Blister canker of apple trees; a physiological and chemical study .. . 5-41 I 5-175-36 j S-iSSSo I S-3I 5 6 7 8 4-53 3-90 4-85 4-58 3-98 4-39 3-73 Graphs B and C in fig. 2 show that while diseased bark absorbsH+ ions to about the same extent as the healthy, the latter absorbsmore 0H~ ions; that is, its titration acidity is greater, whichis exactly the condition found by titration with N/20 sodiumhydroxide (30). The Ph values at points where B and C cross A igiQ] ROSE—BLISTER CA NKER 115. vlcC-^b ACETIC ACID to \ CC-y(o SOD, ACETATE TJZ 2:56 0
Blister canker of apple trees; a physiological and chemical study .. . 5-41 I 5-175-36 j S-iSSSo I S-3I 5 6 7 8 4-53 3-90 4-85 4-58 3-98 4-39 3-73 Graphs B and C in fig. 2 show that while diseased bark absorbsH+ ions to about the same extent as the healthy, the latter absorbsmore 0H~ ions; that is, its titration acidity is greater, whichis exactly the condition found by titration with N/20 sodiumhydroxide (30). The Ph values at points where B and C cross A igiQ] ROSE—BLISTER CA NKER 115. vlcC-^b ACETIC ACID to \ CC-y(o SOD, ACETATE TJZ 2:56 0. Fig. 2.—F^ of mixtures of bark, pyrogallol, and various buffer solutions beforeand after oxidation had ceased: A, P^ of buffer solutions; B, P^ of mixtures ofbuffer solutions, pyrogallol, and diseased bark before oxidation; C, P^ of mixturesof buffer solutions, pyrogallol, and healthy bark before oxidation; D, P^ of mixturesof buffer solutions, pyrogallol, and diseased bark after oxidation; E, P^ of mixturesof buffer solutions, pyrogallol, and healthy bark after oxidation. *Only acetic acidused here. ii6 EOT A L GA ZE T TE FEBRUARY (healthy bark about , diseased about ) agree well withthose determined without the buffer (Ph healthy = , diseased =); the latter are taken, therefore, to represent practically theactual acidity in each case. This is based on the assumption thatif the acidity of a buffer solution is the same as that of a mixtureof bark, pyrogallol, and water, no
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherchica, bookyear1919
