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HJ 762-2015: Specifications and test procedures for automatic/on-line monitoring of Lead in Water
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Specifications and test procedures for automatic/on-line monitoring of Lead in Water
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HJ 762-2015
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Standard similar to HJ 762-2015 HJ 511 HJ 945.3 HJ 943 Basic data | Standard ID | HJ 762-2015 (HJ762-2015) | | Description (Translated English) | Specifications and test procedures for automatic/on-line monitoring of Lead in Water | | Sector / Industry | Environmental Protection Industry Standard | | Word Count Estimation | 15,179 | | Date of Issue | 2015-10-22 | | Date of Implementation | 2015-12-01 | | Quoted Standard | GB 4208; GB/T 7470; GB/T 7475; GB/T 13306; HJ/T 212 | | Regulation (derived from) | Ministry of Environment Announcement 2015 No.63 | | Issuing agency(ies) | Ministry of Ecology and Environment | | Summary | This Standard specifies the technical requirements of lead water quality automatic online monitor, performance indicators and detection methods. This Standard applies to lead automatic online water quality monitoring instrument production design, selection and application performance testing. Lead used in different occasions for automatic online water quality monitoring instrument (hereinafter referred to as the "Instrument"), provides for two types of instrument detection range. I type detection range of the instrument is: 0.005 ~ 0.2mg/L, it is mainly used to monitor surface water, groundwater and drinking water and the like. Type II detection range of the instrument is: 0.2 ~ 2mg/L, it is mainly used to monitor sewage and industrial waste water and the like. | HJ 762-2015: Specifications and test procedures for automatic/on-line monitoring of Lead in Water
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Specifications and test procedures for automatic/on-line monitoring of Lead in Water
National Environmental Protection Standard of the People 's Republic of China
Technical requirements and testing methods for automatic on - line monitoring of lead water quality
Specifications and Test Procedures for Automatic/On-line
Monitoring of Lead in Water
2015-10-22 released
2015-12-01 implementation
Ministry of Environmental Protection released
I directory
1 Scope of application
2 normative reference documents
3 Terms and definitions 1
4 technical requirements .2
5 performance indicators and testing methods
6 operating instructions .11
Foreword
In order to implement the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on the Prevention and Control of Water Pollution,
Automatic on-line monitoring instrument technical performance, improve the ability of China's water environment monitoring work, the development of this standard.
This standard provides the lead water quality automatic on-line monitoring instrument technical requirements and performance indicators and testing methods.
This standard is the first release.
This standard is organized by the Ministry of Environmental Protection Science and Technology Standards Division.
The main drafting unit of this standard. China Environmental Monitoring Station.
This standard is approved by the Ministry of Environmental Protection on October 22,.2015.
This standard is implemented as of December 1,.2015.
This standard is explained by the Ministry of Environmental Protection.
Technical requirements and testing methods for automatic on - line monitoring of lead water quality
1 Scope of application
This standard specifies the technical requirements, performance indicators and testing methods of lead water quality automatic on-line monitor.
This standard applies to the production of water quality automatic on-line monitor design, application selection and performance testing.
For the different applications of lead water quality automatic on-line monitor (hereinafter referred to as "instrument"), provides a two-type instrument
The detection range.
I-type instrument detection range. 0.005 ~ 0.2 mg/L, mainly used in surface water, groundwater and drinking water monitoring.
The detection range of the ІІ type instrument is 0.2 ~ 2 mg/L, which is mainly used in the monitoring of domestic sewage and industrial wastewater.
2 normative reference documents
The contents of this standard refer to the following documents or their terms. Those who do not specify the date of the reference file, the effective version of the appropriate
For this standard.
GB 4208 enclosure protection class (IP code)
GB/T 7470 Water quality - Determination of lead - Dithizone spectrophotometric method
Methods for determination of copper, zinc, lead and cadmium in water - Atomic absorption spectrophotometric method GB 7475
GB/T 13306 signs
HJ/T 212 Pollution Source Online Automatic Monitoring (Monitoring) System Data Transmission Standard
3 terms and definitions
The following terms and definitions apply to this standard.
