Method improvement on detection of arsenic in workplace air with atomic fluorescence spectrometry

  Objective  To improve method for detection of arsenic in workplace air with atomic fluorescence spectrometry.

  Methods  With a nitric acid-perchloric acid solution digestion system, the samples were directly digested at 280 ℃ on an automatic temperature-controlled electric heating plate, and the arsenic in the workplace air samples was determined with standard curve method of atomic fluorescence spectrometer.

  Results  Within the concentration of arsenic ranging from 0 μg/L to 20 μg/L, the regression equation of standard curve was y = 60.660 3x – 16.099 0; the correlation coefficient was 0.999 5; the detection limit of arsenic was 0.021 9 μg/L; the lower limit of quantitation was 0.073 μg/L. Relative standard deviation of precision within a batch was 0.51% – 1.02% and relative standard deviation of inter batches precision was 2.25% – 4.38%. The recovery rate was between 100.36% and 102.35% for the detections.

  Conclusion  The method is accurate and stable, with low detection limit, simple operation and short time consuming, and could be applied in practical detection.