GB/T 40062-2021Method for determination of total inorganic chloride in denatured fuel ethanol and fuel ethanol—Ion chromatography (English PDF)
变性燃料乙醇和燃料乙醇中总无机氯的测定方法 离子色谱法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
April 30, 2021
Implementation date
November 1, 2021
Scope
GB/T 40062-2021 is the English-translated version of 变性燃料乙醇和燃料乙醇中总无机氯的测定方法 离子色谱法.
GB/T 40062-2021 is the Chinese national method for determining total inorganic chloride in denatured fuel ethanol and fuel ethanol by ion chromatography.
It covers the reagents and materials, including the chloride ion standard solutions and the sodium carbonate and sodium hydrogen carbonate eluent, and the instruments: an ion chromatograph with an anion exchange column, a suppressor and a conductivity detector, an analytical balance, an oven and a nitrogen-blowing instrument.
It then describes the analysis steps, the calculation from peak area or peak height, how results are reported and rounded according to GB/T 8170, repeatability and reproducibility at a 95% confidence level, and quality assurance and control.
The measuring range is 0.08 mg/L to 10.0 mg/L. It was issued on 30 April 2021 and has applied since 1 November 2021.
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Document preview — GB/T 40062-2021
National Standard of the People's Republic of China
- ICS
- 75.160.20
- Classification
- E 31
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Principle5
- 5 Reagents and materials5
- 6 Instruments and apparatuses6
- 7 Analysis steps7
- 8 Calculation8
- 9 Description of the analysis result9
- 10 Accuracy (95% confidence level)9
- 11 Quality assurance and control10
1 Scope
This Standard specifies the ion chromatography for the determination of total inorganic chlorine content in denatured fuel ethanol and fuel ethanol, including reagents and materials, instruments and apparatuses, analysis procedures, calculations, expression of analysis results, accuracy (95% confidence level) and quality assurance and control.
This Standard applies to the determination of total inorganic chloride ion content in denatured fuel ethanol and fuel ethanol.
Note: The determination content range of total inorganic chloride ions in this Standard is 0.08 mg/L ~ 10.0 mg/L; the detection-limit is 0.02 mg/L.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 8170, Rules of rounding off for numerical values & expression and judgment of limiting values
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1 Denatured fuel ethanol
The fuel ethanol that is used to prepare ethanol-added gasoline for vehicles, after adding denaturant.
5 Reagents and materials
5.7 Sodium carbonate/sodium hydrogen carbonate eluent
Prepare the mixed solution of 4.5 mmol/L sodium carbonate and 1.4 mmol/L sodium hydrogen carbonate as follows:
a) Before use, burn sodium carbonate (5.3) at 270 °C ~ 300 °C to constant weight; weigh 47.70 g of sodium carbonate and 11.76 g of sodium hydrogen carbonate (5.4); dissolve in water and place in a 100 mL volumetric flask; use water to fix volume; prepare to obtain a mixed solution of 4.5 mol/L sodium carbonate and 1.4 mol/L sodium hydrogen carbonate, as a sodium carbonate/sodium hydrogen carbonate stock solution; seal and store in the refrigerator freezer at 4 °C. The validity period is not more than 3 months;
b) Before use, accurately transfer 2.0 mL of the above sodium carbonate/sodium hydrogen carbonate stock solution; place it in a 2 L volumetric flask; use water to fix volume; mix well; prepare the sodium carbonate/sodium hydrogen carbonate eluent.
6 Instruments and apparatuses
6.3 Oven.
6.4 Desiccator.
6.5 Nitrogen-blowing instrument.
6.1 Ion chromatograph, including
-- Chromatographic column: anion exchange separation column and anion protection column;
-- Sample injection device: including six-way valve, sample quantitative loop and injector;
-- Suppressor: anion automatic electrolysis regenerative membrane suppressor or other equivalent suppressors;
-- Conductivity detector: for temperature compensation or automatic range adjustment;
-- Chromatography data system.
6.2 Analytical balance
The sensitivity is 0.000 1g.
9 Description of the analysis result
For any sample, use the arithmetic average of two repeated measurement results to report the analysis results; round the results to one decimal place according to the provisions of GB/T 8170.
10 Accuracy (95% confidence level)
Repeatability: In the same laboratory, when the same analyst uses the same instrument, under the same operating parameters, with standard and accurate operations, to repeatedly measure the same sample, the difference between the two results shall not exceed the value in Table 2.
Reproducibility: When the same determination is performed by different analysts in different laboratories, the difference between the two independent determination results obtained shall not exceed the value in Table 2. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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