NY/T 1121.12-2006 English PDF (NYT1121.12-2006)

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NY/T 1121.12-2006: Soil Testing. Part 12: Method for determination of soil total chrome
NY/T 1121.12-2006
NY
AGRICULTURAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 13.080.05
B 11
Soil testing -
Part 12. Method for determination of soil total chrome
ISSUED ON. JULY 10, 2006
IMPLEMENTED ON. OCTOBER 01, 2006
Issued by. Ministry of Agriculture of the People's Republic of China
Table of contents
Foreword ... 3 
1 Scope of application ... 5 
2 Method summary ... 5 
3 Instruments and equipment ... 5 
4 Reagents and solutions ... 5 
5 Analysis steps ... 6 
6 Results analysis ... 7 
7 Precision ... 8 
8 Comments ... 8 
Foreword
NY/T 1121 Soil testing is a standard series, which include the following parts.
- Part 1. Soil sampling, processing, and reposition;
- Part 2. Method for determination of soil pH;
- Part 3. Method for determination of soil mechanical composition;
- Part 4. Method for determination of soil bulk density;
- Part 5. Method for determination of soil cation exchange capacity in
calcareous soil;
- Part 6. Method for determination of soil organic matter;
- Part 7. Method for determination of available phosphorous in acid soil;
- Part 8. Method for determination of soil available boron;
- Part 9. Method for determination of soil available molybdenum;
- Part 10. Method for determination of soil total hydrargyrum;
- Part 11. Method for determination of soil total arsenic;
- Part 12. Method for determination of soil total chrome;
- Part 13. Method for determination of soil exchangeable calcium and
magnesium;
- Part 14. Method for determination of soil available sulphur;
- Part 15. Method for determination of soil available silicon;
- Part 16. Method for determination of total water-soluble salt;
- Part 17. Method for determination of soil chloride ion content;
- Part 18. Method for determination of soil sulphate content;
...
This part is part 12 of NY/T 1121.
This part was proposed by AND shall be under the jurisdiction of Ministry of
Agriculture of the People's Republic of China.
Soil testing -
Part 12. Method for determination of soil total chrome
1 Scope of application
This part is applicable to the determination of chrome in various soils.
2 Method summary
After sulphuric acid, nitric acid, and phosphoric acid digestion, chromium
compounds in the soil are converted into soluble substance; USE potassium
permanganate to oxidize chromium into hexavalent chromium; USE sodium
azide to reduce and eliminate the excessive potassium permanganate; under
acidic conditions, hexavalent chromium reacts with diphenylcarbazide (DPC) to
form a purple-red compound, which is measured spectrophotometrically at a
wavelength of 540 nm.
3 Instruments and equipment
3.1 Spectrophotometer
3.2 Centrifuge
3.3 Electric hot plate
4 Reagents and solutions
The reagents and water used in this test method, unless otherwise stated, refer
to analytical grade reagents and grade 1 water as specified in GB/T 6682. The
solution, if not specified, is an aqueous solution.
4.1 Nitric acid (excellent grade pure, ρ = 1.42)
4.2 Sulphuric acid (excellent grade pure, ρ = 1.84)
4.3 Phosphoric acid (excellent grade pure, 85%)
4.4 Potassium permanganate (excellent grade pure)