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.