GB/T 8647.9-2006 English PDF (GB/T8647.9-2006)

GB/T 8647.9-2006: The methods for chemical analysis of nickel -- Determination of carbon content -- Infra-red absorption method after high frequency induction furnace combustion
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GB/T 8647.9-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.30
H 13
Replacing GB/T 8647.10-1988
The methods for chemical analysis of nickel - Determination
of carbon content -- Infra-red absorption method after high
frequency induction furnace combustion
(ISO 7524:1985, Nickel, ferronickel and nickel alloys -- Determination of carbon
content -- Infra-red absorption method induction furnace combustion, NEQ)
ISSUED ON: SEPTEMBER 26, 2006
IMPLEMENTED ON: FEBRUARY 01, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Method summary ... 5
3 Reagents ... 5
4 Instruments ... 6
5 Analysis steps ... 6
6 Precision ... 7
7 Quality assurance and control ... 8
Foreword
GB/T 8647 "The methods for chemical analysis of nickel" is divided into the following
10 parts:
GB/T 8647.1, The methods for chemical analysis of nickel -- Determination of iron
content -- Sulfosalicylic acid spectrophotometric method
GB/T 8647.2, The methods for chemical analysis of nickel -- Determination of
aluminium content -- Electrothermal atomic absorption spectrometric method
GB/T 8647.3, The methods for chemical analysis of nickel -- Determination of silicon
content -- Molybdenum blue spectrophotometric method
GB/T 8647.4, The methods for chemical analysis of nickel -- Determination of
phosphorous content -- Molybdenum blue spectrophotometric method
GB/T 8647.5, The methods for chemical analysis of nickel -- Determination of
magnesium content -- Flame atomic absorption spectrometric method
GB/T 8647.6, The methods for chemical analysis of nickel -- Determination of cadmium,
cobalt, copper, manganese, lead and zinc contents -- Flame atomic absorption
spectrometric method
GB/T 8647.7, The methods for chemical analysis of nickel -- Determination of arsenic
antimony bismuth tin and lead contents -- Electrothermal atomic absorption
spectrometric method
GB/T 8647.8, The methods for chemical analysis of nickel -- Determination of sulphur
content -- Infra-red absorption method after high frequency induction furnace
combustion
GB/T 8647.9, The methods for chemical analysis of nickel -- Determination of carbon
content -- Infra-red absorption method after high frequency induction furnace
combustion
GB/T 8647.10, The methods for chemical analysis of nickel -- Determination of arsenic
cadmium lead zinc antimony bismuth tin cobalt copper manganese magnesium silicon
aluminium iron contents -- Atomic emission spectrometric method
This is Part 9.
This Part is not equivalent to ISO 7524:1985 "Nickel, ferronickel and nickel alloys --
Determination of carbon content -- Infra-red absorption method induction furnace
combustion".
The methods for chemical analysis of nickel - Determination
of carbon content -- Infra-red absorption method after high
frequency induction furnace combustion
1 Scope
This Part specifies the method for the determination of carbon content in nickel.
This Part is applicable to the determination of carbon content in nickel. Determination
range: 0.0020%~0.20%.
2 Method summary
In the presence of flux, oxygen flow is introduced into the high-frequency induction
furnace. The test material is burned at high temperature. Carbon generates carbon
dioxide gas and enters the infrared absorption cell. The instrument automatically
measures its absorption of infrared energy, calculates and displays the result.
3 Reagents
3.1 Anhydrous magnesium perchlorate [Mg(ClO4)2].
3.2 Caustic soda asbestos.
3.3 Glass wool.
3.4 Cotton wool.
3.5 Platinum-coated silicone.
3.6 Flux: low sulfur tungsten, tin, iron: W+Sn+Fe (1 g+0.2 g~0.25 g+0.2 g).
3.7 Crucible
Ceramic crucible (Φ24 mm×24 mm). Before use, it should be burned in a furnace with
air or oxygen at a temperature greater than 1100°C for 1 h~1.5 h. Take it out and place
it in a non-oiled desiccator to cool it for use (valid for two days).
