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CAS Registry Number: 83-32-9 Molecular formula: C12H10 Formula weight: 154.21 RTECS: AB1000000 Merck reference: 10, 22

Physical state, color, and odor: White crystalline solid or orthorhombic bipyramidal needles from alcohol. Odor threshold con-centration ranges from 0.02 to 0.22 ppm (Keith and Walters , 1992). In Wisconsin, the tas te and odor threshold concentration in water that is non-toxic to humans is 20 µg/L (ATSDR, 1995).