GB/T 223.37-1989Methods for chemical analysis of iron, steel and alloy. The indophenol blue photometric methods for the determination of nitrogen content after distillation separation (English PDF)
钢铁及合金化学分析方法 蒸馏分离-靛酚蓝光度法测定氮量
GB/T 223.37 | Evolution and historical versions
| Std ID | Title | Status |
|---|---|---|
| GB/T 223.37-2020 | Iron, steel and alloy--Determination of nitrogen content--Indophenol blue spectrophotometric method after distillation separation | Valid |
| GB/T 223.37-1989 | Methods for chemical analysis of iron, steel and alloy. The indophenol blue photometric methods for the determination of nitrogen content after distillation separation | Obsolete |
GB/T 223.37-1989 is obsolete. It has been replaced by GB/T 223.37-2020. This page sells the obsolete edition, for projects and contracts that still cite it.
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Issued by
State Bureau of Technical Supervision
Level / Type
National · Recommended
Issue date
March 31, 1989
Implementation date
July 1, 1990
Scope
GB/T 223.37-1989 is the English-translated version of 钢铁及合金化学分析方法 蒸馏分离-靛酚蓝光度法测定氮量.
GB/T 223.37-1989 is the Chinese national standard "Methods for chemical analysis of iron, steel and alloy. The indophenol blue photometric methods for the determination of nitrogen content after distillation separation".
It was issued on March 31, 1989 by the State Bureau of Technical Supervision, and took effect on July 1, 1990. It is obsolete: it has been replaced by GB/T 223.37-2020.
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Document preview — GB/T 223.37-1989
National Standard of the People's Republic of China
Issued by: State Bureau of Technical Supervision
Contents
- Document data
1 Document data
Sector: National standard (Recommended).
Issuing body: State Bureau of Technical Supervision.
Date of issue: 1989-03-31.
Date of implementation: 1990-07-01.
Status: obsolete, replaced by GB/T 223.37-2020.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.
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Related Standards
GB/T 223.38-1985 — Methods for chemical analysis of iron, steel and alloy. The anion-exchange separation-gravimetric method for the determination of niobium content
GB/T 223.36-1994 — Methods for chemical analysis of iron, steel and alloy--The neutral titration method for the determination of nitrogen content after distillation separation
GB/T 223.40-2007 — Iron, steel and alloy - Determination of niobium content - The sulphochlorophenol S spectrophotometric method
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GB/T 223.37-1989
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