GB/T 4702.16: Evolution and historical versions
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| GB/T 4702.16-2025 | English | RFQ |
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Chromium metal - Determination of sulfur content - Infrared absorption method and combustion-neutralization titration method
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GB/T 4702.16-2025
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| GB/T 4702.16-2008 | English | 229 |
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Chromium metal -- Determination of sulfur content -- Infrared absorption method and combustion-neutralization titration method
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GB/T 4702.16-2008
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| GB/T 4702.16-1988 | English | 199 |
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Methods for chemical analysis of chromium metal--The infrared absorption method for the determination of sulfur content
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GB/T 4702.16-1988
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Basic data | Standard ID | GB/T 4702.16-2025 (GB/T4702.16-2025) | | Description (Translated English) | Chromium metal - Determination of sulfur content - Infrared absorption method and combustion-neutralization titration method | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 4702.16-2008 | GB/T 4702.16-2008: Chromium metal -- Determination of sulfur content -- Infrared absorption method and combustion-neutralization titration 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.
Chromium metal. Determination of sulfur content. Infrared absorption method and combustion-neutralization titration method
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 4702.16 ~ 4702.17-1988
Determination of sulfur content of chromium
The infrared absorption method and combustion titration method
Posted 2008-05-13
2008-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This part is GB/T 4702.16-1988 "Determination of the amount of sulfur for chemical analysis of chromium metal - The infrared absorption method"
GB/T 4702.17-1988 "chromium chemical analysis of combustion and determination of sulfur content titration" integration amendment.
This Part replaces GB/T 4702.16-1988, GB/T 4702.17-1988.
This portion of the GB/T 4702.16-1988 and GB/T 4702.17-1988 comparison, the main changes are as follows.
--- Infrared absorption method in flux increased from 0.50g tin particles, 1.50g to 0.25g tungsten particles tin particles, 1.0g tungsten particles, and add
Into 0.50g of pure iron;
--- Combustion and titration measurement range from the original ≤0.070% to 0.005% to 0.070%.
This part is proposed by the China Iron and Steel Association.
This section is under the jurisdiction of Metallurgical Industry Information Standards Institute.
This section is drafted. Changshu CIQ.
The main drafters of this section. a new kingdom, Xu Yuyu, Hu Qing Yu Lu.
This part replaces the standards previously issued as follows.
--- GB/T 4702.16-1988;
--- GB/T 4702.17-1988.
Determination of sulfur content of chromium
The infrared absorption method and combustion titration method
Warning. Use of this section shall be a person experiences regular laboratory work. This section does not indicate that all possible security issues.
Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.
1 Scope
This section provides an infrared absorption method and combustion titration and determination of chromium in sulfur content.
This section applies to the determination of chromium in sulfur content. Wherein the measurement range infrared method (mass fraction). 0.005% and 0.045%; combustion
Neutralization titration range (mass fraction). 0.005% to 0.070%.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB/T 4010 alloy chemical analysis and preparation of samples for.
3 Method One. The infrared absorption method
3.1 Principle
The sample is heated in an induction furnace in an oxygen stream of combustion, the oxygen produced by the sulfur dioxide contained in the measuring chamber to the infrared analyzer dioxide
A sulfur absorbing specific wavelengths of infrared energy, which is proportional to the absorbed energy and the concentration of sulfur dioxide, according to the change in energy receiving detector may be measured
Sulfur content.
3.2 Reagents and materials
Unless otherwise indicated, the analysis uses only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.
3.2.1 magnesium perchlorate, anhydrous, granular.
3.2.2 asbestos caustic soda, granular.
3.2.3 glass wool.
3.2.4 tungsten particles, sulfur content is less than 0.0002%, particle size 0.8mm ~ 1.4mm.
3.2.5 tin particles, sulfur content is less than 0.0003%, particle size 0.4mm ~ 0.8mm.
3.2.6 pure iron purity of more than 99.80%, a sulfur content of less than 0.0005%, particle size 0.8mm ~ 1.68mm.
3.2.7 oxygen purity of more than 99.95%, if other levels of oxygen to obtain a low and consistent blank value, may also be used.
3.2.8 power source gas, nitrogen or compressed air, which contaminants (oil and water) of less than 0.5%.
3.2.9 ceramic crucible diameter × height, 23mm × 23mm or 25mm × 25mm, and above 1200 ℃ high temperature furnace
4h or by burning oxygen burning to blank the lowest value.
3.2.10 crucible tongs.
3.3 Instrument
3.3.1 Sulphur infrared absorption analyzer (sensitivity of 1.0 × 10-6) which means shown in Figure 1.
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