3.1
Standard check with standard solution
The instrument measures the standard solution and determines the accuracy of the measurement results.
3.2
The lower limit of quantification
The instrument can determine the minimum concentration of the substance to be measured, subject to the indication of the indication error.
3.3
Memory effect
The degree of influence of the instrument on the next measurement after a standard solution or water sample is measured.
3.4
Standard sample
The instrument was measured before adding a certain concentration of standard solution before and after the actual water samples, calculated after adding the standard solution measured value
The percentage of the amount added relative to the theoretical addition.
3.5
Zero drift
In the absence of unplanned instrument maintenance and calibration under the premise of the required cycle to continuously measure the concentration value for the detection
2 range of the lower limit of the standard solution, the measured value of the instrument and the relative deviation between the initial value.
3.6
Range drift
In the absence of unplanned instrument maintenance and calibration under the premise of the required cycle to continuously measure the concentration value for the detection
The upper limit of the range of 80% of the standard solution, the measured value of the instrument and the relative deviation between the initial value.
3.7
Data efficient availability of data
The number of test data that meets the required test data in the minimum maintenance cycle is the percentage of all test data.
3.8
Indication error
The relative error between the measured value and the true value of the instrument.
3.9
Environmental temperature stability
The instrument measures the error of the standard solution, measured value and reference value at different ambient temperatures.
3.10
Ion interference
Instrument to add the interference of the standard solution to measure the measured value and the true value of the indication error.
3.11
Run the log
During the operation of the instrument automatically record the test conditions, fault, maintenance and other status information and daily calibration, parameter changes, etc.
Maintenance records.
3.12
Consistency conformity
The degree of parallelism of the measured values of multiple instruments under the same test conditions.
3.13
Minimum maintenance period
During the inspection process, the instrument is not subjected to any manual maintenance (including replacement of reagents, calibration equipment, etc.) until the instrument
The device can not maintain the normal measurement status or the total run time (hours) of the measurement result that does not meet the relevant requirements.
4 technical requirements
4.1 Instrument composition
The basic composition of the instrument shown in Figure 1, mainly contains the following units.
3 Figure 1 The basic components of the instrument
Injection/metering unit. including water samples, standard solution, reagents and other imported parts (water-containing channels and standard solution channels)
And metering part.
Digestion unit. the water sample lead element and its compounds into lead ion part.
Analysis unit. by the reaction module and the detection module, through the control unit to complete the automatic analysis of the material to be measured,
And converts the measured value into a portion of the electrical signal output.
Control unit. including the system control hardware and software, to achieve injection, digestion, drainage and other operations of the part.
4.2 Basic requirements
4.2.1 The instrument should mark the product nameplate in the eye-catching area, the content should include the production unit, the production date, the product number, the range
Wai, power, working conditions and other conditions, in line with GB/T 13306 requirements.
4.2.2 The display should be free of stains and damage. All display interface should be Chinese, and the characters are uniform, clear, no dark corners of the screen,
Dark spots, rainbow, bubbles, flashing and so on, according to the display prompts for the whole program operation.
4.2.3 Chassis shell should be made of corrosion-resistant materials, the surface without cracks, deformation, pollution, burrs and other phenomena, the surface coating are
Uniform, no corrosion, rust, shedding and wear.
4.2.4 product assembly should be strong, no loose parts, buttons, switches, door locks and other components flexible and reliable.
4.2.5 The main parts shall have corresponding identification or textual description.
4.2.6 should be in the instrument eye-catching location identification analysis flow chart.
4.2.7 The enclosure of the instrument shall meet the requirements of IP52 degree of protection specified in GB 4208.
4.3 Performance requirements
4.3.1 Injection/metering unit
4.3.1.1 shall be made of a material which is less resistant to corrosion and less adsorbed and shall not be affected by corrosion or adsorption of reagents or contaminants
The result is measured.
4.3.1.2 The measurement part shall ensure the accuracy of the injection of water samples, standard solutions and reagents.
