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TABLE 1 <br /> Physiological Response to Various Concentrations of Hydrogen Sulfide <br /> H2S <br /> Concentration <br /> Response (ppm) <br /> Maximum allowable concentration for prolonged exposure,8 hours 10 <br /> (1,2) <br /> IDLH - level at which exposure is immediately dangerous to life and 100 <br /> health (3) <br /> Death possible/probable. Permanent nervous system damage. 400-700 <br /> Immediate death 1000 <br /> Note: Laboratories are often not able to properly analyze for tjS due'to its reactivity. <br /> Drager diffusion type tube monitoring may be generally adequate, however <br /> other interferants, (e.g., SO,,) are certain to be present and likely will render a <br /> falsely high reading, and therefore cannot be relied upon for accurate <br /> measurement. Note that when using Drager diffusion type tubes, some <br /> interferants may mask detection of the chemical of interest. <br /> References: <br /> 1 . American Council of Governmental Industrial Hygienists Threshold Limit <br /> Value. <br /> 2_ State of California Division of Safety, General Industry Safety Orders <br /> (#5155, <br /> 3. National Institute for Occupational Safety and Health (NIOSH), Pocket Guide <br /> to Chemical Hazards, September 1985. <br /> 4. Chemical Hazards in the Workplace, Procter, N. and Hughes, J.; J.B. <br /> Lippencort Co., Philadelphia, Pennsylvania; 1978 <br /> 1: 16 <br />