A solution (15 mL) containing sample or standards of cadmium and lead ions and DT (3 mg L1 ) at pH of 7.0 was poured into a glass screw-cap conical-bottom centrifuge tube.
A solution (15 mL) containing sample or standards of cadmiumand lead ions and DT (3 mg L1) at pH of 7.0 was poured into aglass screw-cap conical-bottom centrifuge tube.