Determination of As(Ⅲ) using developed dispersive liquid-liquid microextraction and flame atomic absorption spectrometry

摘要

The method relies on selective complexation of As(Ⅲ) with a suitable chelating agent followed by dispersive liquid-liquid microextraction (DLLME) method. Flame atomic absorption spectrometry (FAAS) equipped with microsample introduction system was utilised for determination of As(Ⅲ). 1-Undecanol and acetone were used as extraction solvent and disperser solvent respectively. Some effective parameters on complex formation and extraction have been optimised. Under the optimum conditions, the enrichment factor of 108 for As(Ⅲ) was obtained from 9.8 mL of water samples. The calibration graph was linear in the range of 2-15μgL~(-1) with detection limits of 0.60 μgL~(-1) for As(Ⅲ). The relative standard deviation (R.S.D.) for ten replicate measurements of 5.00 μgL~(-1) of As(Ⅲ) was 6.2%. Operation simplicity and high enrichment factors are the main advantages of DLLME for the determination of As(Ⅲ) without necessity for hydride generation in water samples.