GB/T 13025.2-2008General test method in salt industry - Determination of whiteness (English PDF)
制盐工业通用试验方法 白度的测定
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Level / Type
National · Recommended
Issue date
December 31, 2008
Implementation date
May 1, 2009
Scope
GB/T 13025.2-2008 is the English-translated version of 制盐工业通用试验方法 白度的测定.
GB/T 13025.2-2008 is the second part of the Chinese national series of general test methods for the salt industry, and it gives the method for determining the whiteness of edible salt and of industrial salt.
It defines whiteness as the quantity characterising how white the colour of an object is, with a larger value meaning a greater degree of whiteness and the perfect reflecting diffuser taken as 100, and it goes on to a second term for blue-light brightness.
Its contents list covers the terms and definitions, the instruments and equipment, the test procedure and the presentation of results. The two documents it refers to are GB/T 9086 for the white standard plate used in colorimetry and photometry and JJG 512 for verifying the whiteness meter.
It replaces GB/T 13025.2-1991, was issued on 31 December 2008 and has applied since 1 May 2009.
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Document preview — GB/T 13025.2-2008
National Standard of the People's Republic of China
- ICS
- 67.220.20
- Classification
- X35
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 Terms and definitions5
- 4 Instruments and equipment6
- 5 Test procedure8
- 6 Results presentation9
Foreword
GB/T 13025 "General test method in salt industry" is divided into 13 parts.
- GB/T 13025.1 General test method in salt industry - Determination of grain size - GB/T 13025.2 General test method in salt industry - Determination of whiteness - GB/T 13025.3 General test method in salt industry - Determination of moisture - GB/T 13025.4 General test method in salt industry Test method for salt industry - Determination of insoluble matter - GB/T 13025.5 General test method in salt industry - Determination of chloride ion - GB/T 13025.6 General test method in salt industry - Determination of calcium and magnesium ion - GB/T 13025.7 General test method in salt industry - Determination of iodine - GB/T 13025.8 General test method in salt industry - Determination of sulfate ion - GB/T 13025.9 General test method in salt industry - Determination of lead ion (photometric method)
- GB/T 13025.10 General test method in salt industry - Determination of potassium ferrocyanide - GB/T 13025.11 General test method in salt industry - Determination of fluoride ion - GB/T 13025.12 General test method in salt industry - Determination of barium ion - GB/T 13025.13 General test method in salt industry - Determination of arsenic ion
This part is part 2 of GB/T 13025.
1 Scope
This part of GB/T 13025 specifies the method for the determination of the whiteness of edible salt and industrial salt in the salt industry.
This part is applicable to the determination of the whiteness of edible salt and industrial salt in salt industry.
2 Normative references
The provisions in following documents become the provisions of this part through reference in this part of GB/T 13025. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 9086 The white standard plate for colorimetry and photometry
JJG 512 Verification regulation of the whiteness meter
3 Terms and definitions
The following terms and definitions apply to this part of GB/T 13024.
3.1 Whiteness
It refers to the whiteness degree that characterizes the color of an object.
The greater the whiteness value, the greater the degree of whiteness. The whiteness value of perfect reflecting diffuser (PRD) is 100. […]
3.2 Blu-ray brightness
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 13025.2
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 13025.2-2008 | General test method in salt industry - Determination of whiteness | current edition | Current |
| GB/T 13025.2-1991 | General test method in salt industry-Determination of whiteness | previous edition | Superseded |
This page sells the current edition, GB/T 13025.2-2008. Earlier editions are listed for reference only.
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Related Standards
GB/T 9086-2007 — The white standard plate for colorimetry and photometry
GB/T 9086-2026 — White standard plates for colorimetry and photometry
JJG 512-2002 — Verification Regulation of the Whiteness Meter
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GB/T 13025.2-2008
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