Spectrophotometric determination of silver with 2-(3,5-dibromo-2-pyridylazo)-5-diethyl-aminophenol in the presence of anionic surfactant.
A sensitive and selective spectrophotometric method for silver has been established by reacting silver(I) with 2-(3,5-dibromo-2-pyridylazo)-5-diethylaminophenol (3,5-diBr-PADAP) in the presence of an anionic surfactant, sodium lauryl sulphate. The molar absorptivity is 7.7 x 10(4) l.mole(-1).cm(-1) at 570nm. The molar ratio of silver to 3,5-diBr-PADAP is 1:2. Beer's law is obeyed from 0.1 to 1 ppm of silver. With EDTA as masking agent, common ions do not interfere. The method has been applied to the determination of silver in waste water.
Hung
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Institute of Environmental Chemistry, Academia Sinica, P.O. Box 934, People's Republic of China.
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Wu
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