Selective extraction of bromide with liquid organic membrane

A novel separation technique for bromide in the presence of various anions with a liquid membrane was' reported. Initially, bromide ion was oxidized b y sodium dichromate in acidic media (aqueous or source phase), followed by a continuous chloroform extraction (organic phase). Next, a back-extraction of bromine into a second aqueous phase (receiving phase) containing nitrit e ions was conducted in order to reduce bromine into bromide. Parameters af fecting the transport efficiency as well as the influences of potential int erfering ions in this,bromide extraction method were studied. After a 70-mi n extraction period, 91.4 +/- 1.2% of the bromide ions were transported acr oss the liquid membrane. The developed extraction method was used for the d etection of bromide ions in seawater.