Determination of zinc in environmental water by flame atomic absorption spectrometry after cloud point extraction

After zinc ion reacted with 1-(2-pyridine azo)-2-naphthol(PAN) to form a hydrophobic complex,the complex was extracted into Triton X-100 non-ionic surfactant micelle phase,and then zinc in the phase was determined by flame atomic absorption spectrometry,so that a cloud point extraction-flame atomic absorption spectrometry for the determination of zinc in environmental water was developed.Various conditions influencing complexing reaction and phase separation were optimized.Under the selected experimental conditions,there was a linear relationship between absorbance and zinc concentration in the range of 0-3.0 μg/mL.The detection limit of this method was 0.86 μg/L.The RSD was 2.8% for six determination of 0.013 2 μg/mL zinc.This method has been applied to the determination of trace zinc in water with the recovery of 96.4%-102%.