Phenolic insecticides and fungicides . ber of analyses are tobe made, the work becomes burdensome. In order to facilitate thework, some new apparatus has been developed in the Insecticide Lab-oratory, a description of which may be of interest to those who have 4 Batemann, U. S. Dept. of Agr., Forest Service, Circular 112; also Circulars191 and 206. •r> Chapin, IT. S. Dept. of Agr., Bur. Animal Ind., Circular 167. 370 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION a number of analyses to make as a matter of routine. The new ap-paratus described is a steam distillation battery, a mechanical shak
Phenolic insecticides and fungicides . ber of analyses are tobe made, the work becomes burdensome. In order to facilitate thework, some new apparatus has been developed in the Insecticide Lab-oratory, a description of which may be of interest to those who have 4 Batemann, U. S. Dept. of Agr., Forest Service, Circular 112; also Circulars191 and 206. •r> Chapin, IT. S. Dept. of Agr., Bur. Animal Ind., Circular 167. 370 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION a number of analyses to make as a matter of routine. The new ap-paratus described is a steam distillation battery, a mechanical shaker,and a small device for holding flasks in the water bath. Illustrationsare given, however, showing each step in Chapins method for thedetermination of total phenols. In order to conduct the analyses without delays several sampleswere carried through at one time, the various processes being usuallyconducted in sets of either three or six, depending upon the time con-sumed and the nature of the process. The number of samples treated. Fiji. 1.—Steam Distillation Battery simultaneously in the different operations may be ascertained byreference to the cuts showing the different steps. The Steam Distillation BatteryChapins method involves the distillation of the acidified samplein a current of steam until the distillate amounts to at least 800 operation usually requires considerably more than an hourstime. The apparatus shown in figure 1 has been arranged and foundto be of great assistance in the determination of the phenols by thismethod. Incidentally it is also used whenever a process calls for PHENOLIC INSECTICIDES AND FUNGICIDES 371 steam distillation, being especially useful in the determination ofnicotine. The fixed support for the condensers and distillation flasks wassuggested in an article by The idea adapted to the needsof this laboratory is as follows: The support is fastened to the benchby means of foot plates and screws. To increase its rigidity,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsecticides, bookyea