4.3.2 digestion unit
4.3.2.1 should be used high temperature, high pressure, ultraviolet and other digestion, water samples can lead all the elements and their compounds all converted
For lead ions.
4.3.2.2 should be used anti-corrosion high temperature materials, and easy to clean.
4.3.2.3 should have automatic heating device and temperature sensor, you can set the digestion time and temperature.
4.3.2.4 should have a cooling device and safety protection device, can maintain constant temperature or constant pressure.
44.3.3 Analysis unit
4.3.3.1 The reaction module shall be constructed of corrosion-resistant material and shall be easily cleaned.
4.3.3.2 The output signal of the detection module should be stable.
4.3.4 Control unit
4.3.4.1 should have abnormal information (over-range alarm, lack of reagent alarm, component failure alarm, excessive alarm, etc.) feedback
Function, should use sound and light, etc. alarm.
4.3.4.2 should have the automatic cleaning function for units such as injection/metering, digestion and analysis.
4.3.4.3 In the event of an accidental power re-energization should be automatically discharged before the power is measured under the measured substances and reagents, automatic
Wash each channel and reset to the state of restarting the measurement. If the power before the heat in the digestion state, re-power after the automatic
Cooled and reset to the state of restarting the measurement.
4.3.4.4 data processing system should have data and run log collection, storage, processing, display and output functions, should
Can store at least 12 months of raw data and run the log, and have two operations management authority, the general operator can only check
Ask the corresponding log and instrument settings parameters.
4.3.4.5 Instrument data in mg/L or μg/L, and have mg/L and μg/L units of mutual conversion function.
4.3.4.6 should have automatic standard verification and automatic calibration function, when the automatic standard verification is not passed when the automatic calibration,
And the results into the log.
4.3.4.7 should have the daily calibration, parameter changes automatically record, save and query functions.
4.3.4.8 should have the function of high and low range automatic switching, the range switch does not affect the monitoring data of the normal display and signal
The normal output. Type I instruments have a low range of 0.005 to 0.2 mg/L and a high range of 0.2 to 0.4 mg/L; a low range of the ІІ
0.2 ~ 2 mg/L, high range of 2 ~ 4 mg/L.
4.3.4.9 should have to add maintenance identification of different test data, such as manual maintenance. M; failure. D; check. C; standard
Verification. SC.
4.3.4.10 The control unit shall provide the communication protocol when implementing the above functions and meet the requirements of HJ/T 212.
4.3.4.11 should have a digital communication interface, through the digital communication interface output data and the relevant log, and can access
Receive remote control instructions.
4.4 Safety requirements
4.4.1 The insulation resistance between the power supply lead and the enclosure shall be not less than 20MΩ.
4.4.2 should be equipped with leakage protection devices and overload protection devices to prevent personal shock and accidentally burned the instrument.
4.4.3 should have a good grounding port.
4.4.4 high temperature, high pressure, corrosion, toxic and harmful and other dangerous parts should have a warning sign.
5 performance indicators and testing methods
5.1 Performance indicators
5.1.1 Indication error
Type I instrument for the two standard solutions were measured 6 times, each standard solution 6 times the average value of the measured value relative to the true value
The maximum relative error should be within ± 10%. The maximum relative error of the ІІ type instrument according to the detection method of type I instrument should be
Within ± 5%.
5.1.2 Lower limit of quantification
5I type instrument should be less than the minimum limit of ≤ 0.005mg/L, І І instrument quantitative limit should be ≤ 0.2 mg/L.
5.1.3 precision
Type I and ІІ instruments for continuous determination of the standard solution 6 times the relative standard deviation of the measured results should be ≤ 5%.
5.1.4 Zero drift
Type I and ІІ instruments continuously measure the concentration of the standard solution for the lower limit of the detection range, continuous measurement in cycles of 1 hour
Hour, the maximum variation between the measured result and the initial value should be within ± 5% of the upper limit of the detection range.
