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Electrode vessel for liquids heavier and lighter than the liouid junction potential eliminator
May, 1926.1
U.S.
ELECTRODE THAN THE
BUREAU OF CHEMISTRY NOTES.
VESSEL FOR LIQUIDS HEAVIER LIQUID JUNCTION POTENTIAL
643
AND LIGHTER ELIMINATOR.'
By L. E. Dawson.
[ABSTRACT.]
AN ELECTRODEvessel for the measurement of the hydrogenion concentration of solutions having a density equal to or greater or less than that of the bridge solution has been developed in the Bureau of Chemistry. Sharp and reproducible liquid junctions or flowing junctions can also be conveniently and rapidly made between the electrode solution and the bridge solution by including the feature embodied in the apparatus of F. A. Elliott and Elliott and Acree. The ground-glass joints and the intricate stop-cocks of the Elliott-Acree apparatus, which can be made and repaired only by well-equipped and highly skilled glass-blowers, are not used, thus making the new apparatus less expensive and more durable. Furthermore, solutions containing suspended matter, such as quinhydrone in quinhydrone electrode work or soil suspensions which would settle down into the bridge liquid in the Elliott or Elliott-Acree apparatus, may be tested without developing this difficulty. THE
PREPARATION AND P R O P E R T I E S O F M E T H Y L ISOPROPYL-QUINOLINE YELLOW:
By Max Phillipsand Marshall J. Goss.
[ABSTRACT.]
2.8-Diamethyl-5-isopropyl-quinoline was prepared from 2-amino-p-cymene by the application of the Doebner and Miller synthesis. Condensed with phthalic anhydride, it gave methylisopropyl-quinoline yellow. A comparison of the absorption of methyl-isopropyl-quinoline yellow with that of quinoline yellow failed to reveal any appreciable displacement in the absorption maximum through the methyl-isopropyl substitution. The disulpho derivative of methyl-isopropyl-quinoline yellow dyes wool and silk a greenish yellow. It is equal in fastness to the corresponding quinoline yellow derivative (Quinoline Yellow S). " Published in Y. Am. Chem. Soc., 47 (Aug., 1925) : 2172-2173. Published in J. Am. Chem. Soc., 48 (March, I926):823. VOL. 2OI. No. 12o5--46
U.S.
ELECTRODE THAN THE
BUREAU OF CHEMISTRY NOTES.
VESSEL FOR LIQUIDS HEAVIER LIQUID JUNCTION POTENTIAL
643
AND LIGHTER ELIMINATOR.'
By L. E. Dawson.
[ABSTRACT.]
AN ELECTRODEvessel for the measurement of the hydrogenion concentration of solutions having a density equal to or greater or less than that of the bridge solution has been developed in the Bureau of Chemistry. Sharp and reproducible liquid junctions or flowing junctions can also be conveniently and rapidly made between the electrode solution and the bridge solution by including the feature embodied in the apparatus of F. A. Elliott and Elliott and Acree. The ground-glass joints and the intricate stop-cocks of the Elliott-Acree apparatus, which can be made and repaired only by well-equipped and highly skilled glass-blowers, are not used, thus making the new apparatus less expensive and more durable. Furthermore, solutions containing suspended matter, such as quinhydrone in quinhydrone electrode work or soil suspensions which would settle down into the bridge liquid in the Elliott or Elliott-Acree apparatus, may be tested without developing this difficulty. THE
PREPARATION AND P R O P E R T I E S O F M E T H Y L ISOPROPYL-QUINOLINE YELLOW:
By Max Phillipsand Marshall J. Goss.
[ABSTRACT.]
2.8-Diamethyl-5-isopropyl-quinoline was prepared from 2-amino-p-cymene by the application of the Doebner and Miller synthesis. Condensed with phthalic anhydride, it gave methylisopropyl-quinoline yellow. A comparison of the absorption of methyl-isopropyl-quinoline yellow with that of quinoline yellow failed to reveal any appreciable displacement in the absorption maximum through the methyl-isopropyl substitution. The disulpho derivative of methyl-isopropyl-quinoline yellow dyes wool and silk a greenish yellow. It is equal in fastness to the corresponding quinoline yellow derivative (Quinoline Yellow S). " Published in Y. Am. Chem. Soc., 47 (Aug., 1925) : 2172-2173. Published in J. Am. Chem. Soc., 48 (March, I926):823. VOL. 2OI. No. 12o5--46