The paper describes a gravimetric method of determining the volatility (evaporation rate) of pesticides. The measuring apparatus may be set at any temperature between ∼15 and 80°C; the dry air flowing through the apparatus is regulated by valves between ‐0.2 1/h and 300 1/h.
Figures available for vapour pressure reveal a mathematical relation between vapour pressure and evaporation rate. This can be used as a simple method of determining the vapour pressure of any substance at 20°C by determining the evaporation rate when the air current is flowing at 50 l/h. The effects of the temperature and the air flow rate on the evaporation rate are also analysed.
The influence of Si and P contents in steels on the galvanizing behavior W. Katzung und R. RittigEs wurdc das Verzinkuiigsverhaltcn von 40 aktuellen Baustahlen in Abhiingigkeit win komplexen EintluB des Si-/P-Gehaltes bei den in der Feuerver7.inkungsindiistrie ublichen Bedingungen (440/450/460 C, 5/10/ 15 min Tauchdauer) untersucht. Eine spurbare Wirkung von P auf das Schichtdickenwachstum voii Stiihlen init 0,O I his 0.40 '2 Si beginnt bei > 0,020 %, P. Der Einflul3 von P ist um so griiRerje kleiner der Si-Gehalt der Stiihle und je niedriger die Tempel-atur der Schmelze ist. Bei Stiihlen init <0.12% Si verschiebt ein erhiihter P-Gehalt die Schichtdickeninaxiina in dem Temperaturbereich von 440 bis 450'C, wie das sonst fur Stahle >0.12% biz 0.28% Si init < 0.020% P typisch ist. Zinkuberzuge von Stiihlrn mit kritischem P-/Si-Gehalt (0 his 0,20% Si/ > 0,020% 0933-5137/9711212-0S75$17.50 + ,5010 575
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