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A worker is exposed to 40 ppm acetonitrile for 2 hours, 48 ppm acetonitrile for 4 hours, and 12 ppm acetonitrile for 2 hours. What

A worker is exposed to 40 ppm acetonitrile for 2 hours, 48 ppm acetonitrile for 4 hours, and 12 ppm acetonitrile for 2 hours. What is the 8 hour TWA

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