Application of chemically modified probe-atomic absorption spectrometry (CMPAAS)-I. Determination of Bi in copper alloy and lead by trioctylphosphine oxide-coated tungsten probe-AAS.

A trioctylphosphine oxide (TOPO) coated tungsten probe has been prepared and used for the determination of Bi and the mug/g level in copper alloy and lead. Bismuth is preconcentrated on the probe which is placed in a graphite-cup furnace for AA determination of bismuth. The method has good sensitivity and minimises analysis time.

Indirect determination of trace phenol in water by atomic-absorption spectrophotometry.

An indirect method for determination of trace phenol in water by atomic-absorption spectrophotometry (AAS) is described. The phenol is brominated in acidic solution with KBrO(3)-KBr solution at room temperature. The excess of bromine is reacted with KI and the I(2) produced is extracted into cyclohexane and then reduced back to I(-) with ascorbic acid.