JJG 1094-2013 PDF in English
JJG 1094-2013 (JJG1094-2013) PDF English
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Water Quality On-line Analyzers of Total Phosphorus and Total Nitrogen
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Standards related to (historical): JJG 1094-2013
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JJG 1094-2013: PDF in English JJG 1094-2012
JJG
National Metrological Verification Regulation
of the People's Republic of China
Water Quality On-line Analyzers
of Total Phosphorus and Total Nitrogen
ISSUED ON. NOVEMBER 28, 2013
IMPLEMENTED ON. FEBRUARY 28, 2014
Issued by. State Administration of Quality Supervision, Inspection and
Quarantine
National Metrological Verification Regulation
of the People's Republic of China
Water Quality On-line Analyzers
of Total Phosphorus and Total Nitrogen
Jurisdiction organization. National Technical Committee on Environment
Stoichiometry
Main drafting organization. Zhejiang Province Institute of Metrology
Participating drafting
organizations.
Focused Photonics (Hangzhou) Co, Ltd.
Zhejiang Province Environmental Monitoring Center
This Regulation is entrusted to National Technical Committee on Environment
Stoichiometry for interpretation.
Main drafters of this Regulation.
Lin Zhen (Zhejiang Province Institute of Metrology)
Zhang Xiao (Zhejiang Province Institute of Metrology)
Participating drafters.
Wang Jing (Focused Photonics (Hangzhou) Co, Ltd.
Xu Yuanyuan (Zhejiang Province Institute of Metrology)
Fu Jun (Zhejiang Province Environmental Monitoring Center)
Table of Contents
Introduction ... 5
1 Scope ... 6
2 Overview ... 6
3 Metrological performance requirements ... 6
4 General technical requirements ... 7
4.1 Appearance and power-on inspection ... 7
4.2 Safety requirements ... 7
5 Measuring instrument control ... 8
5.1 Verification conditions ... 8
5.2 Verification items ... 8
5.3 Verification method ... 9
5.4 Verification results processing ... 11
5.5 Verification cycle ... 11
Annex A ... 12
Annex B ... 13
Annex C ... 15
Introduction
This Regulation is developed in accordance with the provisions in JJF 1002-2010 “The
Rules for Drafting National Metrological Verification Regulation”, JJF 1001-2011 “General
Terms in Metrology and Their Definitions” and JJF 1059.1-2012 “ Evaluation and
Expression of Uncertainty in Measurement”.
Technical indicators of this Regulation refer to relevant contents of HJ/T 102-2003 “The
technical requirement for water quality automatic analyzer of total nitrogen” and HJ/T
103-2003 “The technical requirement for water quality automatic analyzer of total
phosphorous”.
This Regulation is developed for the first time.
Verification Regulation of Water Quality On-line
Analyzers of Total Phosphorus and Total Nitrogen
1 Scope
This Regulation applies to initial verification, follow-up verification and in-use inspection of
water quality on-line analyzers of total phosphorus and total nitrogen.
2 Overview
The instruments are divided into instruments for separate measurement of total
phosphorus or total nitrogen AND integrated measuring instruments of total phosphorus
and total nitrogen. They are used to automatically and continuously measure total
phosphorus concentration and total nitrogen concentration in surface water, domestic
sewage, industrial waste water and other water bodies.
Total phosphorus measurement adopts ammonium molybdate spectrophotometric
method; it uses oxidizing agent to turn phosphorus and oxygen contained in water INTO
orthophosphate, which generates blue complex after reaction with color developing agent.
The total phosphorus content can be obtained through measuring the absorbance value
at a specific wave length.
Total nitrogen measurement mainly adopts alkaline potassium digestion UV spectrometry
and hydrazine sulfate reduction visible spectrophotometry. The former uses oxidizing
agent to turn nitrogen compounds in water INTO nitrate; the total nitrogen content can be
obtained through measuring absorbance value at a specific wavelength. The latter firstly
oxidizes nitrogen-containing compound, then reverts to nitrite for color reaction. The total
nitrogen content can be obtained through measuring absorbance value at a specific
wavelength. In addition, total nitrogen measurement may also adopt chemiluminescence
method or other methods.
