What are the methods for expressing pesticide concentrations?
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Most pesticide preparations must be formulated into a certain concentration of liquid before use. The concentration usually includes both effective concentration and dilution concentration. The former refers to the active ingredient dilution of the pesticide, expressed in terms of percentage concentration and parts per million; the latter refers to the dilution of the pesticide preparation, expressed in multiples.
1. Percent concentration: refers to the fraction of active ingredients contained in 100 parts of the liquid. It has a concentration by weight and a percentage by volume. The weight percent concentration is usually used when dispensing between the body or between the solid and the liquid; the percentage of the volume used in the dispensing between the liquids.
2. Million parts concentration; commonly used PPM, is a trace pesticide concentration representation, refers to the number of parts of the active ingredient contained in one million parts of the liquid.
3. Method fold: that is, how many times the original drug are diluted notation fair share ratio between the two outer and method ratio method. The internal ratio method means that when the medicine is diluted 100 times, the calculation is performed, and 1 part of the original medicine is deducted. If the dilution is 80 times, the calculation does not deduct a portion of the original medicine, for example, 1000 times dilution, that is, Add 1000 parts of the diluent with one part of the original agent.
What are the methods for expressing pesticide concentrations?