GB/T 15076.14-2008 English PDF (GBT15076.14-2008)

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GB/T 15076.14-2008: Methods for chemical analysis of tantalum and niobium -- Determination of oxygen content
GB/T 15076.14-2008
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 77.120.99
H 14
Replacing GB/T 15076.14-1994
Methods for chemical analysis of tantalum and niobium -
Determination of oxygen content
ISSUED ON: MARCH 31, 2008
IMPLEMENTED ON: SEPTEMBER 1, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Principle of the method ... 6
3 Materials ... 6
4 Instruments ... 6
5 Specimen ... 7
6 Analysis steps ... 7
7 Precision ... 8
8 Quality assurance and control ... 8
Foreword
GB/T 15076 Methods for chemical analysis of tantalum and niobium is divided into 16
parts:
-- GB/T 15076.1 Methods for chemical analysis of tantalum and niobium - Part 1:
Determination of tantalum content in niobium - Inductively coupled plasma
atomic emission spectrometry
-- GB/T 15076.2 Methods for chemical analysis of tantalum and niobium - Part 2:
Determination of niobium content in tantalum - Inductively coupled plasma
atomic emission spectrometry and stratigraphy gravimetry
-- GB/T 15076.3 Methods for chemical analysis of tantalum and niobium - Part 3:
Determination of copper content - Flame atomic absorption spectrometry
-- GB/T 15076.4 Methods for chemical analysis of tantalum and niobium - Part 4:
Determination of iron content - 1,10-Phenanthroline spectrophotometry
-- GB/T 15076.5 Methods for chemical analysis of tantalum and niobium - Part 5:
Determination of molybdenum and tungsten contents - Inductively coupled
plasma atomic emission spectrometry
-- GB/T 15076.6 Methods for chemical analysis of tantalum and niobium - Part 6:
Determination of silicon content - Inductively coupled plasma atomic emission
spectrometry
-- GB/T 15076.7 Methods for chemical analysis of tantalum and niobium - Part 7:
Determination of phosphorus content in niobium - 4-Formyloxy-pentyl ketone-
[2] extraction separation phosphomolybdate blue spectrophotometry and
inductively coupled plasma atomic emission spectrum
-- GB/T 15076.8 Methods for chemical analysis of tantalum and niobium -
Determination of carbon and sulphur contents
-- GB/T 15076.9 Methods for chemical analysis of tantalum and niobium -
Determination of iron, chromium, nickel, manganese, titanium, aluminum,
copper, tin, lead and zirconium contents in tantalum
-- GB/T 15076.10 Methods for chemical analysis of tantalum and niobium - Part
10: Determination of iron, nickel, chromium, titanium, zirconium, aluminum
and manganese contents in niobium - Direct current arc atomic emission
spectrometry
Methods for chemical analysis of tantalum and niobium -
Determination of oxygen content
1 Scope
This part specifies the method for determining the oxygen content in tantalum and
niobium.
This part is applicable to the determination of oxygen content in tantalum and niobium.
Determination range: 0.005%~1.2%.
2 Principle of the method
The test specimen is placed in a high-purity graphite crucible under a purified
helium/argon atmosphere, and melted at a high temperature with a low voltage and a
large current, and the oxygen compounds are reduced and decomposed. The oxygen
released from the sample combines with the carbon in the graphite crucible to form a
mixture of carbon monoxide and carbon dioxide. The carbon monoxide is converted
into carbon dioxide by rare earth copper oxide, and the generated carbon dioxide is
detected in an infrared cell.
3 Materials
3.1 Helium: with a purity of greater than 99.99%.
3.2 Argon: with a purity of greater than 99.99%.
3.3 High-purity nickel foil or nickel capsule: the oxygen content is not more than
0.002%.
3.4 High-purity graphite crucible.
3.5 Standard substances: Appropriate standard substances shall be selected. In principle,
the chemical composition of the standard substances shall be similar to that of the
analyzed samples.
4 Instruments
Pulse infrared oxygen analyzer: The instrument sensitivity is not less than 0.01 μg/g.