The first step would likely convert Cl2 to chloride ions. The most popular method to determine aqueous chloride content is by titration with an excess of silver nitrate. Silver nitrate (water soluble) nearly quantitatively reacts with chloride ions to form silver chloride (AgCl, water insoluble) in an acidic medium. The silver chloride precipitate is then dried and weighed. Divide the chlorine weight by the silver chloride weight (35/150 ish) to get the g Cl in the sample and finally divide by the sample weight to get a weight % or ppm value. There should be detailed procedures in "Quantitative Analysis" type books.
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