水中痕量pb^(2+)的石墨炉原子吸收法测定

Determination of Trace Amounts of Pb^(2+) in Water by Graphite Furnace AAS

以Nafion修饰电极预富集—石墨炉原子吸收分光光度法测定水体中痕量pb^(2+)。方法的线性范围为1.2～100μg/l。9次平行测定的相对标准偏差为0.2％;检出限为0.6μg/l;10多种共存离子不干扰测定。

Trace Pb(Ⅱ) in water samples was preconcentrated with electrotytic deposition by Nation chemically modified electrode, and then put into a graphite furnace for atomic-absorption spectrophotometric measurement. Experimental result indicated that this method has high sensitivity and selectivity.A linear range for determination was 1.2-100μg/ml. Nine par allel determinations of a solution containing 40 μg/ml Pb(Ⅱ)gwve a relative standard deviation of 0.179%. The detection limit was 0.6 μg/ml. Several foreign ions existed did not interfere the measure ment.