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SN/T 3323.2-2012 PDF in English


SN/T 3323.2-2012 (SN/T3323.2-2012, SNT 3323.2-2012, SNT3323.2-2012)
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SN/T 3323.2-2012: PDF in English (SNT 3323.2-2012)

SN/T 3323.2-2012
ENTRY-EXIT INSPECTION AND QUARANTINE INDUSTRY
STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA
Mill scale - Part 2: Determination of sulfur content - High
frequency combustion infrared absorption method
ISSUED ON: DECEMBER 12, 2012
IMPLEMENTED ON: JULY 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Method summary ... 4
4 Reagents ... 4
5 Instruments and equipment ... 5
6 Sampling and sample preparation ... 5
7 Analysis steps ... 5
8 Precision ... 6
Foreword
SN/T 3323 "Mill scale" consists of 5 parts:
- Part 1: Determination of ferrous oxide - Potassium dichromate titration;
- Part 2: Determination of sulfur content - High frequency combustion infrared
absorption method;
- Part 3: Determination of lead, chromium, cadmium. Inductively coupled plasma
atomic emission spectrometry
- Part 4: Determination of arsenic and mercury - Atomic fluorescence spectrometric
method;
- Part 5: Determination of iron and silicon, calcium, phosphorus, manganese,
aluminium, titanium and magnesium - X-ray fluorescence spectrometric method.
This Part is Part 2 of SN/T 3323.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part was proposed by and shall be under the jurisdiction of National Certification
and Accreditation Administration Commission.
The drafting organizations of this Part: Tianjin Entry-Exit Inspection And Quarantine
Bureau of the People's Republic of China.
Main drafters of this Part: Wang Hong, Li Yi, Chen Guangzhi, Wu Suru, Wang Zhaorui,
Hou Shujian.
Mill scale - Part 2: Determination of sulfur content - High
frequency combustion infrared absorption method
1 Scope
This Part of SN/T 3323 specifies high frequency combustion infrared absorption
method, the method to determine the sulfur content in mill scale.
This Part is applicable to the determination of sulfur content in mill scale. The
determination range is 0.002%~0.40%.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 2007.1, General rules for the sampling and sample preparation of minerals in
bulk - Sampling by manual method
GB/T 2007.2, General rules for the sampling and sample preparation of minerals in
bulk - Sample preparation by manual method
3 Method summary
The test material is heated and burned in the oxygen flow of the high-frequency
induction furnace. The generated sulfur dioxide is carried by oxygen to the measuring
chamber of the infrared analyzer. Detect the infrared absorption energy of sulfur dioxide
for specific wavelengths. Its absorption energy is proportional to its concentration. The
sulfur content can be measured according to the change in the energy received by the
detector.
4 Reagents
Unless otherwise stated, all reagents are analytically pure.
4.1 Pure iron flux: The particle size is less than 1.25mm. The carbon content is less than
0.0005%. The sulfur content is less than 0.0005%.
4.2 Tungsten-tin mixed flux: The ratio is 9:1, the carbon content is less than 0.0010%.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.