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HJ 609-2019: Technical specifications and test procedures for water quality on-line automatic monitoring equipment of chromium (VI)
Status: Valid HJ 609: Evolution and historical versions
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Technical specifications and test procedures for water quality on-line automatic monitoring equipment of chromium (VI)
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HJ 609-2019
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| HJ 609-2011 | English | 120 |
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The Technical Requirement for water Quality Automatic On-line Monitor of Chromium(VI)
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HJ 609-2011
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PDF similar to HJ 609-2019
Standard similar to HJ 609-2019 GB 5085.7 GB 5085.1 HJ 600 HJ 601 HJ 599 Basic data | Standard ID | HJ 609-2019 (HJ609-2019) | | Description (Translated English) | Technical specifications and test procedures for water quality on-line automatic monitoring equipment of chromium (VI) | | Sector / Industry | Environmental Protection Industry Standard | | Classification of Chinese Standard | Z16 | | Classification of International Standard | 13.060 | | Word Count Estimation | 15,122 | | Date of Issue | 2019 | | Date of Implementation | 2020-03-24 | | Issuing agency(ies) | Ministry of Ecology and Environment | HJ 609-2019: Technical specifications and test procedures for water quality on-line automatic monitoring equipment of chromium (VI)
---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.
n
(2)
SLOQ 10 (3)
In the formula. S--7 standard deviation of measured value, mg/L;
n--number of measurements;
ix-the i-th measured value, mg/L;
x--average value of standard solution measurement, mg/L;
LOQ--lower limit of quantification, mg/L.
5.5.3 Precision
The instrument measures a standard solution with a concentration value of 50% of the upper limit of the detection range. It measures 6 times continuously and calculates the phase of the 6 measured values.
Regarding the standard deviation, the relative standard deviation is used as the determination value of precision. The calculation method is shown in formula (4).
7
00% 1
xx
(4)
In the formula. Sr-precision of the instrument,%;
n--number of measurements;
ix-the i-th measured value, mg/L;
x--The average value of the measured value of the standard solution, mg/L.
5.5.4 Zero drift
A standard solution with a concentration value of the lower limit of the detection range is used for continuous measurement for 24 hours. The average value of the previous three measurements is
Initial measurement value, calculate the percentage of the maximum change between the subsequent measurement value and the initial measurement value with respect to the upper limit of the detection range
rate. The calculation method is shown in formulas (5) and (6).
Number of data. a total of 24 x1, x2, x3x24.
I i iZ x C (5)
100%
ΔZ
ZD max (6)
In the formula. iZ-absolute error of the i-th measured value relative to the standard solution concentration value, mg/L;
ix-the i-th measured value, mg/L;
C-initial measured value of standard solution, mg/L;
ZD-zero drift of the instrument,%;
maxZ-the maximum value of the absolute error of the i-th measured value relative to the standard solution concentration value, mg/L;
A--Upper limit of detection range, mg/L.
5.5.5 Span Drift
A standard solution with a concentration value of 80% of the upper limit of the detection range is used for continuous measurement for 24 hours, and the average of the previous three measurements is taken.
Is the initial measurement value, and calculates the percentage of the maximum change between the subsequent measurement value and the initial measurement value with respect to the upper limit of the detection range
rate. The calculation method is shown in formulas (7) and (8).
(9)
In the formula. V-relative error caused by voltage change,%;
X-average value of 3 measurements under the working voltage of 242 V, mg/L;
W-the average value of 3 measurements under the initial voltage of 220 V, mg/L;
Y--The average value of 3 measurements under the working voltage of 198 V, mg/L.
5.5.7 Ambient temperature stability
Place the instrument in a constant temperature room and measure a standard solution with a concentration value of 80% of the upper limit of the detection range.
Measurement results after 5 h at 5 ° C, 20 ° C, 40 ° C, and 20 ° C for 3 h. 3 times of measured value at 20 ℃
The average value is a reference value, and the relative error between the first measurement value and the reference value under the conditions of 5 ° C and 40 ° C is calculated according to formula (10).
Difference, take the maximum value of relative error as the judgment value of the stability of the instrument's ambient temperature. See calculation formula (10).
1 100%
t X XW
And 2 100%
t X XW
(10)
Where. tW-environmental temperature stability,%;
The first measurement value at 1X --5 ℃, mg/L;
X-the average value of three measurements at 20 ° C, mg/L;
2X-the first measurement under 40 ℃, mg/L.
