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GB/T 32737-2016: Determination of nitrate nitrogen in soil -- Ultraviolet spectrophotometry method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 32737-2016 | English | 219 |
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Determination of nitrate nitrogen in soil -- Ultraviolet spectrophotometry method
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GB/T 32737-2016
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Basic data | Standard ID | GB/T 32737-2016 (GB/T32737-2016) | | Description (Translated English) | Determination of nitrate nitrogen in soil -- Ultraviolet spectrophotometry method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B10 | | Classification of International Standard | 13.080.10 | | Word Count Estimation | 11,123 | | Date of Issue | 2016-08-29 | | Date of Implementation | 2017-03-01 | | Regulation (derived from) | National Standard Announcement 2016 No.14 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 32737-2016: Determination of nitrate nitrogen in soil -- Ultraviolet spectrophotometry method
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Determination of nitrate nitrogen in soil - Ultraviolet spectrophotometry method
ICS 13.080.10
B10
National Standards of People's Republic of China
Determination of Soil Nitrate Nitrogen by UV Spectrophotometry
2016-08-29 released
2017-03-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed by the Ministry of Agriculture of the People's Republic of China.
This standard is under the responsibility of the National Soil Quality Standardization Technical Committee (SAC/TC404).
The drafting of this standard. Nanjing Institute of Soil Science, Chinese Academy of Sciences, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Chinese Academy of Sciences
Shuangbanna Tropical Botanical Garden, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, China
National Institute of Applied Ecology, Institute of Botany, Chinese Academy of Sciences, Jiangsu Provincial Institute of Standardization.
The main drafters of this standard. Sun Bo, Song Ge, Zhang Yuming, Chen Anlei, Fu Yun, Han Yong, Zong Haihong, Qiao Yunfa, Zhang Yan, He Nianpeng,
Determination of Soil Nitrate Nitrogen by UV Spectrophotometry
1 Scope
This standard specifies the principle, reagent, instrument, analysis procedure and result of the determination of nitrate nitrogen in soil leaching solution by ultraviolet spectrophotometry.
Calculation and representation, precision, quality assurance and control.
This standard applies to the determination of nitrate in soil. The detection limit of soil nitrate nitrogen was 0.5mg/kg, and the limit of quantification was
1mg/kg.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
HJ634 Soil Ammonia Nitrogen, Nitrite Nitrogen, Nitrate Nitrogen Determination Potassium Chloride Solution Extraction-Spectrophotometry
Method for determination of soil moisture
Determination of pH in soil by NY/T 1377
3 terms and definitions
The following terms and definitions apply to this document.
3.1
Absorbance absorbance
The intensity of the incident light before passing through the soil leaching solution and the ratio of the transmitted light intensity after the light passes through the soil leaching solution
The logarithm.
3.2
f value fvalue
The ratio of the absorbance at the wavelength of 220 nm to the absorbance at 275 nm in the soil leaching solution.
4 principle
The use of nitrate leachate in the soil near the wavelength of 220nm absorption and absorbance of the size and nitrate concentration
The nitrite content was quantitatively determined. Using the dissolved organic matter at 220nm and 275nm wavelength are absorbed,
While the nitrate ion at 275nm wavelength does not absorb the characteristics of the soil leaching solution at 275nm absorbance, multiplied by a school
The positive factor (f value) is used to eliminate the interference caused by the absorption of organic matter at 220 nm.
5 reagent
Unless otherwise specified, only analytical reagents shall be used in the analysis, and the water used shall comply with the requirements for Grade 3 water in GB/T 6682.
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