GB/T 19226-2003 PDF in English
GB/T 19226-2003 (GB/T19226-2003, GBT 19226-2003, GBT19226-2003)
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| GB/T 19226-2003 | English | 85 |
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Determination of vanadium in coal
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Standards related to (historical): GB/T 19226-2003
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GB/T 19226-2003: PDF in English (GBT 19226-2003) GB/T 19226-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Determination of vanadium in coal
ISSUED ON. JULY 1, 2003
IMPLEMENTED ON. NOVEMBER 1, 2003
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 Abstract ... 4
4 Reagents and Materials ... 4
5 Instrument and Apparatus ... 6
6 Measurement Steps ... 6
7 Result Calculation ... 8
8 Precision of the Method ... 8
9 Test Report ... 8
Determination of vanadium in coal
1 Scope
This Standard specifies the method abstract, reagents and materials, instrument and
apparatus, test procedures, calculation of results and method’s precision for the
determination of vanadium in coal.
This Standard is applicable to lignite, bituminous coal and anthracite.
2 Normative References
The provisions in the following documents become part of this Standard, through
reference in this Standard. For the dated documents, the subsequent amendments
(excluding corrections) or revisions shall not apply to this Standard. However, all
parties who enter into agreement according to this Standard are encouraged to study
if the latest versions of these documents are applicable. For undated documents, the
latest version applies to this Standard.
GB/T 483 General rules for analytical and testing methods of coal
3 Method Abstract
Perform ashing for the coal samples, then melt it with alkali and leach it with boiling
water. Add masking agents into the leachate to eliminate the influence of interfering
elements. In phosphoric acid medium -- pentavalent vanadium, 2-(5-bromo-2-
pyridylazo)-5-diethylaminophenol (Br-PADAP) and hydrogen peroxide FORM the
colored ternary complex; then, it shall perform the photometric measurement to
determine the content of vanadium.
4 Reagents and Materials
4.1 Sodium peroxide. granular.
4.2 Sodium hydroxide (GB 629). granular.
4.3 Sodium hydroxide solution. c(NaOH)=1 mol/L.
Weigh and take 40 g of sodium hydroxide; dissolve it in the water of 1L.
4.4 Sulfuric acid solution. c (1/2H2SO4) = 1 mol/L.
6.2.1 Ashing of coal samples
Accurately weigh and take 1 g of air-dried coal samples of which the particle size is
less than 0.2 mm (the accuracy of weigh shall be 0.0002 g); put it into the crucible (5.3);
place it into the muffle furnace (5.1); heat it gradually from room temperature to
(600±10°C); burn it at this temperature for at least 1 h until there is no black carbon
particles; remove the crucible and cool it to room temperature.
Note. The amount of sample can be appropriately increased or decreased according to the content of
vanadium.
6.2.2 Treatment of ash samples
In corundum crucible which contains ash sample, add 4 g of sodium hydroxide (4.2)
and 1 g of sodium peroxide (4.1); place it in the muffle furnace. Under the condition of
ensuring that the melt sample does not splatter or spill, gradually heat it from the room
temperature until (650 ± 10) °C. Under this temperature, melt it for 10 min ~ 15 min;
remove the crucible and cool it to room temperature.
Place the crucible in the beaker (5.6); add 50 mL ~ 60 mL of boiling water; boil for 1
min to 2 min on the electric furnace (5.8). Remove the beaker; wash it with hot water.
Transfer the solution to 100 mL volumetric flask (5.5); cool it to room temperature;
dilute it with water until the scale, shake it evenly; place it for overnight or use
qualitative filter paper (4.13) to perform dry filtration.
Note. Dry filtration refers to the filtration under the condition that the using instruments and materials (e.g..
funnels, beakers and filter paper, etc.) are both dry and clean.
6.2.3 Preparation of sample blank solution
When decomposing a batch of samples, it shall prepare a sample blank solution at the
same time. The preparation method shall be the same as 6.2.2, but the ash sample
shall not be added.
6.2.4 Determination
Accurately pipette 10 mL of the upper clear solution or filtrate of the sample AND 10
mL of the sample blank solution (6.2.3); respectively place them into 50 mL volumetric
flask; add 5 mL of mixed masking agent and 2 drops of p-nitrophenol indicator; use
sulfuric acid solution (4.5) to carefully adjust it from yellow to colorless. Follow 6.1.2
and 6.1.3, except that – use sample blank solution as the reference to determine the
absorbance of the sample solution. Find-obtain the content of vanadium pentoxide (μg)
in sample solution from working curve.
Note. According to the content of vanadium in sample’s total solution, the amount of liquid absorption can
be appropriately increased or decreased.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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