1. A worker is exposed to naphthalene vapor on the job. Based on OSHA permissibl

Question

1. A worker is exposed to naphthalene vapor on the job. Based on OSHA permissible exposure limits, what is the allowable concentration for (a) an 8-hr day? (b) a 15-min period? Is there any danger of absorbing the material through the skin? sure (based on OSHA standards) if the substance is respirable? 2. A worker is exposed to silica dust (crystalline quartz). What is the allowable expo CHAPTER 24 CHEMICALS 3. During an 8-hr day, workers in one plant are exposed to a mixture of three chemi cal vapors considered to have additive effects: nitrobenzene, 0.3ppm; ethyl acetate, 100ppm, exceeded? 2-butanone, 75ppm. Is the OSHA exposure standard for the mixture

Explanation / Answer

1. (a) an 8-hr day

According to OSHA, permissible exposure limit is 0.1 mg/m3 averaged over an 8-hour.

Naphthalene vapour (octachloronaphthalene) can cause skin irritation and rashes. Skin and liver is its target organs. Its symptoms include acne-form dermatitis, liver damage and jaundice.

2. 50 ?g/m3 averaged over an 8-hour day.

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