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�M <br />1] <br />1.2-dichloroethene (1.2-DCE) <br />1,2-DCE, a mixture of the cis and trans isomers, is a liquid with <br />a slightly acrid odor. <br />Available data conflict on whether there is significant difference <br />in the toxicity from short-term exposure to trans-1,2-DCE versus <br />cis-1,2-DCE. Narcosis has been identified as the important effect <br />of inhalation. <br />The PEL for a mixture of the trans and'cis isomers is 200 ppm in <br />air. <br />24 <br />