REPOET OF ANALYSES OF PARIS GREEN AND 

 OTHER INSECTICIDES IN 1900J't 



L. L. VanSlyke and W. H. Andrews. 



SUMMARY. 



In accordance with tlie provisions of a law designed to protect 

 purchasers of Paris green, samples were secured during 1900 and 

 the results are published in this bulletin. 



Paris green contains as its chief constituent a compound called 

 copper aceto-arsenite, which, when chemically pure contains: 



Arsenious oxide 58.64 per ct. 



Copper oxide, 31.30 " 



Acetic acid, 10.06 « 



In the 22 samples of Paris green examined, the arsenious oxide 

 varied from 55.83 to 60.80 per ct. and averaged 57.05 per ct. The 

 water-soluble arsenious oxide varied from 0.61 to 15.69 per ct. 

 and averaged 1.68 per ct. 



The copper oxide varied from 27.22 to 31.20 per ct. and 

 averaged 30.02 per ct. The amount of arsenious oxide for each 

 pound of copper oxide varied from 1.81 to 2.24 and averaged 1.89 

 pounds. The impurity most commonly found was white arsenic 

 and this did not appear to be excessive. The general result of 

 the examination is to show a good quality of Paris green in the 

 market at the time the samples were taken. 



♦Printeci by the authority and under the direction of the Commissioner 

 of Agriculture. 

 t Reprint of Bulletin No. 190. 



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