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Oily Grime Formed on Hard Surfaces of Kitchen Appliances: (Part 2) Kinetics of Oily Grime Removal
Author(s) -
Yamada Kaoru,
Tsutsui Takuya,
Natsuhara Masahiko,
Tanizawa Yoshiaki
Publication year - 2007
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-007-1025-7
Subject(s) - chemistry , absorbance , chromatography , reaction rate constant , alkalinity , adsorption , kinetics , organic chemistry , chemical engineering , physics , quantum mechanics , engineering
Abstract The oily grime adsorbed to the surfaces of kitchen appliances ages to become difficult to remove using normal dishwashing detergents. Artificial grime models similar to actual grime were prepared using composition data of the oily grime obtained in previous work. To evaluate typical cleaning products, one needs to observe their efficacy against actual and artificial grime using precise and objective evaluation methods. In the present work, the kinetic method was applied to actual kitchen grime. The grime‐removal rate constants were calculated by monitoring absorbance of the cleaning fluids, and the results are discussed based on the compositions of the detergents and grime. One commercial detergent, with pH adjusted to 9.7, consisted mainly of spirit solvent and had two rate constants, k 1 (fast) and k 2 (slow), which indicated the removal rates of THF‐soluble and THF‐insoluble oily grime, respectively. With a second commercial detergent that contained mainly an alkali agent at pH 11.8, the removal rates were extremely fast for both THF‐soluble and THF‐insoluble grime. The alkalinity worked effectively against both types of grime. The effects on the removal rates of various ingredients that could be added to the cleaning products were also investigated and the overall removal rates were highly dependent on the pH of the fluids and slightly dependent on the kinds of alkalies used. The present kinetic method was found to be useful for evaluating the capability of the detergents. The plural rate constants observed for a single grime sample, which previously were not well understood, could be interpreted in terms of the compositions of the grime.