1.1 ,These test methods cover the determination of the total volatile organic chlorides in concentrations from 10 ,mg/kg to 100 ,mg/kg in butane-butene mixtures. The amperometric finish is not directly applicable in the presence of other substances that combine with silver ion or oxidize chloride ion in dilute acid solution. Bromides, sulfides, ammonia, tobacco smoke, and more than 25 μ,g of hydrogen peroxide in the test solution interfere in the spectrophotometric procedure.