NY/T 1121.12-2006 PDF English
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| NY/T 1121.12-2006 | English | 90 |
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Soil Testing. Part 12: Method for determination of soil total chrome
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NY/T 1121.12-2006: Soil Testing. Part 12: Method for determination of soil total chrome---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/NYT1121.12-2006
NY
AGRICULTURAL INDUSTRY STANDARD
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)
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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