Quinoline-8-thiol functionalized solid phase extractant for the preconcentration of ultratrace amounts of mercury (II)

Abstract

569-572A solid material consisting of quinoline-8-thiol functionalized naphthalene provides a convenient, rapid and economical method for preconcentration of mercury. The mercury-quinolinc-8-thiol complex is quantitatively retained on naphthalene in the pH range 5.0-7.0. The solid mixture consisting of the metal complex together with naphthalene is dissolved in 2 ml of acetone and mercury content established spectrophotometrically. The calibration graphs are linear over the mercury concentration range 0.002-0.2 μg/ml. Ten replicate determinations of 1.0 μg of mercury present in 250 ml of solution gave a mean absorbance of 0.02 with a relative standard deviation of 3.1 %. The detection limit (corresponding to 3 times the standard deviation of the blank) and enrichment factors are found to be 0.001 μg/ml and 125 respectively. The accuracy of the developed preconcentration procedure has been tested by analyzing human hair standard reference material and human hair samples