The instrument is mainly composed of sampling system, aqueous sample treatment
system, detection system and data acquisition, processing and transmission system, etc.
3 Metrological performance requirements
Metrological performance requirements of the instrument are shown in Table 1.
Where,
- Instrument repeatability;
- Measured value of instrument for each time, mg/L;
- Average value of 6 measurements, mg/L;
n - Number of measurements, n= 6.
5.3.5 Stability
After instrument calibration, use 50% measuring range standard solution to measure;
record initial measured value; then measure once per hour; measure for 24 h continuously;
record the instrument measured values; calculate stability of the instrument based on
Formula (4).
Where,
- Instrument stability;
- Measured value per hour, mg/L;
- Initial measured value, mg/L.
5.3.6 Safety performance
5.3.6.1 Insulation resistance
Power plug is not connected to power grid; power switch is at on-position; use insulation
resistance meter to apply 500 V DC test voltage between power incoming line and
enclosure; measure insulation resistance after being stabilized for 5 s.
5.3.6.2 Dielectric strength
Power plug is not connected to power grid; power switch of instrument is at on-position;
apply test voltage between power incoming line and enclosure through withstanding
voltage tester; test voltage gradually rises to 1.5 kV; maintains for 1 min to observe
whether there is flashover and breakdown phenomena; then gradually drop to zero.
5.3.6.3 Leakage current
Power plug is connected to power grid; power switch is at on-position; leakage current
tester is connected to between instrument enclosure and power incoming line. Adjust the
voltage of leakage current tester to 242 V and measure once; change power polarity and
Annex A
Preparation of standard solution
A.1 Zero calibration solution of total phosphorus
Use distilled water or pure water that meets analysis laboratory Grade 2 water
requirements.
A.2 Zero calibration solution of total nitrogen
Zero calibration solution of total nitrogen shall be non-ammonia water, which is prepared
through one of following methods.
a) Ion exchange method. Make distilled water to pass through strong acid cation
exchange resin (hydrogen form) column; the effluent is collected in a glass bottle
sealed with glass lid.
b) Distillation method. Add 0.1mL of sulfuric acid (A. R. ρ= 1.84 g/mL) into 1 000 mL of
distilled water. Redistill it at all-glass distiller; discard the initial 50 mL of distillate;
the remaining distillate is collected in a glass bottle sealed with glass lid.
A.3 Preparation of total phosphorus standard solution
Prepare standard solution of total phosphorus for verification based on concentration of
standard solution of total phosphorus for verification in accordance with concentration of
standard solution of total phosphorus for verification, amount and concentration of
standard solution of total phosphorus in water. For example, accurately pipette 20 mL of
total phosphorus constituent analysis standard solution of which the mass concentration is
500 mg/L; place in a 1 000 mL volumetric flask; use A.1 total phosphorus zero calibration
solution to dilute to the mark; set the volume and shake well. That is the 1 L of total
phosphorus standard solution of which the mass concentration is 10.0 mg/L. Standard
solution of total phosphorus shall be prepared when it is needed.
A.4 Preparation of total nitrogen standard solution
Prepare the standard solution of total nitrogen for verification based on concentration of
standard solution of total nitrogen for verification in accordance with concentration of
standard solution of total nitrogen for verification, amount and the concentration of
standard solution of total nitrogen in water. For example, accurately pipette 20 mL of total
nitrogen constituent analysis standard solution of which the mass concentration is 500
mg/L; place in a 1 000 mL volumetric flask; use A.1 total nitrogen zero calibration solution
to dilute to the mark; set the volume and shake well; That is the 1 L of standard solution of
total nitro...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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