Arsenic

Procedure
  1. Use wet ash HNO3/H2O2 digest chemicals and apparatus.
  2. Weigh 1 gram solid or liquid sample into digestion tube calibrated to 20 mL.
  3. Add about 7 mL HNO3 and let sit overnight with funnel in top under hood.
  4. Digest with HNO3 according to procedures.
  5. Instead of adding the third aliquot of H2O2, remove sample from digestion block.
  6. Add 10 mL 1:10 HNO3.
  7. Let cool for 15 minutes.
  8. Dilute with deionized water to the 20 mL mark.
  9. Pour into ICP test tube for analysis.

ICP Information

  1. Make 2 ppm standard from 1000 ppm stock (1:500).
  2. Make 2 ppm (50:100) and 0.5 (25:100) ppm solutions from 2 ppm standard.
  3. Set 2 ppm to 40, 1 ppm to 20, and 0.5 ppm to 10 on the ICP to account for the dilution factor.
  4. As wavelength - 189.042.