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HJ 802-2016: Soil quality - Determination of conductivity- Electrode method
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Soil quality - Determination of conductivity- Electrode method
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HJ 802-2016
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Basic data | Standard ID | HJ 802-2016 (HJ802-2016) | | Description (Translated English) | Soil quality - Determination of conductivity- Electrode method | | Sector / Industry | Environmental Protection Industry Standard | | Classification of Chinese Standard | Z18 | | Word Count Estimation | 7,765 | | Date of Issue | 2016-06-24 | | Date of Implementation | 2016-08-01 | | Regulation (derived from) | Ministry of Environmental Protection Announcement No.47, 2016 | | Issuing agency(ies) | Ministry of Ecology and Environment | HJ 802-2016: Soil quality - Determination of conductivity- Electrode method---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.
(Determination of Soil Conductivity Electrode)
National Environmental Protection Standard of the People 's Republic of China
Determination of soil electrical conductivity by electrode method
Soil quality-Determination of conductivity- Electrode method
2016-06-24 released
2016-08-01 implementation
Ministry of Environmental Protection released
Directory
Foreword
1 Scope of application
2 normative reference documents
3 Terms and definitions 1
4 Principle of the method
5 interference and elimination
6 reagents and materials 1
7 instruments and equipment 2
8 Sample 2
9 Analysis steps
The results are calculated and expressed
11 precision
12 Quality assurance and quality control
13 Precautions .4
Foreword
To implement the "People's Republic of China Environmental Protection Law" to protect the environment, protect human health, regulate soil conductivity
The determination of the method, the development of this standard.
This standard specifies the electrode method for determining soil conductivity.
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. Jinzhou City Environmental Monitoring Center Station.
The standard verification unit. Zhengzhou City Environmental Protection Monitoring Center Station, Liaoning Province Environmental Monitoring Experimental Center, Shenyang City Ring
Environmental Monitoring Center Station, Anshan City Environmental Monitoring Center Station, Dalian Environmental Monitoring Center and Yingkou City Environmental Monitoring Center Station.
The Environmental Protection Department of this standard is approved on June 24,.2016.
This standard has been implemented since August 1,.2016.
This standard is explained by the Ministry of Environmental Protection.
Determination of soil electrical conductivity by electrode method
1 Scope of application
This standard specifies the electrode method for determining soil conductivity.
This standard is applicable to the determination of dry soil conductivity.
2 normative reference documents
The contents of this standard refer to the following documents or their terms. Any annotated file that does not specify the date, its valid version
Applicable to this standard.
Technical specification for soil environmental monitoring
3 terms and definitions
The following terms and definitions apply to this standard.
Soil conductivity
Refers to the ability of the soil to conduct current, expressed by the determination of the conductivity of the soil extract.
3.2 conductivity cell constant the cell constant
The conductivity cell, also known as the conductive electrode, consists of two pieces of metal that are fixed on the glass bracket. The conductivity cell constant refers to the electrode surface
The ratio of the distance A between the product A and the two electrodes. Since the electrode area and the distance between the two electrodes are fixed,
L/A is a constant, called the conductivity cell constant, expressed in Q. It is an important physical measure of the conductivity of the conductivity cell
number.
4 principle of the method
Take natural dry soil samples and add water at a ratio of 1. 5 (m/V) and shake at 20 ° C ± 1 ° C.
The conductivity of the extract was measured at 25 ° C ± 1 ° C.
When the two electrodes are inserted into the extract, the resistance between the two electrodes can be measured. When the temperature is constant, the resistance value R is related to electricity
The conductivity K is inversely proportional to R = Q/K. When the conductivity cell constant Q is known, the conductance of the extract is measured
rate.
5 interference and elimination
When the measured value is less than 1 mS/m, the carbon dioxide and ammonia in the air affect the determination of the conductivity. In the closed
Small space to operate, can eliminate or reduce its interference.
6 reagents and materials
6.1 Experimental water. 25 ℃ when the conductivity is not higher than 0.2 mS/m.
6.2 potassium chloride (KCl). excellent grade pure.
Before use, should be at 220 ℃ ± 10 ℃ for 24 h, stand-by.
6.3 Standard solution for potassium chloride. c (KCl) = 0.1000 mol/L.
Accurately weighed 7.456 g (accurate to 0.001 g) potassium chloride (6.2) dissolved in 20 ℃ amount of water, the amount transferred to 1000
Ml capacity of the bottle, with the experimental water (6.1) constant volume to the scale, mix, into the closed polyethylene bottle to save;
The conductivity of the solution at 25 ° C is 1290 mS/m. You can also purchase commercially available standard solutions.
6.4 Standard solution for potassium chloride.
The potassium chloride standard stock solution (6.3) was diluted with 20 ° C water (6.1) to prepare various concentrations of potassium chloride standard
Solution, temporary use, its concentration and the corresponding conductivity (25 ℃), see Table 1.
Table 1 Concentration of potassium chloride standard solution and corresponding conductivity (25 ° C)
Concentration (mol/L) Conductivity (mS/m)
0.0005 7.4
0.0010 14.7
0.0100 141
0.0200 277
Note 1. The standard solution of potassium chloride (6.4) should be transferred to a closed polyethylene bottle and the sealed polyethylene bottle should not contain alkaline or alkaline gold
Is a cation. Recommend the use of plastic bottles.
6.5 Qualitative filter paper.
7 instruments and equipment
7.1 Conductivity meter. Adjustable range setting and temperature correction function, the instrument measurement error does not exceed 1%.
