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GB/T 8647.8-2006The methods for chemical analysis of nickel -- Determination of sulphur content -- Infra-red absorption method after high frequency induction furnace combustion (English PDF)

镍化学分析方法硫量的测定

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

Level / Type

National · Recommended

Issue date

September 26, 2006

Implementation date

February 1, 2007

Scope

GB/T 8647.8-2006 is the English-translated version of 镍化学分析方法硫量的测定.

GB/T 8647.8-2006 - This Part specifies the method for the determination of sulphur content in nickel. This Part is applicable to the determination of sulphur content in nickel. Determination range: 0.0010%~0.050%.

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Document preview — GB/T 8647.8-2006

National Standard of the People's Republic of China

ICS: 77.040.30
Classification: H 13

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

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 8.

This Part is not equivalent to ISO 7526-1985 "Nickel, ferronickel and nickel alloys --

Determination of sulphur content -- Infra-red absorption method after induction furnace

combustion".

The methods for chemical analysis of nickel - Determination

of sulphur content - Infra-red absorption method after high

frequency induction furnace combustion

1 Scope

This Part specifies the method for the determination of sulphur content in nickel.

This Part is applicable to the determination of sulphur content in nickel. Determination

range: 0.0010%~0.050%.

2 Method summary

In the presence of flux, oxygen flow is introduced into the high-frequency induction

furnace to make the test material burn at high temperature. Sulfur generates sulfur

dioxide gas and enters the infrared absorption cell. The instrument automatically

measures its absorption of infrared energy, calculates and displays the results.

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: W+Sn (1 g+0.2 g~0.25 g).

3.7 Crucible

Ceramic crucible (Phi24 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: sulfur content 0.002%~0.06%.

3.9 Steel standard sample or pure iron standard sample: sulfur content is about 0.002%.

within the error range.

NOTE: When selecting a standard steel sample, the sulfur content should be greater than the sulfur

content of the specimen being tested.

5.4 Calibration blanks

5.4.1 Weigh 0.500 g of 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

~ 5 steel samples to obtain an average result with good reproducibility. Deduct the mass

fraction of sulfur in the standard steel sample by "automatic" blank calibration. The

value is expressed in %. The blank value obtained is stored in the computer (blank value

should be < 0.0005%).

5.4.3 Repeat the test of the standard steel sample according to 5.3. The test result should

be stable within the error range. Select another standard sample with the same sulfur

content as the sample being tested for retest.

5.5 Determination

5.5.1 Weigh 0.500 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 sulfur.

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.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.

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