薬品入り氷の砕氷の融解過程に於ける融水中の薬品濃度の推移 : クロルテトライサクリン入り氷に就いて

概要

論文の詳細を見る
The form of application of chemical preservatives as carried by ice is conceived to betray in process of thaw a serious fault in availability owing to their heterogeneous distribution, in a strict senese of the word, in a block of ice, even if a precaution has been taken to maintain uniform distribution of the preservatives. To verify the said conception, a brief experiment was undertaken, using a chlorine free ice loaded with C. T. C. hydrochloride and sometimes with carboxy methyl cellulose (C. M. C.) in addition, under the conditions which were adjusted as closely as possible to those prevailing in an ice-room on board. Concentration drift of C. T. C. was followed-up by submitting the differential melts to bioassay, which came separating from the ice in succession. Despite of the bulk uniformity of C. T. C. distribution found for a lot of crushed ice (cf. Table 1), C. T. C. concentration in the differential melts obtained in early stage of thaw proved to be higher than the initial bulk concetration in support of the authors view that a portion of ice locally heavily loaded with C. T. C. is to make the first drainage that departs from the ice. The C. T. C. concentration in successive melts went decreasing by degrees, attaining already to the half of initial bulk concentration when the ice melted by some 40% and finally to about one third in the present conditions of experiment. Additional loading of ice with C. M. C. as protective colloid for securing a fine dispersion of C. T. C. hydrochloride proved to be of little effect on the above tendency of concentration drift, again in favor of the view that the rapid loss of C. T. C. might results from heterogeneous distribution of C. T. C. in the block of ice, for unlike eutectic mixture or solid solution, even the suspension-like distribution of C. T. C. does not make homogeneous composition of ice. In order to summarize the experimental data, a tentative formula was worked out as follows, which allowed the preservative availability of an ice loaded with C. T. C. to be appraised throughout the cource of thaw: C=b+a/x<6.8×103 wherein C stands for the concentration of C. T. C. hydrochlorid (ppm) in the differential drainage from thaw at the moment when the thaw has grown up to x percent of initial weight of the ice, a and b being parameters. (In the present experiment, for instance, a=27.0 and b=1.20 for an ice originally loaded with both C. T. C. and C. M. C. by 5 ppm and 15.2 ppm, respectively.). The so-called C. T. C. ice, may it appear as a happy idea and handy for preservative use, is not actually free from the demerit of being apt to be seriously reduced in availability when the ice is obliged to be reserved long aboard for coming into application on a far distant fishing ground.
公益社団法人日本水産学会の論文

薬品入り氷の砕氷の融解過程に於ける融水中の薬品濃度の推移 : クロルテトライサクリン入り氷に就いて

スポンサーリンク

概要

著者

関連論文

スポンサーリンク