. Carnegie Institution of Washington publication. 56 ABSORPTION OF LIGHT BY WATER CHANGED The results obtained with aluminium sulphate bring out the same facts shown by calcium chloride and magnesium chloride, and also that water is more transparent in the region and more opaque at lju. That the sul- phate should not agree throughout with the chlorides is really not surprising, since the sulphates show abnormal results in almost every particular. This is probably due, in part at least, to the large amount of polymerization which the sulphate molecules in general undergo in the presence o
. Carnegie Institution of Washington publication. 56 ABSORPTION OF LIGHT BY WATER CHANGED The results obtained with aluminium sulphate bring out the same facts shown by calcium chloride and magnesium chloride, and also that water is more transparent in the region and more opaque at lju. That the sul- phate should not agree throughout with the chlorides is really not surprising, since the sulphates show abnormal results in almost every particular. This is probably due, in part at least, to the large amount of polymerization which the sulphate molecules in general undergo in the presence of even water as a solvent. It should also be remembered in the present connection that while calcium chloride and magnesium chloride crystallize with only 6 molecules of water, and are therefore only largely hydrated, aluminium sul- phate crystallizes with 18 molecules of water and is therefore very largely hydrated. The results in table 11 are the radiomicrometer deflections for a solution of aluminium sulphate and those for water having the same depth as the water in the solution in question, and the corresponding data for potassium chloride. A comparison of the two columns for potassium chloride and its corresponding water shows that the two are almost equally transparent to all the wave-lengths studied. A comparison of the aluminium sulphate with its corresponding water brings out the phenomenon that we are now discussing in a very pronounced manner. One other relation of a general character should be pointed out. The curves (figs. 12 to 17) show that the addition of salt to water shifts the absorption towards the longer wave-lengths. This is analogous to what had already been found by Jones and Uhler,1 Jones and Anderson,2 Jones and 80^ H20 70 60 50 40 30 i 201. CaCI2, Depth 2 cm. 11 12 Fig. 12. ' Cam. Inst. Wash. Pub. 60. 2Carn. Inst. Wash. Pub. Please note that these images are extracted from scanned page images that may have been digitally enhanced f
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