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GB/T 8647.8-2006 PDF English

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GB/T 8647.8-2006: The methods for chemical analysis of nickel -- Determination of sulphur content -- Infra-red absorption method after high frequency induction furnace combustion
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GB/T 8647.8: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 8647.8-2006English130 Add to Cart 0-9 seconds. Auto-delivery The methods for chemical analysis of nickel -- Determination of sulphur content -- Infra-red absorption method after high frequency induction furnace combustion Valid
GB/T 8647.8-1988English239 Add to Cart 2 days Nickel--Determination of sulfur content--Oscillopolarographic method after distillation Obsolete

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


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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.040.30 H 13 Replacing GB/T 8647.8-1988, GB/T 8647.9-1988 The methods for chemical analysis of nickel - Determination of sulphur content - Infra-red absorption method after high frequency induction furnace combustion (ISO 7526:1985 Nickel, ferronickel and nickel alloys -- Determination of sulphur content -- Infra-red absorption method after 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 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 (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: 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. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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