Abstract
A method is described for the determination of copper in sea water by solvent extraction of itscomplex with 4-benzoy1-3-methyl-1-phenyl-5-pyrazolone (BMPP) into MIBK and subsequent analysisby atomic absorption spectrophotometry. To find the optimum conditions on the extraction of copperby BMPP-MIBK system, we examined the effects of pH, amount of BMPP and shaking time, respectively. The effects of coexisting diverse ions were also examined.
The recommended experimental procedure is as follows: 200ml aliquot of sea water containing 2 ml of concentrated hydrochloric acid, is boiled and then filtered using 1.0 micron membranefilter. The resulted solution is placed in a separatory funnel and 10 ml of diammonium hydrogencitrate (10 w/v%) is added. After adjusting to pH 7 with ammonia, the extraction is carriedout with 10 ml of 0.2 w/v% solution of BMPP in MIBK for 5 minutes. In order to avoid theinterference of the diverse ions in sea water, standard addition method is preferred in atomicabsorption spectrophotometry.
This method has been succeessfully applied to the determination of trace copper in sea water.
