GB/T 24990-2010Paper,board and pulps - Determination of chromium (English PDF)
纸、纸板和纸浆 铬含量的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 9, 2010
Implementation date
December 1, 2010
Scope
GB/T 24990-2010 is the English-translated version of 纸、纸板和纸浆 铬含量的测定.
GB/T 24990-2010 is the Chinese standard "Paper,board and pulps - Determination of chromium". Its scope clause reads: This standard specifies the method for the determination of chromium content in paper, paperboard and pulp trace.
This standard applies to all kinds of digestion can be used dry or wet digestion with nitric acid test sample of paper, paperboard and pulp chromium content.
The detection limit of the method depends upon the instrument by flame atomic absorption spectrometry method, typically about 10mg/kg, with the graphite furnace atomic Absorption, usually about 50µg/kg. Its clauses include reagents.
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Document preview — GB/T 24990-2010
National Standard of the People's Republic of China
- ICS
- 85.010
- Classification
- Y 30
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3.1 Dry Digestion
- 3.2 airtight wet digestion
- 3.3 atmospheric wet digestion
- 4 Reagents
1 Scope
This standard specifies the method for the determination of chromium content in paper, paperboard and pulp trace.
This standard applies to all kinds of digestion can be used dry or wet digestion with nitric acid test sample of paper, paperboard and pulp chromium content.
The detection limit of the method depends upon the instrument by flame atomic absorption spectrometry method, typically about 10mg/kg, with the graphite furnace atomic
Absorption, usually about 50µg/kg.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 450 and take samples to an aspect of paper and paperboard samples, positive and negative determination (GB/T 450-2002, ISO 186.
1994, MOD)
GB/T 462 paper, board and pulp - Determination of water sample (GB/T 462-2008; ISO 287. 1985, MOD;
ISO 638. 1978, MOD)
GB/T 740 pulp samples taken (GB/T 740-2003, ISO 7213. 1981, IDT)
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, NEQ)
Principle 3
3.1 Dry Digestion
After the high temperature burning ash sample, dissolved in nitric acid, using the standard curve by flame atomic absorption determination of chromium.
Note. Due to high temperature burning nitric acid-insoluble inorganic substances such as kaolin or china clay, will produce a sample of chromium adsorption, so this method is only applicable to a flame method
Determination of chromium content in the pulp and inorganic filler kaolin or uncoated paper and paperboard less. Spike recovery test can be carried out simultaneously in the testing process
To determine the applicability of the method.
3.2 airtight wet digestion
In a closed vessel, the sample digestion with nitric acid at high temperature and pressure conditions, the sample was diluted to obtain, according to the test limit requirement, the election
Optional standard curve by flame atomic absorption or standard addition method by graphite furnace atomic absorption determination of chromium.
3.3 atmospheric wet digestion
With concentrated sulfuric acid charring the sample was added nitric acid digestion heating to obtain clarification of the sample, based on the inspection of limited requirements, selection criteria song
Line by flame atomic absorption or standard addition method by graphite furnace atomic absorption determination of chromium.
Note. Due to a mixed acid-insoluble heating kaolin or china clay and other minerals, will produce a sample of chromium adsorption, so this method is only applicable to pulp can be measured in
Trial process while spike recovery tests to determine the suitability of the method.
4 Reagents
Unless otherwise indicated, used in the analysis confirmed only for the gifted class pure reagents.
4.1
water, in line with GB/T 6682 secondary water.
4.2
Concentrated nitric acid (HNO3), 1.40g/mL, the mass fraction is 65% to 68%.
4.3
sulfate (H2SO4), 1.83g/mL, mass fraction of about 95% to 98%.
4.4
Hydrogen peroxide (H2O2), 1.11g/mL, the mass fraction of 30% or greater.
GB/T 24328.3-2020 | GB/T 27741-2018 | GB/T 31905-2015 | GB/T 24988-2020 | GB/T 24999-2018 | GB/T 24991-2010 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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