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GB/T 40062-2021 (GB/T40062-2021)

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GB/T 40062-2021: PDF in English (GBT 40062-2021)
GB/T 40062-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.160.20
E 31
Method for determination of total inorganic chloride in
denatured fuel ethanol and fuel ethanol - Ion
chromatography
ISSUED ON: APRIL 30, 2021
IMPLEMENTED ON: NOVEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Principle ... 5 
5 Reagents and materials ... 5 
6 Instruments and apparatuses ... 6 
7 Analysis steps ... 7 
8 Calculation ... 8 
9 Description of the analysis result ... 9 
10 Accuracy (95% confidence level) ... 9 
11 Quality assurance and control ... 10 
Method for determination of total inorganic chloride in
denatured fuel ethanol and fuel ethanol - Ion
chromatography
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.
b) Chloride ion standard stock solution B (100 mg/L): accurately pipette 10.0
mL of chloride ion standard stock solution A; place it in a 100 mL
volumetric flask; use water to fix volume; mix well.
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
6.1 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.
6.3 Oven.
6.4 Desiccator.
6.5 Nitrogen-blowing instrument.
Where:
c -- content of chloride ions in the sample, in milligrams per liter (mg/L);
A -- peak area (or peak height) of chloride ions in the sample;
A0 -- peak area (or peak height) of the test blank;
a -- intercept of the regression equation;
b -- slope of the regression equation;
f -- dilution factor of the sample.
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.
Table 2 -- Repeatability and reproducibility
......
 
(Above excerpt was released on 2021-06-30, modified on 2021-06-30, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT40062-2021