Standard Test Method for Determination of Gaseous Hexamethylene Diisocyanate (HDI) in Air with 9-(N-methylaminomethyl) Anthracene Method (MAMA) in the Workplace

Importancia y uso:

5.1 HDI is mostly used in the preparation of paints. The use of isocyanates and their industrial needs have been in constant growth.

5.2 Diisocyanates and polyisocyanates are irritants to skin, eyes, and mucous membranes. They are recognized to cause respiratory allergic sensitization, asthmatic bronchitis, and acute respiratory intoxication (4-7).

5.3 The American Conference of Governmental Industrial Hygienists (ACGIH) has adopted a threshold limit value – time weighted average (TLV – TWA) of 0.005 ppm (V) or 0.034 mg/m³ (8). The Occupational Safety and Health Administration of the U.S. Department of Labor (OSHA) has not listed a permissible exposure limit (PEL) for HDI (9).

5.4 In any case, there are not separate exposure standards for vapor and aerosol. Therefore, in comparing the results for isocyanate against a standard, results from the two fractions should be combined to give a single total value.

5.5 Due to its low LOD and low required volume (15 L), this test method is well suited for monitoring of respiratory and other problems related to diisocyanates and polyisocyanates. Its short sampling times are compatible with the duration of many industrial processes, and its low detection limit with the concentrations often found in the working area.

Subcomité:

D22.04

Referida por:

D6561-20, D4844-16

Volúmen:

11.07

Número ICS:

13.040.30 (Workplace atmospheres)

Palabras clave:

air monitoring; dual filter sampling system; hexamethylene diisocyanate; high-performance liquid chromatography; 9-(N-methylaminomethyl) anthracene; sampling and analysis; workplace atmospheres;