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SN/T 4844-2017: Particle size analysis of liquid pesticide formulation. Laser diffraction method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| SN/T 4844-2017 | English | 209 |
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Particle size analysis of liquid pesticide formulation. Laser diffraction method
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SN/T 4844-2017
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Basic data | Standard ID | SN/T 4844-2017 (SN/T4844-2017) | | Description (Translated English) | Particle size analysis of liquid pesticide formulation. Laser diffraction method | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | G25 | | Word Count Estimation | 9,941 | | Date of Issue | 2017-07-21 | | Date of Implementation | 2018-03-01 | | Regulation (derived from) | State-Quality-Inspection-Accreditation (2017) 337 | | Issuing agency(ies) | General Administration of Customs | SN/T 4844-2017: Particle size analysis of liquid pesticide formulation. Laser diffraction method---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Determination of particle size of liquid pesticide formulations by laser diffraction method)
People's Republic of China entry and exit inspection and quarantine industry standards
Determination of particle size of liquid pesticide preparations
Laser diffraction
Released on.2017-07-21
2018-03-01 implementation
People's Republic
The General Administration of Quality Supervision, Inspection and Quarantine issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed and managed by the National Certification and Accreditation Administration.
This standard was drafted. Shanghai Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China.
The main drafters of this standard. Gu Zhongyi, Cheng Yuxiao, Qiang Yin, Zhang Lin, Zhang Wei, Jin Yinghua.
Determination of particle size of liquid pesticide preparations
Laser diffraction
1 Scope
This standard specifies the method for determining the particle size of liquid pesticide formulations by laser diffraction.
This standard is applicable to the particle size of liquid pesticide preparations with particle size distribution ranging from 0.1μm to 500μm, which is insoluble or poorly soluble in water.
Determination.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2. Determination of standard method of measurement
Basic method of sex and reproducibility
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 19077.1 Particle size analysis - Part 1 . General rules
3 terms, definitions and symbols
3.1 Terms and definitions
The following terms and definitions as defined in GB/T 19077.1 apply to this document.
3.1.1
Focusing on light
The optical system is calibrated, the lens is adjusted so that the detector is well centered and is located on the focal plane of the lens.
3.1.2
Shading obscuration
The amount of light energy diffracted in the beam due to the introduction of the sample, which represents the concentration of the sample in the disperser, can also be expressed by the shading ratio.
3.2 symbol
The following symbols, as defined in GB/T 19077.1, apply to this document.
X10 The particle diameter of 10% of the total volume is less than this value, μm; can also be expressed by d(0.1), d10, etc.;
The median diameter of x50 particles, μm; the particle diameter of 50% of the total volume is less than this value, and another 50% of the total volume
The diameter is larger than this value; it can also be expressed by d(0.5), d50, etc.;
X90 The particle diameter of 90% of the total volume is less than this value, μm; can also be expressed by d (0.9), d90, etc.;
D[3,2] surface area average particle size, μm;
D[4,3] Volume average particle size, μm.
4 Method summary
After the sample was dispersed in a wet disperser of a laser particle size analyzer by a dispersing agent, the particle size was measured by a detector in the optical element.
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