提出在 pH为 5～ 6的HAC -NaAC介质条件下 ,用巯基棉富集天然水中铅 ,以 0 .0 5mol/LHCl溶液洗脱铅 ,采用HG -AFS法在K₂Cr₂O₇-H₂O₂-K₃Fe(CN)₆存在的酸性体系中测铅 ,方法的检出限为 0 .11μg/L ,RSD %为 4.40 % ,加标回收率在 98%～ 10 4%之间。

In a pH =5 ～ 6 HAC -NaAC buffer solution , lead in natural water is preconcentrated with sulfhy dryl cotton .The solution of 0 .05 mol/L HCl is used as eluant .The eluation of lead is determinated by HG -AFS in the system of K2Cr2O7 -H2O2 -K3Fe(CN)6 -HCl.The detection limit for lead is 0 .11 μg/ L , and RSD %of 4.40 % and the recovery rate is 98 %～ 104 %.