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Thallium <br />Thallium in solid form exists as thallium sulfate, thallium <br />acetate, or thallium nitrate, all of which are colorless, odorless <br />solids. <br />Soluble thallium compounds are very toxic and cause cumulative <br />intoxication. Many death have resulted from swallowing these <br />compounds. Swallowingsoluble thallium compounds can cause nausea, <br />vomiting, diarrhea, abdominal pain, and bleeding from the gut. <br />These symptoms are followed by drooping of the eyelids, crossed <br />eyes, weakness, numbness, and tingling of the arms and legs, <br />trembling, and pain and tightness of the chest. Hair may fall out <br />after two to three weeks. Sever intoxication may result in <br />prostration, rapid heartbeat, convulsions, and psychosis. Recovery <br />may be complete but permanent effects such as staggering, visual <br />difficulties, trembling, and -mental abnormalities have been <br />reported, and liver and kidney damage have occurred. <br />The TWA of the PEL for thallium compounds is 0.1 mg/m3. <br />9 52 <br />