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JJF 1793-2020: Calibration Specification for Seawater Nutrients Analyzers
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Calibration Specification for Seawater Nutrients Analyzers
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JJF 1793-2020
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Basic data | Standard ID | JJF 1793-2020 (JJF1793-2020) | | Description (Translated English) | Calibration Specification for Seawater Nutrients Analyzers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A60 | | Classification of International Standard | 17.180 | | Word Count Estimation | 17,173 | | Date of Issue | 2020 | | Date of Implementation | 2020-04-17 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1793-2020: Calibration Specification for Seawater Nutrients Analyzers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Calibration specification for seawater nutrient measuring instrument)
National Metrology Technical Specifications of the People's Republic of China
Calibration specification for seawater nutrient salt meter
2020-01-17 released
2020-04-17 implementation
Issued by the State Administration for Market Regulation
Sea water nutrient salt meter
Calibration specification
Focal point. National Technical Committee for Marine Special Measuring Instruments
Drafting unit. National Marine Standards and Metrology Center
This specification entrusts the National Technical Committee of Marine Special Measuring Instruments to be responsible for interpretation
Drafters of this specification.
Wang Cong (National Ocean Standard Metrology Center)
Shi Chaoying (National Ocean Standard Metrology Center)
Wang Aijun (National Ocean Standard Metrology Center)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Reference documents (1)
3 Overview (1)
4 Measurement characteristics (1)
4.1 Detection limit (1)
4.2 Indication error (1)
4.3 Measurement repeatability (1)
5 Calibration conditions (1)
5.1 Calibration environmental conditions (1)
5.2 Measurement standards and other equipment (2)
6 Calibration items and calibration methods (2)
6.1 Calibration items (2)
6.2 Calibration method (2)
7 Expression of calibration results (3)
7.1 Calibration record (3)
7.2 Calibration result processing (3)
8 Recalibration interval (4)
Appendix A Calibration Record Form of Seawater Nutrient Salt Meter (5)
Appendix B The format of the inner page of the calibration certificate of the seawater nutrient salt meter (7)
Appendix C Measurement Uncertainty Evaluation Example of Calibration Results of Nutrient Salt Concentration Indication Error (8)
Introduction
This specification is based on JJF 1001-2011 "General Metrology Terms and Definitions", JJF 1059.1-2012 "Inaccurate Measurement
"Quality Evaluation and Representation" and JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications" are the basic series of specifications
Make it.
This specification combines the development and application status of seawater nutrient salt measuring instruments, and refers to HY/T 099-2007 seawater
Part of the content of the detection method of the nutrient salt meter is formulated.
This specification is released for the first time.
Calibration specification for seawater nutrient salt meter
1 Scope
This specification is applicable to the calibration of nutrient salt meters used in marine field.
2 Reference documents
This specification refers to the following documents.
HY/T 099-2007 seawater nutrient salt measuring instrument testing method
For dated reference documents, only the dated version applies to this specification; for undated references
The latest version (including all amendments) is applicable to this specification.
3 overview
The nutrients referred to in this specification are nitrate, nitrite, ammonia-nitrogen, phosphate and silicate in seawater.
Inorganic salts needed for the growth of foreign plants.
Seawater nutrient salt measuring instrument (hereinafter referred to as "measuring instrument") is used to measure the nutrient salt concentration in seawater on-site, which can
Automatic or semi-automatic injection, quantitative addition of reagents, chemical reactions and measurement. The measuring instrument mostly adopts the colorimetric method.
Measure the degree of absorption of light waves by sea water samples, and analyze the nutrient concentration of sea water samples.
4 Measurement characteristics
4.1 Detection limit
Nitrate-nitrogen should not exceed 4μg/L; nitrite-nitrogen and phosphate-phosphorus should not exceed 1μg/L; ammonia-nitrogen should not exceed
More than 3μg/L; silicate-silicon should not exceed 6μg/L.
4.2 Indication error
Relative error of indication. nitrate-nitrogen, nitrite-nitrogen, phosphate-phosphorus, silicate-silicon should not exceed the measured value
±10% of the measured value; ammonia-nitrogen should not exceed ±15% of the measured value.
When the indication value of the measuring instrument is within 10% of its measuring range, the indication error of nitrate-nitrogen and ammonia-nitrogen should not exceed
5μg/L; nitrite-nitrogen, phosphate-phosphorus, silicate-silicon should not exceed ±3μg/L.
4.3 Measurement repeatability
Nitrate-nitrogen, nitrite-nitrogen, phosphate-phosphorus, silicate-silicon and ammonia-nitrogen measurement repeatability should not be greater than 3%.
Note. All the above indicators are not used as eligibility judgments, only for reference.
5 Calibration conditions
5.1 Calibration environment conditions
Ambient temperature. (20±5)℃;
Relative humidity. 20%~80%;
Others. There is no mechanical vibration or electromagnetic interference that affects the normal operation of the measuring instrument.
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