3.8 Standard steel sample: carbon content is 0.002%~0.3%.
3.9 Standard steel sample or pure iron sample: carbon content is about 0.002%.
standard steel sample is stable within the error range.
NOTE: When selecting a standard steel sample, the carbon content should be greater than the
carbon content of the specimen being tested.
5.4 Calibration blanks
5.4.1 Weigh 1.000 g of low carbon standard steel sample (3.9) and place it in a crucible
(3.7). Add flux (3.6).
5.4.2 Place the crucible on the support of the furnace. Raise it to the burning position.
Follow the "automatic" blank calibration steps in the instrument manual. Repeat for 3
to 5 steel samples to obtain an average result with good reproducibility. The mass
fraction of carbon in the standard steel sample is deducted by "automatic" blank
correction. The value is expressed in %. The blank value obtained is stored in the
computer. (When the carbon content of the sample is > 0.001%, the blank value should
be < 0.0005%. When the carbon content of the sample is > 0.1%, 5.4 is omitted)
5.4.3 After the blank value is determined, repeat the test of the standard steel sample
according to (5.3). The test result should be stable within the error range. Then select a
standard sample with the same carbon content as the sample being tested for retest.
5.5 Determination
5.5.1 Weigh 1.000 g of specimen and place it in a crucible (3.7). Add flux (3.6).
5.5.2 Place the crucible on the support of the furnace. Raise it to the combustion position.
Follow the "automatic" analysis steps in the instrument manual. The instrument
automatically deducts the blank value and displays and prints the mass fraction of
carbon. The value is expressed in %.
6 Precision
6.1 Repeatability limit
For the determination values of two independent test results obtained under
repeatability conditions, the absolute difference between the two test results does not
exceed the repeatability limit (r) within the range of the average values given below.
The case where the repeatability limit (r) is exceeded does not exceed 5%. The intra-
laboratory repeatability is listed in Table 2.
GB/T 8647.9-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.30
H 13
Replacing GB/T 8647.10-1988
The methods for chemical analysis of nickel - Determination
of carbon content -- Infra-red absorption method after high
frequency induction furnace combustion
(ISO 7524:1985, Nickel, ferronickel and nickel alloys -- Determination of carbon
content -- Infra-red absorption method induction furnace combustion, NEQ)
ISSUED ON: SEPTEMBER 26, 2006
IMPLEMENTED ON: FEBRUARY 01, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Method summary ... 5
3 Reagents ... 5
4 Instruments ... 6
5 Analysis steps ... 6
6 Precision ... 7
7 Quality assurance and control ... 8
Foreword
GB/T 8647 "The methods for chemical analysis of nickel" is divided into the following
10 parts:
GB/T 8647.1, The methods for chemical analysis of nickel -- Determination of iron
content -- Sulfosalicylic acid spectrophotometric method
GB/T 8647.2, The methods for chemical analysis of nickel -- Determination of
aluminium content -- Electrothermal atomic absorption spectrometric method
GB/T 8647.3, The methods for chemical analysis of nickel -- Determination of silicon
content -- Molybdenum blue spectrophotometric method
GB/T 8647.4, The methods for chemical analysis of nickel -- Determination of
phosphorous content -- Molybdenum blue spectrophotometric method
GB/T 8647.5, The methods for chemical analysis of nickel -- Determination of
magnesium content -- Flame atomic absorption spectrometric method
GB/T 8647.6, The methods for chemical analysis of nickel -- Determination of cadmium,
cobalt, copper, manganese, lead and zinc contents -- Flame atomic absorption
spectrometric method
GB/T 8647.7, The methods for chemical analysis of nickel -- Determination of arsenic
antimony bismuth tin and lead contents -- Electrothermal atomic absorption
spectrometric method
GB/T 8647.8, The methods for chemical analysis of nickel -- Determination of sulphur
content -- Infra-red absorption method after high frequency induction furnace
combustion
GB/T 8647.9, The methods for chemical analysis of nickel -- Determination of carbon
content -- Infra-red absorption method after high frequency induction furnace
combustion
GB/T 8647.10, The methods for chemical analysis of nickel -- Determination of arsenic
cadmium lead zinc antimony bismuth tin cobalt copper manganese magnesium silicon
aluminium iron contents -- Atomic emission spectrometric method
This is Part 9.
