California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 16 - Control of Hazardous Substances
Article 110 - Regulated Carcinogens
Appendix B - Substance Technical Guidelines Arsenic, Arsenic Trioxide, Arsenic Trichloride (Three Examples)

Current through Register 2024 Notice Reg. No. 38, September 20, 2024

I. Physical and Chemical Properties

A. Arsenic (metal).

1. Formula: As.

2. Appearance: Gray metal.

3. Melting point: Sublimes without melting at 613°C.

4. Specific Gravity: (H2O = 1): 5.73.

5. Solubility in water: Insoluble.

B. Arsenic Trioxide.

1. Formula: As2O3' (As4O6).

2. Appearance: White powder.

3. Melting point: 315°C.

4. Specific Gravity (H2O = 1): 3.74.

5. Solubility in water: 3.7 grams in 100cc of water at 20° C.

C. Arsenic Trichloride (liquid).

1. Formula: AsCl3.

2. Appearance: Colorless or pale yellow liquid.

3. Melting point: -8.5° C.

4. Boiling point: 130.2° C.

5. Specific Gravity (H2O = 1): 2.16 at 20° C.

6. Vapor pressure: 10mm Hg at 23.5° C.

7. Solubility in Water: Decomposes in water.

II. Fire, Explosion and Reactivity Data.

A. Fire: Arsenic, Arsenic Trioxide and Arsenic Trichloride are nonflammable.

B. Reactivity:

1. Conditions Contributing to Instability: Heat.

2. Incompatibility: Hydrogen gas can react with inorganic arsenic to form the highly toxic gas arsine.

III. 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 sodium hydroxide.

The method of sampling and analysis should have an accuracy of not less than plus or minus 25 percent (with a confidence limit of 95 percent) for 0.01 mg per cubic meter of air (10 [MICRO]g/m3) and plus or minus 35 percent (with a confidence limit of 95 percent) for concentrations of inorganic arsenic between 0.005 and 0.01 mg/m3.