[AAS determination of trace lead, cadmium, copper and nickel by enrichment with 2-mercaptobenzimidazole chelating cellulose].

Chelating cellulose is of simple preparation,excellent nature and low cost. MBM chelating cellulose was prepared with good chelating reagent (2-mercaptobenzimidazole) grafted on cotton by indirect etherification method. Four heavy metal ions in one solution can be simultaneously preconcentrated and eluted under good condition. Results have shown that the approach for separating and preconcentrating trace of Cu, Pb, Cd and Ni has advantages of high exchanging speed, high preconcentration multiple, high selectivity, easy elution and excellent results.