This Part is not equivalent to ISO 7524:1985 "Nickel, ferronickel and nickel alloys --
Determination of carbon content -- Infra-red absorption method induction furnace
combustion".
The methods for chemical analysis of nickel - Determination
of carbon content -- Infra-red absorption method after high
frequency induction furnace combustion
1 Scope
This Part specifies the method for the determination of carbon content in nickel.
This Part is applicable to the determination of carbon content in nickel. Determination
range: 0.0020%~0.20%.
2 Method summary
In the presence of flux, oxygen flow is introduced into the high-frequency induction
furnace. The test material is burned at high temperature. Carbon generates carbon
dioxide gas and enters the infrared absorption cell. The instrument automatically
measures its absorption of infrared energy, calculates and displays the result.
3 Reagents
3.1 Anhydrous magnesium perchlorate [Mg(ClO4)2].
3.2 Caustic soda asbestos.
3.3 Glass wool.
3.4 Cotton wool.
3.5 Platinum-coated silicone.
3.6 Flux: low sulfur tungsten, tin, iron: W+Sn+Fe (1 g+0.2 g~0.25 g+0.2 g).
3.7 Crucible
Ceramic crucible (Φ24 mm×24 mm). Before use, it should be burned in a furnace with
air or oxygen at a temperature greater than 1100°C for 1 h~1.5 h. Take it out and place
it in a non-oiled desiccator to cool it for use (valid for two days).
3.8 Standard steel sample: carbon content is 0.002%~0.3%.
3.9 Standard steel sample or pure iron sample: carbon content is about 0.002%.
standard steel sample is stable within the error range.
NOTE: When selecting a standard steel sample, the carbon content should be greater than the
carbon content of the specimen being tested.
5.4 Calibration blanks
5.4.1 Weigh 1.000 g of low carbon standard steel sample (3.9) and place it in a crucible
(3.7). Add flux (3.6).
5.4.2 Place the crucible on the support of the furnace. Raise it to the burning position.
Follow the "automatic" blank calibration steps in the instrument manual. Repeat for 3
to 5 steel samples to obtain an average result with good reproducibility. The mass
fraction of carbon in the standard steel sample is deducted by "automatic" blank
correction. The value is expressed in %. The blank value obtained is stored in the
computer. (When the carbon content of the sample is > 0.001%, the blank value should
be < 0.0005%. When the carbon content of the sample is > 0.1%, 5.4 is omitted)
5.4.3 After the blank value is determined, repeat the test of the standard steel sample
according to (5.3). The test result should be stable within the error range. Then select a
standard sample with the same carbon content as the sample being tested for retest.
5.5 Determination
5.5.1 Weigh 1.000 g of specimen and place it in a crucible (3.7). Add flux (3.6).
5.5.2 Place the crucible on the support of the furnace. Raise it to the combustion position.
Follow the "automatic" analysis steps in the instrument manual. The instrument
automatically deducts the blank value and displays and prints the mass fraction of
carbon. The value is expressed in %.
6 Precision
6.1 Repeatability limit
For the determination values of two independent test results obtained under
repeatability conditions, the absolute difference between the two test results does not
exceed the repeatability limit (r) within the range of the average values given below.
The case where the repeatability limit (r) is exceeded does not exceed 5%. The intra-
laboratory repeatability is listed in Table 2.