Spectrophotometric Determination of Hg2+ after Solid Phase Extraction on Microcrystalline Naphthalene

Document Type : Research Paper




Mercury is quantitatively retained with 1, 5-diphenylcarbazone (DPC) on microcrystalline
naphthalene in the pH range 6.5-8.5 from a large volume of aqueous solutions of various samples.
After filtration, the solid mass consisting of the mercury complex and naphthalene was dissolved
in 5.0 mL of dimethylformamide (DMF) and mercury was determined by spectrophotometric
method at 542 nm against the reagent blank. The linear calibration range for mercury was 30-1800
1.tg L-1 in DMF solution with a detection limit of 20 lug L-1. The relative standard deviation for
eight replicate measurements of 1.0 [ig of mercury in 5.0 mL of DMF was 2.5%. The effect of
potential interfering ions was investigated and the proposed method was applied to the
determination of mercury in water samples.