GB/T 31737-2015Testing method of pourability for pesticides (English PDF)

3.1 Method summary

A predetermined amount of the sample was placed in a standard cylinder in a fixed time, then in accordance with the requirements of a certain amount measured after pouring cylinder of residues and the use of

Volume measuring cylinder residue washed with water.

3.2 Reagents and solutions

Water. Distilled water, in line with GB/T 6682-2008 requirements.

3.3 Instrument

With standard ground stopper (B34) cylinder. cylinder height 39cm (bottom to plug the bottom of the inner cylinder), an inner diameter of 5cm, 80% of the total volume (Near the plug) has a tick.

Electronic balance. a sense of the amount of 0.1g, loading of 2kg.

Stopwatch.

3.4 Procedure

Determination of residue after dumping 3.4.1

He said measuring plug cylinder quality (accurate to 0.1g); the sample was added to the mark at 80% of the total volume of the cylinder, stoppered, and then weighed (fine

Indeed to 0.1g). At room temperature (the temperature can be specifically determined according to actual needs) was allowed to stand for 24h, the first cylinder upright position by the rotation of 135 °, inclination

Pour 60s, then invert 60s. Re-plug cylinder of said measuring quality (accurate to 0.1g). After the mass fraction indicates that the sample of the residual dumping

Was, according to equation (1).

w1 = m2-m0 m1-m0 ×

100% (1)

Where.

After w1 --- pouring the residue, expressed as a percentage;

m2 --- After pouring the residue with a total mass of the cylinder plug mass in grams (g);