Hygienist

American Conference Governmental Industrial Hygienists, ThresholdEimit Values, Cincinnati, Ohio, 1982 cf. Deutsche Eorschungsgemeinschaft, Maximale Arbeitsplat kon ntrationen, 1983, Vedag Chemie, Weinheim, 1983, p. 15. 

Threshold Eimit Values and Biological Exposure Indicies, 5th ed., American Conference of Government Industrial Hygienists, Cincinnati, Ohio, 1986, p. 

Industrial Ventilation, 15th ed.. Sect. 4, American Conference of Governmental Industrial Hygienists, Committee on Industrial Ventilation, Lansing, Mich., 1978. 

American Conference of Government Industrial Hygienists (ACGIH) threshold limit value = 5 ppm on an 8-h time-weighted average. 

The OSHA permissible exposure limit (11) and the American Conference of Governmental Industrial Hygienists (ACGIH) estabHshed threshold limit value (TLV) (12) for fluorides is 2.5 mg of fluoride per cubic meter of air. This is the TLV—TWA concentration for a normal 8-h work day and a 40-h work week. 

Threshold Eimit Values for Chemical Substances and Physical Agents, 1992—1993, The American Conference of Governmental Industrial Hygienists, Cincinnati, Ohio. 

These salts are corrosive and are to be considered toxic because of the presence of Ag+ ions. The American Conference of Government Industrial Hygienists (ACGIH) (1992—1993) has adopted TWA values of 0.01 mg/m for silver metal and 0.01 mg/m for soluble silver salts. TWA for fluorides as F ions is 2.5 mg/m. The MSDS should be consulted prior to use. Skin contact and inhalation should be avoided. 

Formaldehyde is classified as a probable human carcinogen by the International Agency for Research on Cancer (lARC) and as a suspected human carcinogen by the American Conference of Governmental Industrial Hygienists (ACGIH). This is based on limited human evidence and on sufficient evidence in experimental animals (136). Lifetime inhalation studies with rodents have shown nasal cancer at formaldehyde concentrations that overwhelmed cellular defense mechanisms, ie, 6 to 15 ppm. No nasal cancer was seen at 2 ppm or lower levels (137). 

The next step in the procedure is to form a committee comprised of people with expertise specific to the process and chemistry involved. The committee could also include an industrial hygienist, an environmentalist, the process operators, a consultant, and others. The committee should not contain more than a dozen individuals. 

Industrial hygienists work closely with members of several other professions concerned with workplace health and safety, eg, occupational medicine, occupational health nursing, and safety engineering. AH of these groups are involved in the implementation of the laws that regulate workplace health and safety. In the United States the principal law is the Occupational Safety and Health Act (OSHA) (1) enforced by the U.S. Department of Labor (U.S. 

A partial Hst of the hazards or conditions arising from the workplace (see also Plant safety) and with which industrial hygienists are concerned includes... 

The U.S. Occupational Safety and Health Administration (OSHA) has set a ceiling level for iodine of 0.1 ppm in air. The American Conference of Government and Industrial Hygienists (ACGIH) estabUshed 0.1 ppm as the TLV (TWA) for iodine. The maximum allowable concentration in air (MAK value) is also 0.1 ppm (104—106). 

American Conference of Governmental Industrial Hygienists P.O. Box 1937 Cincinnati, Ohio 45201 Practices, analytical methods, guides to codes and/or regulations, threshold limit values. 

The 1994—1995 threshold limit values as recommended by the American Conference of Governmental Industrial Hygienists (ACGIH) are given in Table 8. These time-weighted average values are those levels to which nearly all workers may be exposed for an 8-h workday and a 40-h work week without adverse effect (99). 

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