A novel method was developed for the selective determination of lead (Pb) in environmental samples by displacement dispersive liquid-liquid microextraction (D-DLLME) combined with graphite furnace atomic absorption spectrometry (GFAAS). This D-DLLME method involves two steps of dispersive liquid-liquid microextraction (DLLME). Firstly, Zn2+ reacted with diethyldithiocarbamate (DDTC) to form the Zn-DDTC complex and was then extracted with the DLLME procedure. Then the sediment phase was dispersed into the sample solution containing Pb2+ with a dispersive solvent; then another DLLME procedure wa...
