SN/T 1599-2005 PDF in English


SN/T 1599-2005 (SN/T1599-2005, SNT 1599-2005, SNT1599-2005)
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SN/T1599-2005 (SNT1599-2005): PDF in English

SN/T 1599-2005
SN
ENTRY AND EXIT INSPECTION AND QUARANTINE INDUSTRY
STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA
Determination for major elements in coal ash by ICP-
AES
ISSUED ON: MAY 20, 2005
IMPLEMENTED ON: DECEMBER 01, 2005
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Principles ... 4 
4 Reagents and materials ... 4 
5 Instruments and equipment... 5 
6 Preparation of coal ash samples ... 5 
7 Analytical procedures ... 5 
8 Result calculation ... 7 
9 Precision ... 7 
Appendix A (Informative) Working conditions of instruments and analysis
wavelengths of elements ... 9 
Determination for major elements in coal ash by ICP-
AES
1 Scope
This standard specifies the inductively coupled plasma atomic emission
spectrometry (referred to as ICP-AES) method, for the determination of the
content of SiO2, Al2O3, Fe2O3, CaO, MgO, TiO2, P2O5 K2O, Na2O, SO3 in coal
ash.
This standard applies to the determination of SiO2, Al2O3, Fe2O3, CaO, MgO,
TiO2, P2O5, K2O, Na2O, SO3 content in coal ash. Coke ash and coal gangue
lime can also make reference to this standard.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 212 Proximate analysis of coal (eqv ISO 11722)
GB 474 Preparation of coal sample (eqv ISO 1988)
GB/T 602 Chemical reagent - Preparations of standard solutions for impurity
(ISO 6353-1, NEQ)
3 Principles
The specimens are melted by lithium tetraborate, extracted by nitric acid, then
measured by inductively coupled plasma atomic emission spectrometer.
4 Reagents and materials
Unless otherwise stated, only reagents confirmed to be of analytically pure and
deionized water or water of equivalent purity are used in the analysis.
4.1 Anhydrous lithium tetraborate: Excellent grade pure.
4.2 Nitric acid (ρ = 1.42 g/mL).
4.3 Nitric acid solution (1 + 9): Mix 1 volume of nitric acid (4.2) with 9 volumes
of water.
4.4 Standard solution: The standard solution of each element can be prepared
according to GB/T 602 method, OR it may directly use certified standard
solution. The mass concentration is 1000 mg/L (or 500 mg/L).
5 Instruments and equipment
5.1 ICP-AES: It is equipped with computer control and data processing system.
5.2 Analytical balance: Sensitivity is 0.0001 g.
5.3 Muffle furnace: It is equipped with temperature control device, which can
control the temperature at (1000 ± 10) °C.
5.4 Electric heating plate: The temperature is adjustable.
5.5 Platinum crucible: 30 mL.
5.6 Volumetric flask: 200 mL.
6 Preparation of coal ash samples
Take an appropriate amount of coal samples, which are prepared by the method
of GB 474 for air-drying analysis. Perform ashing, according to the ashing steps
of the slow ashing method in GB/T 212. The obtained ash is ground in an agate
mortar AND all passed through a 160-mesh sieve. Then it is placed in an ash
dish; burned at (815 ± 10) °C for 30 min, until reaching the constant weight.
7 Analytical procedures
7.1 Preparation of specimen solution
Weigh 0.1 g of ash sample (accurate to 0.1 mg), in a platinum crucible, which
was pre-loaded with 0.5 g of lithium tetraborate (4.1). Stir it evenly. Melt it in a
muffle furnace, which was pre-heated to (1000 ± 10) °C, for 10 min. Shake the
crucible. Melt it for another 5 min. The whole melting process does not exceed
20 min. Take out the crucible. Cool it slightly. Put the crucible into a 250 mL
beaker, which contains 150 mL of nitric acid solution (4.3). Place it on a hot
plate to heat it. Stir it constantly. After the frit is completely dissolved, remove
.......
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