PPM 是溶液浓度一种表示方法,配制农药时常需用到。但是,计算方法复杂,手续麻烦,不易掌握。为简便计算手续,这里介绍一种简便计算方法,供参考。计算公式:一份农药加水的份数=(农药的百分比数×1,000,000)+欲配制的PPM数。举例:假如要把1两40%乙稀利稀释成1000PPM 溶液,需加水多少?解:加水数=((40)/(100)×1,000,000)+1000=400(两)。这也就是说,要把1两含量40%的乙稀 PPM is a solution concentration solution, often used in the preparation of pesticides. However, the calculation method is complex, the procedure is troublesome, and it is not easy to grasp. For easy calculation procedures, here is a simple calculation method for reference. Formula: The number of pesticides plus water = (pesticide percentage × 1,000,000) + PPM to be prepared. Example: Suppose you want to dilute 1 to 40% of the diluted solution to 1000PPM, how much water should be added? Solution: add water = ((40) / (100) × 1,000,000) + 1000 = 400 (two). That is to say, to take a two content 40% of the ethylene