EFFECT OF PH ON MOLLUSCICIDAL ACTIVITY OF BAYER 73 VS. AUSTRALORBIS GLABRATUS OF PUERTO RICO UNDER LABORATORY CONDITIONS

A Laboratory strain of Australorbis glabratus of Puerto Rico when exposed for 24 hours in Bayer 73, 5-chlorosalicylic acid (2-chloro, 4-nitro) anilide, at 0.2 parts per million in aerated tap water (pH 7.0-8.2) invariably succumbs, 100% of the snails being killed. However, in test waters of high acidity (pH 4 and pH 5) and high alkalinity (pH 9.3-9.9) 4 to 8 times as much molluscicide or 0.8 to 1.6 ppm may be necessary to effect 100% mortality. Different kinds of water such as distilled, chlorinated tap, aerated tap, and the like, give markedly different mortality results in toxicological experiments in various laboratories throughout the world. This may be partly explained by the different qualities of the water, of which an important one is the pH. (Author) Pub. in Experimental Parasitology (U. S.) v13 n2 p16772 Apr 1963 (Copies not available to DDC or Clearinghouse customers). Research supported in part by the World Health Organization and the Puerto Rico Department of Public Health.