5.1.5 Range drift
Type I and ІІ instruments continuously measure the concentration of 80% of the upper limit of the detection range of the standard solution to 1 hour for the cycle of continuous measurement
The maximum variation between the measured result and the initial value should be within ± 10% of the upper limit of the detection range.
5.1.6 Voltage stability
I and ІІ type of equipment after the normal operation, the supply voltage were 220V, 198V, 242V were measured under the conditions of concentration
For the detection range of 20% of the upper limit of the standard solution, 198V, 242V under the conditions of the measured value relative to the power supply voltage of 220V conditions
The maximum relative error of the measured value should be within ± 5%.
5.1.7 Ambient temperature stability
Type I and ІІ instruments were followed by waiting for 3 hours at 20 ° C, 5 ° C, 20 ° C, 40 ° C, 20 ° C ambient temperature.
Concentration value for the detection range of the upper limit of 20% and 80% of the standard solution, the measured value of 20 ℃ relative to the three measured values of the average
The maximum relative error should be within ± 10%.
5.1.8 Ion interference
Type I and ІІ instruments were measured with a single interference ion mixed solution, the measurement results of the indication error should be ± 30%
Inside.
5.1.9 Memory effect
Type I and ІІ instruments in turn measure the concentration of the upper limit of 20%, 80%, 20% of the standard solution, the measurement results
The maximum indication error should be within ± 10%.
5.1.10 standard sample to join the test
The instrument has to measure the actual water samples and add a certain standard solution of the actual water samples, type I instrument samples into the test recovery rate
Circumference should be 80% to 120%, І І instrument sample to join the test recovery rate should be 75% to 125%.
5.1.11 Actual water sample ratio detection
I type instrument measured the actual water sample concentration ≤ 0.050mg/L, the actual water sample ratio of the test results should be ± 0.010mg/L to
When the measured actual water sample concentration > 0.050mg/L, the results of the test should be ≤ 15%. The actual water sample ratio of the ІІ type instrument
The result of the test should be ≤15%.
5.1.12 Consistency
I and І І instrument test data consistency should be ≤ 10%.
5.1.13 Minimum maintenance cycle and data efficiency
Type I equipment minimum maintenance cycle should be ≥ 168 hours, І І instrument minimum maintenance cycle should be ≥ 168 hours, during the type I and ІІ type
Instrument data efficiency should be ≥ 90%.
Table 1 Lead water quality automatic on-line monitor performance indicators
Performance type I type ІІ type
Indication error ± 10% ± 5%
Quantitative lower limit ≤0.005mg/L ≤0.2mg/L
6 precision ≤ 5% ≤ 5%
Zero drift ± 5% ± 5%
Range drift ± 10% ± 10%
Voltage stability ± 5% ± 5%
Ambient temperature stability ± 10% ± 10%
Ion interference ± 30% ± 30%
Memory effect ± 10% ± 10%
Standard sample to join the test 80% to 120% 75% to 125%
Actual water sample versus detection
When the actual water concentration is ≤0.050mg/L,
The error within ± 0.010mg/L or less;
Actual water sample concentration > 0.050mg/L, the ratio
The relative error of detection ≤ 15%
≤15%
Data efficiency ≥ 90% ≥90%
Consistency ≤10% ≤10%
Minimum maintenance cycle ≥168 hours ≥168 hours
5.2 Detection conditions
5.2.1 Ambient temperature (5 ~ 40) ℃
5.2.2 Relative humidity (65 ± 20)%
5.2.3 Supply voltage AC voltage (220 ± 22) V
5.2.4 Power supply frequency (50 ± 0.5) Hz
5.2.5 Water temperature (0 ~ 50) ℃
5.2.6 pH of water samples pH 6 ~ 9
5.2.7 Water sample suspended matter 50mg/L or less
5.3 Reagents
5.3.1 Experimental water. lead-free distilled water.
5.3.2 lead standard stock solution. ρ = 1000.0mg/L
Accurately weighed by dilute acid cleaning and drying of 0.5000g spectrum of pure metal lead, with 50mL (1 1) nitric acid dissolved, if necessary
Heated until dissolved completely, diluted with water (5.3.1) to 500.0 mL, and mixed.
