Pyrrolidinedithiocarbamate AS A Reagent for Gc Analysis of Metal Ions

Dithiocarbamates have been extensively studied and reported as complexing reagents for a large number of metal ions for the solvent extraction, spectrophotometric and high performance liquid chromatographic (HPLC) determination of metal ions. They form coordinatively saturated, neutral metal chelates, which are easily extractable in organic solvents. They also provide adequate shielding to the metal ions to enable them to eluate from a GC column. The GC of metal chelates of diethyl dithiocarbamate, di(trifluoroethyl)dithiocarbamate and pentamethylenedithiocarbamate from packed and capillary columns have been reported. Pyrrolidinedithiocarbamate (PDTC) has advantages as an analytical reagent for metal analyses because of its complexation in acidic media. A number of studies have been made for HPLC determination of metal ions using PDTC, but the GC is characterized by increased resolving power with respect to HPLC and GC involves less running cost than HPLC. The conversion of the analyte selectively to volatile product, could possibly remove a number of matrix effects. The present work focuses to extend the range of complexing reagents for GC separation and analysis of metal ions. Pyrrolidinedithiocarbamate (PDTC) chelates of Cu(II), Ni(II), Fe(III), Mn(II), were extracted in MIBK and subjected to capillary gas chromatography. The research work was carried out on the capillary column; DB-1701 column (30 m x 0.25 mm, id, film thickness 0.25 mm) installed in Network GC 6890 (Agilent Technologies, USA) coupled with FID detection system. The metal chelates were subjected to capillary GC for the determination of Cu(II), Ni(II) and Fe(III) from Pakistani currency 5 rupee coin and municipal waste water sample of Hyderabad (Sindh). The results were compared by AAS