh groundwaters. Chloride and bicarbonate cause significant positive interferences at levels as low as 100 mg/L and 50 mg/L, respectively. Ammonia gives a negative interference that is important at levels as low as 0.05 mg/L. An ionic strength buffer is used to suppress a positive ionic strength interference, correction curves are used to compensate for the chloride interference, the bicarbonate interference is minimized by acidification, and the ammonia interference is eliminated by its removal by ion exchange. Reaction product studies are used to suggest a plausible mode of chloride interference. ?? 1982 American Chemical Society.

Citation Information

Publication Year 1982
Title Interferences in automated phenol red method for determination of bromide in water
DOI
Authors C.L. Basel, J.D. Defreese, Donald O. Whittemore
Publication Type Article
Publication Subtype Journal Article
Series Title Analytical Chemistry
Series Number
Index ID 70011290
Record Source USGS Publications Warehouse
USGS Organization