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Estimation of Water in Superphosphates. By LEONARD DK KONINGH (Ned. Tydschr. Pharm., kc., 1896, 190--191).--In order to prevent volatilisation of free acid during ignition, in estimating the total amount of water in superphosphates, 5 grams of the sample is mixed with about 1 gram of freshly ignited magnesia, and the whole is then exposed to a dull red heat. If the sample contains ammonium sulphate, it must be remembered that although the sulphuric acid is completely retained by the magnesia,doi:10.1039/ca8967005541 fatcat:pqhqfopymrfx3gjhel4fdvkhzq