1.1 ,This test method covers sampling and analysis of liquid chlorine for the determination of oxygen (200 to 400 μ,g/g), nitrogen (400 to 800 μ,g/g), and carbon dioxide (800 to 1000 ppm) content at levels normally seen in liquid chlorine. Hydrogen and carbon monoxide concentrations in liquid chlorine are typically at or below the detection limit of this test method.