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Volume 59, Issue 4
Displaying 1-5 of 5 articles from this issue
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Tartrazine Lakes with Various Dye ContentsYasushi KUBO, Yoshifumi MAKITA1986 Volume 59 Issue 4 Pages 205-211
Published: April 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSTartrazine aluminum lakes with four levels of the dye anion content ranging from 28 to 37.5% were prepared using a substrate of aluminum hydroxide gel precipitated under a well-defined condition, and the effect of dye anion content was examined on the dye elution in NaCl aqueous solution. The limiting capacity of the substrate to combine the dye was found at the content of about 35%, and the four specimens corresponded to the four stages of dye saturation : unsaturated, transient from unsaturated to saturated, saturated and supersaturated, respectively. Dye elution curves characteristic of the four stages were obtained by measuring the concentration of eluted dye anion [D]s as a function of the lake/solution ratio Wp and time. The change of [D]s with Wp was in the reverse order only in the unsaturated case, wherea in the other three cases [D]s increased in keeping with Wp. The time-dependence of [D]s was different in the four cases as follows : (1) for the unsaturated, [D]s decreased with elapse of time, (2) for the transient, [D]s increased in the initial stage and then turned to decrease giving a maximum, and (3) for the saturated and the supersaturated, [D]s increased in the whole span of measurement.
The phenomenon observed in the unsaturated case resembled that of the equilibrium-attaining process in the ion exchange resin where the diffusion of counter ions within the ion exchange particle is rate-determining, These findings indicated thepossibility to improve the anti-eluting strength of aluminum lakes.View full abstractDownload PDF (729K) -
Sunset Yellow FCF LakesYasushi KUBO, Makoto SHIRAI1986 Volume 59 Issue 4 Pages 212-220
Published: April 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDye elution in NaCl aqueous solution was examined on Sunset Yellow FCF aluminum lakes from two sorts of origins : laboratory products prepared from an aluminum hydroxide substrate with various levels of dye contents, and manufacturers' products on the market. The concentration of eluted dye anion [D]s was measured as a function of the lake/solution ratio Wp and time, which gave three different types of elution curves with the following features : (1) [D]s decreased with elapse of time while it decreased with increasing Wp, except for the initial stage, (2) [D]s initially increased and then turned to decrease giving a maximum, while it increased with increasing Wp, and (3) [D]s increased consistently in the whole span of measurement with the same dependence on Wp as in the second case.
The phenomenon in the first case was interpreted as the equilibrium-attaining process in the anion exchange, where the diffusion of counter ions within the lake particle was ratedetermining. In both of the second and third cases, plotting of 1/ [D]s vs. 1/Wp gave straight lines, which suggested that the ion exchange equilibrium was attained.
These results were discussed in reference to those obtained previously with Tartrazine lakes, and the same dye elution mechanism as proposed for them was also found valid for Sunset Yellow FCF lakes.View full abstractDownload PDF (872K) -
Fusayoshi MASUDA1986 Volume 59 Issue 4 Pages 221-226
Published: April 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1004K) -
Seiji KATAYMA1986 Volume 59 Issue 4 Pages 227-233
Published: April 20, 1986
Released on J-STAGE: November 20, 2012
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Yoshiaki OYABU1986 Volume 59 Issue 4 Pages 234-238
Published: April 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (855K)
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