EHST 3701: Industrial Hygiene Laboratory
LABORATORY EXERCISE 3:
EXPOSURE TO AMORPHOUS AND CRYSTALLINE SILICA
I. OBJECTIVES
At the end of the session each student should be able:
1. To calculate the PEL for amorphous and crystalline silica
2. To interpret the acceptability of worker exposure to silica based on the obtained PEL
3. To discuss the possible health effects of silica exposure
II. LABORATORY EXERCISE
1. Given the following data for amorphous silica exposure:
Percentage of amorphous silica in air sample = 9.8%
Worker’s 8-hr TWA exposure = 7.2 mg/m3
a. Calculate the PEL. Show all computations. (1 pt)
b. Is the worker’s exposure acceptable based on the calculated PEL? (1 pt)
2. Given the following data for crystalline silica (respirable quartz) exposure:
Percentage of quartz in air sample = 4.7%
Worker’s 8-hr TWA exposure = 1.1 mg/m3
a. Calculate the PEL. Show all computations. (1 pt)
b. Is the worker’s exposure acceptable based on the calculated PEL? (1 pt)
c. Is the worker’s exposure acceptable based on the ACGIH TLV? (1 pt)
3. Given the following data for cristobalite (respirable) exposure:
Percentage of cristobalite in air sample = 2.8%
Worker’s 8-hr TWA exposure = 1.3 mg/m3
a. Calculate the PEL. Show all computations. (1 pt)
b. Is the worker’s exposure acceptable based on the calculated PEL? (1 pt)
4. Given the following data for crystalline silica exposure:
Percentage of quartz in air sample = 4.5%
Percentage of cristobalite in air sample = 2.7%
Worker’s 8-hr TWA exposure = 0.59 mg/m3
a. Calculate the PEL. Show all computations. (1 pt)
b. Is the worker’s exposure acceptable based on the calculated PEL? (1 pt)
5. What are the possible health effects of exposure to crystalline silica? (1 pt)
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