5.5.8 Ion interference
Mix the interference ions specified in Table 2 into mixed interference ions and add them to the standard solution. After adding, in the mixed solution
The concentration of interfering ions should meet the requirements of Table 2. The concentration of hexavalent chromium ions is 50% of the upper limit of the detection range. Instrument continuous measurement
Measure the hexavalent chromium ion concentration of the mixed solution three times, calculate the indication error of the three measurements, and take the maximum value of the indication error as
It is the judgment value of instrument ion interference.
100% is
DD
(11)
In the formula. D-ion interference,%;
iD-Mean value of 3 measurements of standard solution containing interfering ions, mg/L;
sD-concentration value of standard solution, mg/L.
9 Table 2 Interfering ions and their concentrations
Interfering ion concentration (mg/L)
Trivalent chromium 3.0
Total nickel 2.0
Total cadmium 0.2
Total lead 2.0
Total copper 4.0
Total zinc 10.0
Trivalent iron 10.0
Total aluminum 10.0
Total Manganese 10.0
5.5.9 Memory Effect
After the instrument continuously measures the standard solution whose concentration value is 20% of the upper limit of the detection range 3 times (the test results are not evaluated), and then
Measure the standard solutions with concentration values of 80% and 20% of the upper limit of the detection range three times each, and calculate the two standard solutions.
The indication error T of the measured value at one time, the larger value of the indication error is taken as the judgment value of the memory effect of the instrument.
100%
x C
(12)
twenty two
100%
x C
(13)
Where. T-memory effect;
The first measurement value of 1x --20% standard solution, mg/L;
Concentration value of 1C-20% standard solution, mg/L;
2x --20% standard solution first measurement value, mg/L;
Concentration value of 2C --80% standard solution, mg/L.
5.5.10 Comparison of actual water samples
Choose three kinds of actual water samples, whose concentrations range from low to high, and basically cover the detection range of the instrument, using the instrument and the national environment, respectively.
Monitoring and analysis method standard (GB 7467 or HJ 908) for measurement, each water sample should be measured no less than 15 times by instrument,
The number of measurements using the national environmental monitoring and analysis method should be no less than three, and each actual water sample measurement should be calculated at different concentration intervals.
The absolute value of the absolute value or the absolute value of the relative error between the fixed value and the average value of the national environmental monitoring analysis method
The average value is used to determine the detection error of the actual water sample comparison of the instrument. The calculation method is shown in formulas (14) and (15).
x B
| |
(14)
x B
nB
| |
100%
(15)
In the formula. A-the average of the absolute value of the error of the actual water sample or the average of the absolute value of the relative error, mg/L or%;
ix-the i-th measured value, mg/L;
B--The average value of the water sample measured by the national environmental monitoring analysis method standard, mg/L;
n--the number of times that each water sample is measured by an instrument.
5.5.11 Minimum maintenance intervals and data efficiency
The instrument performs continuous measurement on the water sample, timing from the start of the measurement, and does not perform any manual labor on the instrument during the measurement.
Maintenance (including replacing reagents, calibrating instruments, repairing instruments, etc.) until the instrument fails to maintain a normal measurement state or continues 3
The relative error of the two measurements exceeds ± 10%, and the total running time (h) recorded is the minimum maintenance interval of the instrument. During this period
The data efficiency of the instrument should reach more than 90%, and the data validity rate is the ratio of the number of valid data to the number of all data.
The calculation method is shown in formula (16).
0
D (16)
In the formula. D--effective data rate,%;
eD-number of valid data;
tD-the number of all data.
5.5.12 Consistency Deviation
The instrument continuously measures water samples and obtains at least 168 sets of data. The data obtained from three instruments of the same model are extracted.
Ci, j (where i is the instrument number and j is the period number), calculate the phase of the test data of the three instruments in the jth period according to formula (17)
For the standard deviation CMj, the consistency deviation CM of the data is calculated according to formula (18).
,,
100%
tt
ijij
jt
ij
CC
tt
CM
(17)
2
CM
CM
(18)
In the formula. jCM-the relative standard deviation of the test data of three instruments in the j-th period,%;
t--the number of instruments;
, i jC-data for the j period of the i-th instrument, i jC, where i = 1, 2, 3, j = 1, 2, 3 ,, mg/L
CM-consistency deviation,%;
m--the number of data sets of the instrument.
Note. when
When jCM > 10%, CM > 10%.
6 Random data
The random information such as the instrument manual should include at least the following. instrument principle, instrument structure diagram, test flow chart,
Site installation conditions and methods, instrument operation methods, component identification and precautions, toxic and hazardous items (components) warning labels
Identification, reagent preparation method and use method, common fault treatment, waste liquid disposal method, daily maintenance instructions, etc.
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