JB/T 6237.4-1992Electrical contact with the chemical analysis of silver spectrophotometric determination of nickel content Methyl 2- (5-bromo-2-pyridyl azo) -5 diethylaminophenol spectrophotometric (English PDF)
电触头用银粉化学分析方法---2-(5-溴-2-吡啶偶氨)-5-二乙氨基苯酚分光光度法测定镍量
JB/T 6237.4 | Evolution and historical versions
| Std ID | Title | Status |
|---|---|---|
| JB/T 6237.4-2008 | Test methods for chemical analysis of silver powder for electric contact material. Part 4: Determinatiln of nickel content | Valid |
| JB/T 6237.4-1992 | Electrical contact with the chemical analysis of silver spectrophotometric determination of nickel content Methyl 2- (5-bromo-2-pyridyl azo) -5 diethylaminophenol spectrophotometric | Obsolete |
JB/T 6237.4-1992 is obsolete. It has been replaced by JB/T 6237.4-2008. This page sells the obsolete edition, for projects and contracts that still cite it.
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Issued by
Ministry of Machinery Industry
Level / Type
Industry · Recommended
Issue date
June 26, 1992
Implementation date
January 1, 1993
Scope
JB/T 6237.4-1992 is the English-translated version of 电触头用银粉化学分析方法---2-(5-溴-2-吡啶偶氨)-5-二乙氨基苯酚分光光度法测定镍量.
JB/T 6237.4-1992 is the Chinese industry standard "Electrical contact with the chemical analysis of silver spectrophotometric determination of nickel content Methyl 2- (5-bromo-2-pyridyl azo) -5 diethylaminophenol spectrophotometric".
It was issued on June 26, 1992 by the Ministry of Machinery Industry, and took effect on January 1, 1993. It is obsolete: it has been replaced by JB/T 6237.4-2008.
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Document preview — JB/T 6237.4-1992
National Standard of the People's Republic of China
Issued by: Ministry of Machinery Industry
Contents
- Document data
1 Document data
Sector: Machinery (industry standard).
Issuing body: Ministry of Machinery Industry.
Date of issue: 1992-06-26.
Date of implementation: 1993-01-01.
Status: obsolete, replaced by JB/T 6237.4-2008.
......
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
JB/T 6237.5-2008 — Methods for chemical analysis of silver powder for contact materials - Part 5: Determination of sodium content by flame atomic absorption spectrometry
JB/T 6237.3-1992 — Electrical contact with the chemical analysis of silver. Phenanthroline spectrophotometric determination of iron content
JB/T 6237.5-1992 — Silver electrical contacts chemical analysis methods - Determination of nickel content by flame atomic absorption spectrometry
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JB/T 6237.4-1992
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