HJ 101-2019 (HJ101-2019)

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HJ 101-2019: PDF in English
HJ/T 101-2019
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HJ/T 101-2003
Technical specifications and test procedures for water
quality on-line automatic monitoring equipment of
ammonia
ISSUED ON: DECEMBER 24, 2019
IMPLEMENTED ON: MARCH 24, 2020
Issued by: Ministry of Ecology and Environment
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Technical specifications ... 9
5 Performance indexes and test methods ... 13
6 Operating manual ... 22
Technical specifications and test procedures for water
quality on-line automatic monitoring equipment of
ammonia
1 Scope
This Standard specifies the technical specifications, performance indexes and test
methods for water quality on-line automatic monitoring equipment of ammonia.
This Standard applies to guiding production and design, guiding to application type-
selection and implementing performance test.
The measuring range of water quality on-line automatic monitoring equipment of
ammonia shall include 0.1 mg/L ~ 150 mg/L, which can satisfy the monitoring
requirements for underground water, surface water, domestic wastewater and
industrial wastewater.
2 Normative references
This Standard referenced the following documents or clauses therein. For undated
references, the latest edition of the referenced documents (including all amendments)
applies to this document.
GB/T 9969, General principles for preparation of instructions for use of industrial
products
GB/T 13306, Plate
HJ 212, Data transmission standard for online monitoring systems of pollutant
HJ 535, Water quality – Determination of ammonia nitrogen – Nessler reagent
spectrophotometry
HJ 536, Water quality-Determination of ammonia nitrogen – Salicylic acid
spectrophotometry
expressed as relative standard deviation, provided that no unplanned artificial
maintenance and correction is carried out for instruments.
3.7
low level drift in 24 h
The mean value of the deviation absolute value between measured value and initial
value of instruments for the continuous measurement (0 ~ 20%) of upper limit of the
test range of a low concentration reference solution at specified periods, provided that
no unplanned artificial maintenance and correction is carried out for instruments.
3.8
high level drift in 24 h
The percentage of the mean value, in relation to the upper limit of the test range (80%
~ 100%), of the deviation absolute value between measured value and initial value of
instruments for the continuous measurement (0 ~ 20%) of upper limit of the test range
of a high concentration reference solution at specified periods, provided that no
unplanned artificial maintenance and correction is carried out for instruments.
3.9
memory effect
The degree of interference of the residues in the tubes of instruments on the next result
of measurement after the measurement of some reference solution or sample using
instruments.
3.10
interference of voltage
The deviations of measured values, which are obtained in the measurement of the
same reference solution using instruments under different supply voltages, from
measured value under reference voltage (220 V).
3.11
interference of pH
The deviation of measured values, which are obtained from the measurement of a
reference solution using instruments under different pH values, from measured value
from the measurement of a neutral reference solution (pH = 7).
3.12
management, data and running log query and output, and so on; meanwhile, they have
such functions as sample reservation triggering sampling. Control units are capable of
providing corresponding communication protocols when performing the above-
mentioned functions, and such communication protocols satisfy the requirements of
HJ 212.
4.2 Environmental conditions for service
Environmental temperature: 5°C ~ 40°C;
Relative humidity: 65% ± 20%;
Supply voltage: alternating voltage 220 V ± 22V;
Supply frequency: 50 Hz ± 0.5 Hz;
Water sample temperature: 0°C ~ 50°C.
4.3 Appearance requirements
4.3.1 The marking of instruments shall be as specified in GB/T 13306. Plates shall be
affixed to an appropriate, visible position. Plates shall include the following content:
a) category of power supply;
b) name and address of manufacturer;
c) name and specifications of instruments;
d) factory number;
e) manufacturing date;
f) test range and limit of quantitation;
g) limit of quantitation;
h) environmental conditions for service.
4.3.2 The monitor shall be free from stains and damages. All display interfaces shall
be in Chinese and the characters uniform and clear; the screen shall be free from dark
corners, black spots, rainbows, bubbles, flickers, etc.; it is capable of finishing all
operations according to the instructions of the monitor.
4.3.3 The enclosure shall be made of corrosion resistant materials; the surface shall
be free from crack, deformation, contamination, burr, etc.; the coating of the surface
shall be uniform, without corrosion, rust, shedding or abrasion.
4.4.4.2 The output signals of test modules shall be stable.
4.4.4.3 Signal converters shall have the function to convert measured values into a
corresponding quantity of electric signals (4 mA ~ 20 mA DC or RS232/RS485
interfaces).
4.4.4.4 The test period shall not be greater than 60 min.
4.4.5 Control units
4.4.5.1 They shall have the timed test function.
4.4.5.2 They shall have the manual and automatic cleaning function for the units
including sample introduction/measurement, physical/chemical pretreatment and
analysis and test.
4.4.5.3 They shall have the manual and automatic correction function; they are capable
of setting automatic correction period.
4.4.5.4 They shall have the automatic reference sample inspection function.
4.4.5.5 If they have multiple measuring ranges, they shall have the automatic
measuring range switching function; instruments display the final results of
measurement.
4.4.5.6 They shall be capable of automatic acquisition, storage, processing, query,
display, output, etc. of all data, instruments’ parameters and running logs.
4.4.5.7 They shall store initial data and running logs for at least 12 months.
4.4.5.8 They shall have the function to add marks for different test data; the specific
marks shall be as specified in HJ 212.
