Super detailed pesticide dilution algorithm summary

Second, the multiple concentration: refers to a pesticide multiple of water, commonly used to represent. For example, the preparation of 700 times 50% carbendazim is done with 1 part of 50% carbendazim and 700 parts water.

Third, the conversion method: conversion formula converted from percentage concentration to ppm concentration is: 1 part of the pesticide plus the number of water = the percentage of pesticides 1000000 / to be prepared in the number of ppm. For example, the ethylene content of 40% is equated with 1 kg of a 2000 ppm solution, and the amount of water added to ethylene ethoxide is 40% of 1000000/2000=200 parts.

Fourth, converted into multiple concentration: the percentage divided by the number of ppm, the decimal point is shifted back by 4, that is, the dilution ratio. For example: 40% ethephon 1000ppm, when converted to multiple concentration, with 401000 = 0.04, 4 decimal places backward shift. That is 400 times.

Fifth, watering method: When mixed with several pesticides, not every drug plus one water, but a variety of drugs are calculated with the same amount of water to calculate the concentration. For example: 500 times the urea plus 1000 times the thiophanate methyl, is 2 parts of urea plus 1 part thiophanate methyl water plus 1000 parts. In addition, when the water, it should be dubbed mother liquor, that is, a small amount of warm water to the liquid liquefaction, and then add water to the required concentration, fully dissolved in order to improve efficacy, to prevent injury.

How to properly dilute pesticides?

In the use of pesticide products, the mastery and configuration of the concentration of pesticides, the actual effect and role of this pesticide spraying, dilution of pesticides has become a key part of the use of pesticides, then how to properly dilute the pesticide?

(a) Representation of agent concentration

1. Percent concentration: refers to the number of active ingredients in 100 pesticides, often expressed as (%).

2. Parts per million: Refers to the number of active ingredients in 1 million pesticides. Symbols are PPm (or micrograms per milliliter; milligrams per liter; grams per cubic meter, etc.).

3. Multiplier method (ie, dilution factor): refers to the multiple of water or other diluents (fine earth, granules, etc.) added when commercial pesticides are diluted. Dilutions 100 times or 100 times. Calculate 1 part of the original dose. If diluted by 50 times, use 1 part of the original drug plus 49 parts of thinner. Diluted more than 10 times, the calculation does not deduct the number of parts of the original agent, such as 600 times the dilution, that is, with 1 part of the original drug plus 600 thinner.

(II) Conversion between concentration expressions

1. Conversion between percent concentration and millionth concentration

Parts per million (ppm) = 10,000 percent concentration

2. Conversion between multiple method and percent concentration

Percent concentration (%) = (concentration of drug/diluted multiple) x l00

(III) Calculation Method for Diluting Pesticides

1. Calculated by active ingredients:

(1) Find the amount of thinner (water or filler, etc.)

1 diluted 100 times or less:

Diluent dosage = weight of original drug x (concentration of original drug - concentration of formulated drug) / concentration of formulated drug

2 diluted more than 100 times:

The amount of diluent = the original agent weight x the original agent concentration / the concentration of the agent

(2) Finding the dosage

The amount of the original agent = the weight of the formulated agent x the concentration of the agent formulated / the concentration of the original agent

2. Calculated by a multiple method (regardless of active ingredient content):

(1) diluted 100 times or less

The amount of diluent = the original agent weight dilution - the original drug weight

(2) diluted 100 times or more

Diluent dosage = original reagent weight dilution multiple

(3) Finding the dosage

The amount of the original drug = the weight of the drug with the dilution / dilution ratio

(4) Dilution times

1 Dilution multiples from the concentration ratio:

Dilution factor = original drug concentration / concentration

2 Dilution by weight ratio:

Dilution factor = the weight of the formulated medicament/the weight of the original medicament

Concentration and Concentration Unit Conversion Concentration Formula Conversion

Concentration and concentration unit conversion

Solution concentration

Solution concentration can be divided into mass concentration (such as mass percentage concentration) and volume concentration (such as molar concentration, normal concentration) and volume concentration.

1, the percentage of mass concentration

The solution concentration is expressed as a percent mass concentration expressed as a percentage of the mass of the total solution, expressed as a percent symbol. For example, 25% glucose injection means that 25 grams of glucose is contained in 100 injections.

Percent Mass Concentration (%) = Solute Mass / Solution Quality 100%

2, volume concentration

(1) Molar concentration

The concentration of the solution is expressed in terms of the number of moles of solute contained in one liter of solution, expressed as the symbol mol, for example 18.1 in 1 liter of concentrated sulfuric acid.

Molar sulfuric acid has a concentration of 18.4 mol.

Molarity (mol) = moles of solute / volume of solution (l)

(2), normal concentration (N)

The concentration of the solution is expressed as the equivalent concentration expressed as the number of equivalents of solute contained in 1 liter of solution, which is denoted by the symbol N.

For example, 1 liter of concentrated hydrochloric acid contains 12.0 gram equivalent of hydrochloric acid (HCl), and the concentration is 12.0N.

Equivalent concentration = gram equivalent of solute / volume of solution (litre)

3, mass-volume concentration

The concentration expressed by the mass of the solute contained in a unit volume (1 cubic meter or 1 liter) solution is called mass-volume concentration, and is expressed by the symbol g/m3 or mg/L. For example, if 1 liter of chromium-containing wastewater contains 2 mg of hexavalent chromium, then the concentration of hexavalent chromium is 2 mg/L (mg/L).

Mass-volume concentration = mass of solute (grams or milligrams) / volume of solution (cubic meters or liters)

4, the conversion formula of the concentration unit:

1), normal concentration = 1000.d. mass percent concentration / E

2), mass percentage concentration = normal concentration E/1000.d

3) Molar concentration = 1000.d mass percentage concentration / M

4), mass percent concentration = mass-volume concentration (mg/l) / 104.d

5) Mass-volume concentration (mg/L) = 104 mass percent concentration

5, ppm is the percentage of weight, ppm = mg/kg = mg/L

That is: 1ppm=1ppm=1000ug/L

1ppb=1ug/L=0.001mg

Where: E-solute gram equivalent;

D—the specific gravity of the solution;

M-solute molar mass;

1PPM is equal to how much, how to convert? Second, PPM is a commonly used concentration unit in the world, because PPM is the English abbreviation, not the name of the unit of calculation, that is, 1PPM = 1x10-6 that 1PPM concentration is one millionth.

How to convert PPM concentration:

1G 100% concentration of the drug diluted 1000KG water is 1PPM concentration, if the drug concentration of the active ingredient is 50%, then 1G50% concentration of drug diluted 500KG water is 1PPM concentration

For example: How many times do you need to dilute the water for 500PPM GA3 (content is 100%)?

100/500X10000=2000 times

That is, 1G diluted 2000G water to 500PPM concentration;

The following conversion formula can be used:

Pesticide active ingredient content (%) / liquid effective to become the concentration (PPM) X10000 = water dilution multiple.

The above is the PPM conversion method, if you want to use the above formula to convert

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