Bromo-PADAP is a dye agent for research use. Bromo-PADAP was reported for the spectrophotometric determination of uranium(VI). Bromo-PADAP is highly sensitive towards uranium, the uranyl complex having a molar absorptivity of 74,000 at 578 nm and pH 7.6. In the presence of a mixed masking solution only a few ions interfere seriously, and the method can be made specific for uranium by a preliminary extraction of uranium into tri-n-octylphosphine oxide, and direct development of the bromo-PADAP colour in the organic phase. Details are given for the determination of uranium in waters, ores, phosphoric acid and phosphate rocks, thorium oxide, and zirconium oxide.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.