METHOD 900DETERMINATION OF WATER IN WASTE MATERIAL

2.1 A sample of the material to be tested is treated with a specially formulated calcium hydride reagent which reacts with water in the sample to liberate hydrogen gas as shown below: CaH2 + 2H20 6 Ca(OH)2 + 2H2 8 2.2 The reaction is carried out in a sealed pressure vessel and the resulting pressure is then measured using a specially designed meter. The results are displayed directly in weight or volume percent, depending on the sampling method used. 2.3 The reaction is quantitative, measuring all water present in the sample over the range