Interactions of two or more toxic substances

Physical Classification This method of classification attempts to examine toxic agents according to the form in which they exist in the occupational environment. These classifications include solids, liquids, gases, and vapors. 

Chemical Classification This method of classification uses the chemical structure, nature, and composition that a substance possesses. Examples of chemical classifications include aliphatic compounds, aromatics, acids, alcohols, ketones, esters, and ethers. 

Physiological Classification This extensive method of classification uses potential human injury as a means of categorizing certain agents. Below are several physiological classifications. 

Irritants Chemicals that are not corrosive, but that cause a reversible inflammatory effect on living tissue by chemical action at the site of contact. 

Nephrotoxins Agents that produce kidney damage. Examples of these agents include heavy metals (such as cadmium, chromium, lead, and mercury), halogenated hydrocarbons (such as bromobenzene and carbon tetrachloride), antineoplastic drugs such as cisplatin, and others. 

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