The authors describe some experiments carried out to determine the effect of moisture, temperature, and pressure on the suspensibility of DDT water-dispersible powders.It was found that the removal of moisture brought about a slight increase in suspensibility; that heating for one hour at temperatures below 70°C resulted in an increase in suspensibility, due probably to the drying effect of the heat, whereas heating for the same period at temperatures above 70°C resulted in a decrease; that on prolonged heating at 70°C and 75°C the suspensibility decreased sharply in the first four hours but thereafter showed little change up to 20 hours; and, finally, that low pressures—for example, 25 g per cm2—had little effect on the suspensibility, but that at pressures of 100 pounds per square inch (7 atm.) and over, it varied in inverse proportion to the logarithm of the pressure.
展开▼
机译：作者描述了一些试验，以确定水分，温度和压力对DDT水分散性粉末悬浮性的影响。发现，除去水分会使悬浮性略有增加；在低于70°C的温度下加热一小时会导致悬浮性增加，这可能是由于热量的干燥作用所致；而在同一时间在高于70°C的温度下加热则会导致悬浮性降低；在70°C和75°C下长时间加热后，悬浮性在前四个小时急剧下降，但此后直到20小时几乎没有变化；最后，低压（例如25 g / cm 2 ）对悬浮性几乎没有影响，但在100磅/平方英寸（7个大气压）及更高的压力下，与压力的对数成反比。
展开▼
