A Dispenser for Corrosive Liquids SAVER10 ZUFFANTI Northasstem University. Boston, Marumchusetts
THE DISPENSING of corrosive liquids, such as bromine, the phosphorus chlorides, and others, is a serious problem in laboratories where many portions must be measured out.
fender, as its vapors are very irritating, and the liquid causes very severe and slow-healing burns. The following apparatus seems to overcome all the objections cited. We have used this dispenser successfully with classes of 5&60 students and have had no accidents in two years. The aooaratus consists of a reservoir. D and a 'madu, ate, E, connected by glass tubing containing coimections and three glass stopcocks, A , B, and C. The capacities of D and E are 500 d. and 100 d.,respectively. These, of course, could be changed to meet the needs of the user. As the system functions under a slight vacuum, and the vapors are very corrosive, it is necessary to use a glass aspirator. The operation of the apparatus is simple and efficient. Stopcocks A and C are ordinarily kept open, and are closed only when the system is not to be used for some time. The graduated cylinder E is kept disconnected until bromine is to be drawn from the In the Organic Chemistry Laboratory of Northeast- reservoir D. With the aspirator functioning, and all stopcocks em University we have tried many methods and have found them undesirable largely, for two reasons: (1) open the graduate is put into place and then stopcock deteriorating action on rubber connections resulting in B is closed. When the desired volume of liquid has breaks, and (2) corrosive liquids freezing glass stop- been sucked into E, the stopcock B is opened, which cocks, or loosening of the stopcock on handling resulting stops the flow. With very little experience one can in the spilling of the liquid. Bromine is the worst of- judge when to open B to get the desired volume.
n.
A.
