GB/T 16150-2025 Determination method of sieve analysis for pesticides English, Anglais, Englisch, Inglés, えいご
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ICS 13.340.01
CCS H 57
National Standard of the People's Republic of China
GB/T 16150-2025
Replaces GB/T 16150-1995
Determination method of sieve analysis for pesticides
Issue date: 2025-08-29 Implementation date: 2026-03-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Test Methods
5 Test Samples
6 Test Conditions
7 Test Procedure
References
Determination method of sieve analysis for pesticides
Warning: Personnel using this document shall have practical laboratory experience. This document does not address all safety issues. Users are responsible for implementing appropriate safety and health measures.
1 Scope
This document describes the sieve analysis test methods for pesticides.
Wet sieving test: applicable to the determination of passing rate for dispersible tablets, soluble tablets, wettable powders, emulifiable powders, granule suspensions, water-dispersible granules, dispersible liquid concentrates, oil-based suspensions, microcapsule suspensions, microcapsule suspension-emulsions, microcapsule suspension-suspensions, microcapsule suspension-emulsion-suspensions, suspension concentrates, seed treatment wettable powders, and seed treatment suspension concentrates.
Dry sieving test: applicable to the determination of passing rate for powder formulations and seed treatment dry powders.
Particle size range: applicable to the determination of particle size in granular formulations.
2 Normative References
This document contains no normative references.
3 Terms and Definitions
No terms or definitions are defined in this document.
4 Test Methods
4.1 Wet Sieving Test
4.1.1 Principle
Weigh the sample, wet it in a beaker, and stir. Transfer the wetted sample to a test sieve, rinse with a gentle stream of tap water, and collect the residue on a watch glass. Dry the residue, weigh it, and calculate the passing rate.
4.1.2 Apparatus and Materials
Test sieve: 20 cm diameter, 75 μm aperture.
Magnetic stirrer.
Magnetic stirrer bar: ~2 cm length.
Drying oven: temperature control ±2°C.
Balance: 0.01 g and 0.0001 g precision.
Beaker: 250 mL.
Rubber hose: 10 mm inner diameter.
Watch glass: 12 cm diameter.
Desiccator.
4.1.3 Procedure
4.1.3.1 General Conditions
Conduct all operations at ambient temperature (25°C ±5°C).
4.1.3.2 Sample Wetting
Weigh 10 g (0.01 g precision) of sample into a 250 mL beaker. Add 100 mL tap water, let stand for 60 s, then stir for 5 min using a magnetic stirrer.
4.1.3.3 Wet Sieving
Transfer the wetted sample to the test sieve and rinse with tap water. Use a gentle stream of tap water (1–5 L/min, 2–5 cm above the sieve surface) to rinse the residue for up to 10 min until no further residue is visible. If no residue remains, record a passing rate of 100%. If residue is present, transfer it to a pre-weighed watch glass using deionized water. Dry at 70°C (or an appropriate temperature based on product properties) until constant weight.
Cool in a desiccator, weigh (0.0001 g precision), and calculate the passing rate using formula (1):
where:
w1w1: Passing rate of wet sieving test (%);
m1m1: Mass of sample (g);
m2m2: Mass of residue (g).
4.1.3.4 Permissible Difference
The difference between duplicate results shall not exceed 0.5%. Report the arithmetic mean as the final result.
4.2 Dry Sieving Test
4.2.1 Principle
Weigh a sample, sieve it through a test sieve until the residue mass stabilizes, and calculate the passing rate based on the mass passing through.
4.2.2 Apparatus and Materials
Test sieve: 20 cm diameter, 75 μm aperture (or other sizes), with a receiving pan and lid.
Vibratory sieve shaker (for shaker method): tray diameter ≥20 cm, amplitude 4 mm, frequency 300 rpm.
Balance: 0.01 g precision.
Soft brush: 2.5 cm flat brush.
Stiff brush.
Iron stand (for manual sieving).
Metal rod (for manual sieving): 1 cm diameter, 10 cm length.
Rubber plate (for manual sieving): 20 cm × 20 cm, hardness 35–40 IRHD (or equivalent).
4.2.3 Procedure
4.2.3.1 Shaker Method (Arbitration Method)
Install the test sieve on the shaker. Weigh 20 g (0.01 g precision) of sample into the sieve. Vibrate for 5 min, allow dust to settle for 2 min, then weigh the material in the receiving pan (m3m3).
4.2.3.2 Manual Sieving Method
