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Determination of fluoride in water. A modified zirconium-alizarin method
W.L. Lamar
1945, Industrial and Engineering Chemistry (17) 148-149
A convenient, rapid colorimetric procedure using the zirconium-alizarin indicator acidified with sulfuric acid for the determination of fluoride in water is described. Since this acid indicator is stable indefinitely, it is more useful than other zirconium-alizarin reagents previously reported. The use of sulfuric acid alone in acidifying the zirconium-alizarin reagent...
The relation of selenium to western duck sickness
H. W. Lakin, E. R. Quortrup, N. Hotchkiss
1944, The Auk (61) 415-420
In 1936 Twomey and Twomey reported that 20-50 parts per million of selenium as sodium selenite in the drinking water produced poisoning in ducks in which the syndrome was identical with that produced by Clostridium botulinum type C, which had been considered the principal causative agent in western duck...