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Oxidation of Arsenites to Arsenates in Cattle-Dipping Tanks

Published online by Cambridge University Press:  27 March 2009

W. F. Cooper  and
G. A. Freak
W. F. Cooper
Affiliation:
From the Cooper Laboratory for Economic Research.
G. A. Freak
Affiliation:
From the Cooper Laboratory for Economic Research.
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Extract

The gradual loss of efficiency of certain alkaline arsenite dipping baths has been traced by Brünnich to the oxidation of the arsenite to arsenate (Australian Association for the Advancement of Science, 1909). In this latter form, arsenic is not nearly so efficacious for the eradication of ticks, as in the reduced condition.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 4 , Issue 2 , October 1911 , pp. 177 - 181
Copyright
Copyright © Cambridge University Press 1911

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References

page 178 note 1 Since the completion of this work, Brünnich and Smith have published a communication on the estimation of arsenates in the presence of arsenites by means of magnesia mixture (Ztsch. f. Anorg. Chemie, Vol. 68, p. 292). In this, it is shown that the method is only reliable when the concentration of arsenite, ammonia, etc. lies between certain limits. Methods for the estimation of arsenates in the presence of arsenites as usually given in text books are unreliable. This became obvious to us in the course of our work, and researches were undertaken to devise a suitable method. The procedure adopted above seemed to us to be the best at the time; and, as only comparative, and not absolute, results are necessary the general conclusions are not vitiated. See also Lütz and Swinne, Ztsch. f. Anorg. Chemie, Vol. 64, p. 298.

page 180 note 1 Queensland Ann. Rept., Dept. Agric. 1907–8, p. 71.

page 180 note 2 Natal Agric. Journ., Vol. 11, p. 1576; Vol. 12, p. 436. Reprinted as Bull. 17.Google Scholar

page 181 note 1 For the information of those persons who may be interested in comparing the content of arsenic oxide in a bath, it may be observed that the “Government Sodium Arsenite” prior to Watkins Pitchford's paper, contained 68% As2O3. Since the date of this paper, however, an arsenite is used containing 80% As2O3. As a matter of fact, a great objection to the use of “Government Sodium Arsenite” used to be its inconstant composition (Dixon, R. W., Agric. Journ. of Union of South Africa, Vol. II. p. 15).