4.4.5.9 The unit of measured results of instruments shall be mg/L, which shall be
rounded off to the second decimal place.
4.4.5.10 They shall have the digital quantity communication interfaces; output
instructions, relevant data and running logs through the digital quantity communication
interfaces; can receive the remote control instructions of the platform, at least including
remote start, remote time setting function.
4.4.5.11 Data transmission shall be accompanied by communication protocols, as
specified in HJ 212.
4.4.5.12 They shall realize the serial port output and internet access output of
monitored data.
of ammonia standard stock solution.
5.3.3 Other reagents: to be provided by the manufacturer of instruments.
5.4 Test preparation and correction
5.4.1 Check all parts of instruments; adjust instruments to the normal working condition.
5.4.2 Check all reagents of instruments; ensure they are sufficient and that their quality
is as specified.
5.4.3 After switching on, preheat in accordance with the preheating time specified in
the operating manual provided by the manufacturer of instruments, making all parts
function stably.
5.4.4 In accordance with the correction method specified in the operating manual
provided by the manufacturer of instruments, use ammonia standard stock solution
(5.3.2) to prepare standard solution of the concentration specified for instruments.
5.5 Test method for basic test range
5.5.1 Indication error
During the normal running period of instruments, test three standard solutions of
ammonia concentrations about 2 mg/L, 5 mg/L and 8 mg/L; test each solution
consecutively for n (n = 6) times; calculate the relative error of the mean value of the
n (n = 6) measured values in relation to the concentration of standard solution.
Calculate the indication error Re for each time.
where, Re – the indication error, in %;
x – the mean value of n measurements for each concentration, in mg/L;
ρ – the concentration of ammonia standard solution, in mg/L.
5.5.2 Limit of quantitation
During the normal operating period of instruments, test standard solution of ammonia
concentration about 0.1 mg/L for n (n = 7) times; in accordance with Equation (1),
calculate the indication error Re of n (n = 7) measured values; in accordance with
Equation (2), calculate the standard deviation S of the n (n = 7) measured values; in
accordance with Equation (3), calculate the limit of quantitation of instruments LOQ.
where, T – the memory effect, in mg/L;
Xi – the measured value of the ith measurement, in mg/L.
5.5.7 Interference of voltage test
During the normal operating period of instruments, use standard solution of ammonia
concentration about 8 mg/L to carry out measurement for 3 times under the initial
voltage 220 V; adjust the voltage to 242 V and measure the same standard solution
for 3 times; adjust the voltage once again to 198 V and measure the same standard
solution for 3 times. Use the mean value of 3 measured values under 220 V; in
accordance with Equation (8), calculate respectively the relative error ΔV of the mean
value Vi of 3 measured values under 242 V and 198 V, in relation to Vs; use the larger
absolute value as the value of interference of voltage test.
where, ΔV – the interference of voltage, in %;
Vi – the mean value of 3 measured values under some voltage, in mg/L;
Vs – the mean value of 3 measurements under 220 V, mg/L.
5.5.8 Interference of pH test
During the normal operating period of instruments, use standard solution of ammonia
concentration about 5 mg/L; adjust the pH value of standard solution to 4 and 9; use
instruments to measure respectively the original standard solution, the standard
solution of pH 4 and the standard solution of pH 9, for 3 times. Use the mean value of
3 measured values of the original standard solution as As; in accordance with Equation
(9), calculate interference of pH ΔA under different pH conditions; take the largest
absolute value as the value of interference of pH test.
where, ΔA – the interference of pH, in %;
Ai – the mean value of 3 measured values under some pH condition;
As – the mean value of 3 measurements of the original standard solution.
5.5.9 Interference of environmental temperature test
where, A – the mean value of the relative error’s absolute value of the water samples,
in %;
a – the mean value of the absolute error’s absolute value of the water samples,
in mg/L;
Xi – the value of the water samples measured for the ith time using water quality
on-line automatic monitoring equipment of ammonia, in mg/L;
B – the mean value of the water samples using the manual method, in mg/L;
n – the number of measurements of the water samples using water quality on-
line automatic monitoring equipment of ammonia;
i – the ith time using water quality on-line automatic monitoring equipment of
ammonia to measure the water sample.
5.5.11 Minimum period between maintenance periods
During the whole test period of instruments, the interval between any two maintenance
operations of instruments (including dumping waste liquids, adding reagents, changing
measuring ranges and other repairs and maintenance) shall be ≥ 168 h.
5.5.12 Data availability
During the whole test period of the basic test range, the data available is as follows:
a) when instruments are used to carry out the test of the items specified in this
Standard (excluding the interference of environmental temperature), the
indicated values for the performance of measurements shall satisfy the
requirements for all indexes of Table 1 in this Standard (excluding the data
availability indexes);
b) when instruments are used to carry out the test beyond the items specified in this
Standard, instruments shall be used to measure the standard solution of some
certain concentration. The measured values shall satisfy the requirement that
the indication error is within the range of ± 10%.
Those, which fail to satisfy the above-mentioned clauses or lacks data, are invalid
values. The percentage of the size of actual data available (excluding the interference
of environmental temperature), in relation to the size of all data (excluding the
interference of environmental temperature) which shall be obtained during the test
period, is the data availability. For calculation method, see Equation (13).
......
(Above excerpt was released on 2020-02-09, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/HJ101-2019