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GB/T 223.73-2008: Iron, steel and alloy -- Determination of iron contents -- Titanium trichloride-potassium dichromate titration method
Status: Valid GB/T 223.73: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 223.73-2008 | English | 189 |
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Iron, steel and alloy -- Determination of iron contents -- Titanium trichloride-potassium dichromate titration method
| Valid |
GB/T 223.73-2008
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| GB/T 223.73-1991 | English | 199 |
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Methods for chemical analysis of iron, steel and alloy--The titanium trichloride-potassium dichromate volumetric method for the determination of iron content
| Obsolete |
GB/T 223.73-1991
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PDF similar to GB/T 223.73-2008
Basic data | Standard ID | GB/T 223.73-2008 (GB/T223.73-2008) | | Description (Translated English) | Iron, steel and alloy -- Determination of iron contents -- Titanium trichloride-potassium dichromate titration method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.080.01 | | Word Count Estimation | 8,871 | | Date of Issue | 2008-05-13 | | Date of Implementation | 2008-11-01 | | Older Standard (superseded by this standard) | GB/T 223.73-1991 | | Quoted Standard | GB/T 6379.1; GB/T 6379.2; GB/T 20066 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.8 (Total No.121) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the use of titanium trichloride-potassium dichromate titration of iron content. This section applies to high-temperature alloys and precision alloys for the determination of the mass fraction of 0. 50% ~ 8. 00% iron content. | GB/T 223.73-2008: Iron, steel and alloy -- Determination of iron contents -- Titanium trichloride-potassium dichromate titration method
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Iron, steel and alloy. Determination of iron contents. Titanium trichloride-potassium dichromate titration method
ICS 77.080.01
H11
National Standards of People's Republic of China
Replacing GB/T 223.73-1991
Determination of iron, steel and alloy content
Titanium trichloride - potassium dichromate titration
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
Titanium This section GB/T 223 instead of GB/T 223.73-1991 "steel and alloy chemical analysis method trichloride - potassium content
Determination of iron content "Method.
This portion of the GB/T 223.73-1991 compared primarily with the following modifications.
--- To modify the standard name;
--- Increased water analysis reagents and instructions to modify the content and concentration of representation;
--- Modify Weigh Sample volume representation;
--- Modification result in the amount of formula and formula unit;
--- Specification precision functional description.
Appendix A of this section is informative appendix.
This part is proposed by the China Iron and Steel Association.
This part of the National Steel Standardization Technical Committee.
This section drafted by. China Iron and Steel Research Institute Group.
The main drafters of this section. Cuiqiu Hong, Wang Yuxing.
This part of the standard replaces the previous editions are.
GB 223.73 (a) -1981, GB 223.73-1991.
Determination of iron, steel and alloy content
Titanium trichloride - potassium dichromate titration
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
GB/T 223 provisions of this part of the titanium trichloride - potassium dichromate titration Determination of iron content.
This section applies to high-temperature alloys and precision alloys for the determination of the mass fraction of 0.50% - 8.00% iron content.
2 Normative references
The following documents contain provisions which, through reference GB/T 223 of this text, constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 6379.1 measurement methods and results of Accuracy (trueness and precision) - Part 1. General principles and definitions
GB/T 6379.2 measurement methods and results of Accuracy (trueness and precision) - Part 2. Determine the weight of a standard measurement method
The basic method of refolding and reproducibility
GB/T 20066 Steel and iron - Sampling and determination of the chemical composition of the sample with a sample preparation method
Principle 3
Samples with hydrochloric acid - nitric acid dissolution mixed with smoke perchlorate, chromium and niobium acid sufficiently dehydrated, heat soluble salts dissolved in hydrochloric acid
Class, and then ammonia precipitation of iron to nickel, chromium and other element separation. With dilute hydrochloric acid to dissolve the ferric hydroxide, sodium tungstate as indicator, titanium trichloride
The ferric iron is reduced to divalent. Low potassium dichromate with an excess of titanium oxide is expensive. Then to diphenylamine sulfonate as indicator, potassium dichromate
Divalent iron standard solution titration.
4 Reagents and materials
Unless otherwise stated, the analysis using only the confirmation of analytical grade reagents and distilled water or its equivalent purity.
4.1 ammonium chloride.
4.2 hydrochloric acid, ρ about 1.19g/mL.
4.3 hydrochloride, ρ of about 1.19g/mL, diluted 1 + 3.
4.4 hydrochloride, ρ of about 1.19g/mL, diluted to 5 + 95.
4.5 nitric acid, ρ about 1.42g/mL.
4.6 nitric acid, ρ about 1.42g/mL, diluted 1 + 1.
4.7 perchloric acid, ρ about 1.67g/mL.
4.8 sulfuric acid - phosphoric acid mixture. A 150mL sulfuric acid (ρ about 1.84g/mL), 200mL phosphate (ρ about 1.69g/mL) was slowly poured into
650mL of water and continue stirring and cooling.
4.9 ammonia, ρ about 0.90g/mL.
4.10 ammonia, ρ about 0.90g/mL, diluted to 5 + 95.
4.11 sodium hydroxide solution, 200g/L.
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