GB/T 7702.6-2008Test method for granular activated carbon from coal - Determination of methylene blue adsorption (English PDF)

Foreword

GB/T 7702 "Test Method for Granular Activated Carbon from Coal" is divided into.

- Part 1. Determination of Moisture;

- Part 2. Determination of Particle Size;

- Part 3. Determination of Hardness;

- Part 4. Determination of Packing Density;

- Part5. Determination of Absorption of Water;

- Part 6. Determination of Methylene Blue Absorption;

- Part 7. Determination of Iodine Number;

- Part 8. Determination of Phenol Absorption;

- Part 9. Determination of Ignition Temperature;

- Part 10. Determination of Service Life against Benzene and Chloroethane Vapours;

- Part 13. Determination of CCL4 Vapour Absorption;

- Part14. Determination of Sulphur Capacity;

- Part 15. Determination of Ash Content;

- Part 16. Determination of pH Value;

- Part 17. Determination of Floatation Ratio;

- Part 18. Determination of Caramel Absorption;

- Part 19. Determination of Carbon Tetrachloride (CCl4) Desorption;

- Part 20. Determination of Pore Volume and Specific Surface Area.

This Part is part 6 of GB/T 7702.

This Part replaces GB/T 7702.6-1997 Standard test method for methylene blue adsorption of granular activated carbon from coal.

Compared with GB/T 7702.6-1997, the main changes of this Part are as follows.

a) Specify the requirements of water used in laboratory;

b) Specify the level and specifications of filter paper used in analyzing process;

c) Add the eliminating method of moisture in methylene blue reagent;

d) Change the oscillation and adsorption time of test portion to methylene blue solution from 20 min to 30 min;

e) Specify the calibration precision of methylene blue solution;

f) Specify the weighing range of test portion; improve the weighing accuracy;

g) Add Chapter 3 "Terms and definitions".

1 Scope

This Part specifies the content such as determination principle, determination procedures, and result calculation of methylene blue absorption of granular activated carbon from coal.

This section applies to the determination of methylene blue absorption of granular activated carbon from coal and also applies to powdered activated carbon from coal.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this Part of GB/T 7702. For dated reference, the subsequent amendments (excluding correction) or revisions of these publications do not apply. However, the parties who enter into agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.

GB/T 601-2002 Chemical Reagent - Preparations of Standard Volumetric Solutions

GB/T 625 Chemical Reagent - Sulfuric Acid (GB/T 625-2007, ISO 6353-2. 1983, NEQ)

GB/T 665 Chemical reagent - Copper (II) sulfate pentahydrate (GB/T 665-2007, ISO 6353-2. 1983, NEQ)

GB/T 1263 Chemical reagent - Disodium hydrogen phosphate dodecahydrate (GB/T 1263-2006, ISO 6353-2. 1983, NEQ)

GB/T 1272 Chemical reagent - Potassium iodide (GB/T 1272-2007, ISO 6353-2. 1983, NEQ)

GB/T 1274 Chemical reagent - Potassium dihydrogen phosphate (GB/T 1274-1993, neq ISO 6353-3. 1987 R79)

GB/T 1914 Chemical analytical filter paper

GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods (GB/T 6682-1992, neq ISO 3696:1987) this filtrate AND absorbance reading of copper sulfate standard solution shall be within a range of ±0.020.

8 Determination procedures

8.4 If it is beyond the above range, it shall adjust the milliliters added to methylene blue solution; repeat the operation in 8.1 to 8.3, until it meets requirements.

9 Result calculations

Methylene blue absorption, in E, its value is expressed in milligrams per gram (mg/g), is calculated according to Formula (3). VE... (3) Where.

rho - Concentration of methylene blue solution, in milligrams per milliliter (mg/mL);

V - Volume of consumed methylene blue solution for sample determination, in milliliters (mL); m - Mass of test sample, in grams (g).

10 Precision

For each sample, make parallel determination of two test portions. The difference shall not be greater than 8 mg/g. The results are expressed in arithmetic mean value. Calculation results shall be accurate to integer.

11 Test report

Test report shall include the following aspects.

a) Serial number of test sample;

b) Standard used;

c) Method used;

d) Test item;

e) Test results;

f) Testing personnel; g) Test date. […]