Study on the Solid Phase Extraction of Hg(II)-SBDTR Chelate with C_(18)Disks and Its Application to the Determination of Mercury in Tobacco and Tobacco Additive

摘要

A sensitive,selective and rapid method has been developed for the determination of mercury based on the rapid reaction of mercury(II)with p-sulfobenzylidenethiorhodanine(SBDTR)and the solid phase extraction of the colored chelate with Ci8 disks.In the presence of pH 3.5 sodium acetate-acetic acid buffer solution and Emulsifier-OP medium,SBDTR reacts with mercury(II)to form a red chelate of a molar ratio 1 :2(mercury to SBDTR).This chelate was prconcentrated by solid phase extraction with C_(18)disks.An enrichment factor of 50 was achieved.The molar absorptivity of the chelate is 1.28X10~5 L-mol~(-1)cm~(-1)at 545 nm in measured solution.Beer's law is obeyed in the range of 0.01-3 mug/rnL.The relative standard deviation for eleven replicates sample of 0.01 mug/mL is 1.65%.This method was applied to the determination of mercury in tobacco and tobacco additive with good results.