THE ABSORPTION SPECTRA OF INDICATOR YELLOW IN THE NEAR-ULTRAVIOLET AND THE VISIBLE REGION OF THE SPECTRUM
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概要
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(1) The absorption curve of indicator yellow was determined between 700 and 320 mμ over a range of hydrogen ion concentration from <I>p</I>H 5.2 to 10.0. The absorption maximum is at 420, 380 and 370 mμ at <I>p</I>H 5.2, 6.1 and 7.1-10.0 respectively. When the differential spectrum obtained by substracting the densi-ty of visual white from that of indicator yellow (representing the absorption of indicator yellow itself) was taken, the absorption maxima are at 440, 400, 380, 370 and 370 mμ at respectively <I>p</I>H 5.2, 6.1, 7.1, 8.2 and 9.0-10.0, and their heights are respectively 0.563, 0.500, 0.501, 0.743 and 0.810 when the absorption maximum of the visual purple is corrected to 1.000. The alkaline form has a narrower absorption band and the acid form a broader band. The form and height of the differential spectra at <I>p</I>H 9.0 and those at <I>p</I>H 10.0 are quite similar.<BR>(2) The change from indicator yellow solution to visual white solution by exposure to strong sunlight is more rapid in the acid form than in the alkaline form.
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