5.3.3 Calibration liquid. Prepared according to the instruction manual.
5.3.4 Remaining reagents. Prepared according to the instrument specifications.
5.4 Preparation and correction of experiments
5.4.1 Connect the power supply to the normal operation according to the warm-up time specified in the instrument manual.
5.4.2 Verification of the instrument with calibration fluid, as specified in the instrument manual.
5.5 Detection method
5.5.1 Indication error
The instrument is the concentration of the detection range of the upper limit of 20%, 50% of the standard solution for continuous measurement 6 times, calculate each standard
The relative error of the average value of the six measurements of the solution and the known standard solution concentration, the larger the relative error value of the two standard solutions
Value as the decision value of the indication error.
The relative error of the standard solution is calculated by the formula (1).
7 0
CxRe (1)
Where.
Re - the relative error of the standard solution,%;
X - the average of the measured values of the standard solution;
C - the concentration of the standard solution.
5.5.2 Quantitative lower limit
The instrument in the same conditions to continuously measure the concentration value for the lower limit of the detection range of the standard solution 7 times, calculate the seven measured values
Of the standard deviation S, the standard deviation of 10 times the instrument for the lower limit of quantification. Calculation methods see equations (2) and (3).
2
S xx
N
(2)
SLOQ 10 (3)
Where.
S - 7 times the standard deviation of the measured value;
N - number of measurements;
Ix - the i-th measured value;
X - the average of the standard solution measurements.
LOQ - Quantitative lower limit.
5.5.3 precision
The instrument measures the concentration of 50% of the upper limit of the detection range of the standard solution, continuous measurement 6 times, calculate the relative value of 6 times the measured value
Standard deviation, the relative standard deviation as the precision of the determination of the value. Calculation method see formula (4).
00% 1
-
Xx
(4)
Where.
RS - the precision of the instrument;
X - the average of the standard solution measurements.
N - the number of measurements;
Ix - the i-th measured value.
5.5.4 Zero drift
Using the concentration value for the detection range of the lower limit of the standard solution to 1 hour for the cycle, continuous measurement 24 hours, take the first three times
The average value of the measured values is the initial measured value, and the maximum variation range of the subsequent measured value and the initial measured value is calculated relative to the detection range
The relative deviation of the upper limit. Calculate the formula (5) and (6).
Number of data. x1, x2, x3x24 a total of 24.
|| ΔZ Ci i distance x (5)
8100%
ΔZ
ZD max (6)
Where.
I? Z - the absolute error of the i-th measured value relative to the standard solution concentration value;
Ix - the i-th measured value;
C - the initial value of the standard solution;
ZD - zero drift of the instrument;
ΔZmax - the maximum value of the absolute value of the measured value relative to the standard solution concentration value;
A - the upper limit of the detection range.
5.5.5 Range drift
Using the concentration of 80% of the upper limit of the detection range of the standard solution to 1 hour for the cycle, continuous measurement of 24 hours, before the front
The average value of the three measured values is the initial measured value, and the maximum variation of the subsequent measured value and the initial measured value is calculated
The relative deviation of the upper limit of the range. Calculate the formula (7) and (8).
Number of data. x1, x2, x3x24 a total of 24.
|| ΔZ Ci i distance x (7)
100% ΔZ
RD max (8)
Where.
I? Z - the absolute error of the i-th measured value relative to the standard solution concentration value;
ΔZmax - the maximum value of the absolute value of the measured value relative to the standard solution concentration value;
A - the upper limit of the detection range;
Ix - the i-th measured value;
C - the initial value of the standard solution;
RD - the range drift of the instrument.
5.5.6 Voltage stability
Using the concentration value of the upper limit of the detection range of 20% of the standard solution, the instrument at the initial voltage of 220V continuous test three
Times, the average value of the three measurements is the initial value; adjust the voltage to 242V, the same standard solution three times; adjust the voltage to
198V, the same standard solution was measured three times, according to the formula (9) to calculate the ...
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