7.2 Analytical balance. Accuracy of 0.01 g and 0.001 g, respectively.
7.3 Thermometer. Accuracy of 0.1 ℃.
7.4 Reciprocating horizontal thermostat. 20 ℃ ± 1 ℃, 180 r/min, the amplitude is not less than 5 cm.
7.5 shaking bottle. 250 ml, borosilicate glass or polyethylene material.
7.6 Centrifuge. 0 r/min ~ 4000 r/min.
7.7 Polyethylene centrifuge tube. 100 ml.
7.8 Sample sieve. 2 mm, nylon material.
7.9 General laboratory equipment and equipment commonly used.
8 samples
8.1 Collection and storage of samples
The collection and storage of soil samples was carried out in accordance with HJ/T 166. Send the collected soil samples to the laboratory and place them
The tray is air-dried at room temperature.
8.2 Preparation of samples
The soil samples were air dried, shrunk, ground and over 2 mm sieve (7.8) according to the relevant regulations of HJ/T 166.
8.3 Preparation of sample
Weigh 20.00 g soil sample (8.2) In a 250 ml shaker (7.5), add 100 ml of 20 ° C ± 1 ° C
Water (6.1), cover the cap and place it on a reciprocating horizontal thermostat (7.4) and shaken at 20 ° C ± 1 ° C for 30 min.
After removing the shaking flask for 30 min, the supernatant was filtered through qualitative filter paper (6.5) and the filtrate was collected in a 100 ml beaker,
To be tested.
Note 2. After removing the shaking bottle for 30 min, the extract can be centrifuged at 3000 r/min for 30 min.
8.4 Preparation of laboratory blank samples
Weigh the sample and add 100 ml of water (6.1) at 20 ° C ± 1 ° C directly to the 250 ml shaker (7.5)
Prepare a laboratory blank sample in the same manner as in the preparation of the sample (8.3).
9 Analysis steps
9.1 Determination of conductivity cell constant
The conductive cell was washed three times with 0.01 mol/L potassium chloride standard solution (6.4), and the conductivity cell was inserted into the standard solution
And the resistance Rkcl of the standard solution was measured at a temperature of 25 ° C ± 1 ° C for 15 min. Replace the standard solution again
The measurement was repeated several times, and the resistance Rkcl was stabilized within the range of ± 2%, and the average value KClR was measured three times,
Calculate the conductivity constant of the 0.01 mol/L potassium chloride standard solution at 25 ° C according to formula (1).
KClR141Q = (1)
Where. Q - 0.01 mol/L potassium chloride standard solution at 25 ℃ when the conductivity cell constant;
KClR - 0.01 mol/L potassium chloride standard solution at 25 ℃, 3 times the average determination of resistance, Ω;
141 - 0.01 mol/L potassium chloride standard solution at 25 ℃, the corresponding conductivity value, mS/m.
Note 3. Determination of conductivity cell constant or calibration using potassium chloride standard solution similar to that of soil extract based on actual sample conditions
Quasi-instrument.
Note 4. If an electrode with a known conductivity cell constant is used, it is not necessary to determine the conductivity cell constant, which can be adjusted according to the instruction manual of the conductivity meter
Good instrument, and with the corresponding concentration of potassium chloride standard solution after calibration equipment, direct determination.
9.2 Determination of sample
Rinse the electrode several times with water and rinse the electrode with the extracted extract (8.3). Insert the electrode into the extract (8.3)
According to the instructions of the conductivity meter, the temperature is corrected to 25 ℃ ± 1 ℃, the determination of soil extract (8.3) of the electricity
Conductivity. Read the conductivity values directly from the conductivity meter and record the temperature of the extract.
9.3 Determination of laboratory blank samples
The conductivity of the laboratory blank sample was determined according to the same procedure as in the determination of the sample (9.2).
10 results are calculated and expressed
The conductivity of the extract is obtained directly from the instrument, expressed in mS/m. When the result is greater than or equal to
100 mS/m, the three effective digits are retained; when the result is less than 100 mS/m, it is reserved for one decimal place.
11 precision
Six soil samples of Jiangxi red soil (ASA-5A) and Guangdong paddy soil (ASA-6A)
Six parallel determinations were performed with an average of 6.9 mS/m and 36.0 mS/m, respectively. The relative standard deviations between the tests were
3.3% and 0.8%, the reproducibility limits were 0.3 mS/m and 1.1 mS/m, respectively, and the reproducibility limits were 0.7 mS/m and 1.3
MS/m.
Two standard samples of Jiangxi red soil (ASA-5A) and fly ash (GB W08401) were carried out in the laboratory.
The mean values were 7.0 mS/m and 166 mS/m, respectively, and the relative standard deviations were 1.7% and 2.2%, respectively.
12 quality assurance and quality control
12.1 Each batch should be tested for a laboratory blank and the blank conductivity should not exceed 1 mS/m. Otherwise it should be found
Cause, re-determination.
12.2 Before each batch test (or monthly), the instrument should be calibrated with potassium chloride standard solution, and the conductivity can be measured three times
The relative error should not exceed 5% relative to the conductivity of a known concentration standard solution. Otherwise it should be cleaned or more
Exchange electrode.
12.3 Every 10 samples or each batch (less than 10 samples/batch) should be made a parallel sample, parallel sample test results allowed
The error is shown in Table 2.
Table 2 Reproducibility of Conductivity Values
25 ℃ conductivity allows error
≤ 50 5 mS/m
> 50 to.200 20 mS/m
≥200 10%
13 Precautions
13.1 When a small bubble is attached to the surface of the electrode, the vibration vessel should be tapped and removed to avoid measurement errors.
13.2 Sample extraction should avoid severe oscillations.
13.3 samples after extraction, should be measured in time.
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