The Detection of Traces of Copper.

Abstract

r68 iv. 13. PRITZ. \. (; T I I , I , .~U D E~. ; z w 1 R WITHROW. when low humidity usually prevails indoors, and a t such times the difference in temperature between the water and the surrounding atmosphere may amount to 4' or more. It takes some time for the sample to attain the temperature of the water, if i t is drawn directly into the buret, and if accurate results are to be obtained with the original Pettersson-Palmqvist apparatus or with any of the forms mentioned under group 11, the manipulation cannot be continued until this condition has been satisfied. In many cases the movement o f the manometer liquid resulting from the change of volume due to thk cause alone is greater than would result from the removal of the carbon dioxide that the sample contains. The necessity for delay iq completely obviated when the sample is drawn through the copper coil. The apparatuc; is manufactured by Greiner and Friedrichs, Stutzerbach in Thuringen, Germany.