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# HJ 609-2019

HJ 609-2019_English: PDF (HJ609-2019)
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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
Word Count Estimation 15,184
Date of Issue 12/24/2019
Date of Implementation 3/24/2020
Older Standard (superseded by this standard) HJ 609-2011
Drafting Organization China National Environmental Monitoring Station
Administrative Organization Ministry of Ecology and Environment

S xx
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,%;
maxZ-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 m