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// CODE SNIPPET

Appendix B Substance Technical Guidelines

OSHA 1910 General Industry > Z Toxic and Hazardous Substances > 1910.1018 Inorganic Arsenic > B Substance Technical Guidelines
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ARSENIC, ARSENIC TRIOXIDE, ARSENIC TRICHLORIDE (THREE EXAMPLES)
  1. Physical and chemical properties

    1. Arsenic (metal).

      1. Formula: As.
      2. Appearance: Gray metal.
      3. Melting point: Sublimes without melting at 613C.
      4. Specific Gravity: (H20=1):5.73.
      5. Solubility in water: Insoluble.
    2. Arsenic Trioxide.

      1. Formula: As203, (As406).
      2. Appearance: White powder.
      3. Melting point: 315C.
      4. Specific Gravity (H20=1):3.74.
      5. Solubility in water: 3.7 grams in 100cc of water at 20c.
    3. Arsenic Trichloride (liquid).

      1. Formula: AsC13.
      2. Appearance: Colorless or pale yellow liquid.
      3. Melting point: 8.5C.
      4. Boiling point: 130.2C.
      5. Specific Gravity (H20=1):2.16 at 20C.
      6. Vapor Pressure: 10mm Hg at 23.5C.
      7. Solubility in Water: Decomposes in water.
  2. Fire, explosion and reactivity data.

    1. Fire: Arsenic, arsenic Trioxide and Arsenic Trichloride are nonflammable.
    2. Reactivity:

      1. Conditions Contributing to instability: Heat.
      2. Incompatibility: Hydrogen gas can react with inorganic arsenic to form the highly toxic gas arsine.
  3. Monitoring and Measurement Procedures

    Samples collected should be full shift (at least 7-hour) samples. Sampling should be done using a personal sampling pump at a flow rate of 2 liters per minute. Samples should be collected on 0.8 micrometer pore size membrane filter (37mm diameter). Volatile arsenicals such as arsenic trichloride can be most easily collected in a midget bubbler filled with 15 ml. of 0.1 N NaOH.

    The method of sampling and analysis should have an accuracy of not less than + or - 25 percent (with a confidence limit of 95 percent) for 10 micrograms per cubic meter of air (10 µg/m3) and + or - 35 percent (with a confidence limit of 95 percent) for concentrations of inorganic arsenic between 5 and 10 µg/m3.

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