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HJ 613-2011: Soil. Determination of dry matter and water content. Gravimetric method
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Soil. Determination of dry matter and water content. Gravimetric method
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HJ 613-2011
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Basic data | Standard ID | HJ 613-2011 (HJ613-2011) | | Description (Translated English) | Soil. Determination of dry matter and water content. Gravimetric method | | Sector / Industry | Environmental Protection Industry Standard | | Classification of Chinese Standard | Z18 | | Classification of International Standard | 13.080 | | Word Count Estimation | 8,897 | | Date of Issue | 2010-04-15 | | Date of Implementation | 2011-10-01 | | Quoted Standard | HJ 168; HJ/T 166; ISO 11465 | | Adopted Standard | ISO 11465-1993, MOD | | Regulation (derived from) | Department of Environmental Protection Notice No. 32 of 2011 | | Issuing agency(ies) | Ministry of Ecology and Environment | | Summary | This standard specifies the determination of dry matter and soil moisture gravimetric method. This standard applies to all types of dry matter and soil moisture content. | HJ 613-2011: Soil. Determination of dry matter and water content. Gravimetric 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.
Soil.Determination of dry matter and water content.Gravimetric method
National Environmental Protection Standard of the People's Republic
Determination of dry matter and moisture in soils
Soil-Determination of dry matter and water content
-Gravimetric method
Published on.2011-04-15
2011-10-01 Implementation
Ministry of Environmental Protection released
Ministry of Environmental Protection
announcement
No. 32 of.2011
In order to implement the "Environmental Protection Law of the People's Republic of China", protect the environment, protect human health, and standardize environmental monitoring, the soil is now approved.
The three standards, such as the determination of dry matter and moisture in the soil, are national environmental protection standards and are released.
The standard name and number are as follows.
2. Determination of soil tetramine by gas chromatography (HJ 614-2011);
3. Determination of soil organic carbon - Potassium dichromate oxidation - spectrophotometry (HJ 615-2011).
The above standards have been implemented since October 1,.2011 and published by the China Environmental Science Press. The standard content can be found on the website of the Ministry of Environmental Protection.
Special announcement.
April 15,.2011
Content
Foreword..iv
1 Scope..1
2 Normative references..1
3 Terms and Definitions.1
4 method principle..1
5 instruments and equipment. 2
6 samples. 2
7 Analysis steps..2
8 Results calculation and representation..3
9 Quality Assurance and Quality Control 3
10 Notes 3
Appendix A (informative appendix) This standard chapter number is in accordance with ISO 11465.1993 (E) chapter number.4
Appendix B (informative) The technical differences between this standard and ISO 11465.1993(E) and their causes.5
Iv
Foreword
In order to implement the "Environmental Protection Law of the People's Republic of China", protect the environment, protect human health, and regulate the measurement of dry matter and moisture in soil.
Determine the method and formulate this standard.
This standard specifies the gravimetric method for determining dry matter and moisture in soil.
The technical content of this standard is to modify the soil mass dry matter and moisture content based on the mass determination method.
[ISO 11465.1993(E)]. Appendix A gives a comparison of the numbering of this standard chapter number with the ISO 11465.1993 (E) chapter number.
The table, Appendix B gives the technical differences between this standard and ISO 11465.1993 (E) and its causes.
This standard is the first release.
Appendix A and Appendix B of this standard are informative catalogues.
This standard was formulated by the Science and Technology Standards Department of the Ministry of Environmental Protection.
This standard is mainly drafted by. Jinzhou Environmental Monitoring Center Station.
This standard was approved by the Ministry of Environmental Protection on April 15,.2011.
This standard has been implemented since October 1,.2011.
This standard is explained by the Ministry of Environmental Protection.
Determination of dry matter and moisture in soils
Warning. When measuring contaminated samples, avoid contact with the skin. During the test, ventilation, exhaust and other measures should be taken to prevent the laboratory environment.
Or other samples are contaminated.
1 Scope of application
This standard specifies the gravimetric method for determining dry matter and moisture in soil.
This standard applies to the determination of dry matter and moisture in all types of soil.
2 Normative references
The contents of this standard refer to the following documents or their terms. For undated references, the valid version applies to this standard.
quasi.
HJ 168 Technical Guidelines for Standardization and Revision of Environmental Monitoring and Analysis Methods
HJ/T 166 Technical Specifications for Soil Environmental Monitoring
ISO 11465 Soil quality-Determination of dry
Matter and water content on a mass basis-Gravimetric method)
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Dry matter content on a mass basis(wdm)
Refers to the mass fraction of dry residue in the soil under the conditions specified in this standard.
3.2
Water content on a dry mass basis(wH2O)
Refers to the mass of water evaporating from the soil at 105 ° C as a percentage of the mass of dry matter.
3.3
Constant mass constant mass
After the sample is dried, the cooled sample is continuously weighed twice at a drying interval of 4 h, and the difference between the front and the back does not exceed the final measurement.
The constant mass is 0.1%, and the weight at this time is constant weight.
Note 1. In general, most soils have a drying time of 16 to 24 hours, and a few special soil samples and large particle soil samples take longer.
4 Principle of the method
The soil sample is baked to constant weight at (105±5) °C, and the dry matter and moisture content are calculated by the difference of soil sample mass before and after drying.
The score is expressed.
5 Instruments and equipment
5.1 Air drying oven. (105 ± 5) °C.
5.2 Dryer. Contains anhydrous color-changing silica gel.
5.3 Analytical balance. Accuracy is 0.01 g.
5.4 Covered container. waterproof material and does not absorb moisture. For drying air-dried soil, the volume should be 25 ~ 100 ml, used for drying fresh water
The volume of wet soil should be at least 100 ml.
5.5 Sample spoon.
5.6 Sample sieve. 2 mm.
5.7 Common instruments and equipment used in general laboratories.
6 samples
6.1 Sample collection and preservation
Soil samples were collected and stored in accordance with the relevant regulations of HJ/T 166.
6.2 Preparation of samples
6.2.1 Air dried soil sample
Take a proper amount of fresh soil sample on a clean enamel plate or glass plate to avoid direct sunlight and the ambient temperature does not exceed 40 °C.
It is naturally air-dried to remove impurities such as stones and branches and pass through a 2 mm sample sieve. Crush the >2 mm clods and pass through a 2 mm sample sieve and mix.
To be tested.
6.2.2 Fresh soil sample
Take a proper amount of fresh soil sample and sprinkle it on a clean, non-absorbent glass plate and mix thoroughly to remove stones larger than 2 mm in diameter.
Impurities such as branches, to be tested.
Note 2. Determination of trace organic contaminants in samples can not remove impurities such as stones and branches. Therefore, the determination of the dry matter content does not eliminate stones, branches, etc.
Impurities.
7 Analysis steps
7.1 Determination of air-dried soil samples
The covered container and lid were dried at (105 ± 5) °C for 1 h, slightly cold, covered, and then placed in a desiccator for at least 45 min.
The mass m0 of the container with lid was measured to the nearest 0.01 g. Transfer 10 to 15 g of air-dried soil sample (6.2.1) to the weighed sample with a sample spoon
In a covered container, cover the container lid and measure the total mass m1 to the nearest 0.01 g. Remove the container lid and combine the container with the air-dried soil sample.
Place in an oven and dry to constant weight at (105 ± 5) °C while drying the lid. Cover the container lid and place in a desiccator for at least 45 minutes.
Immediately after removal, the total mass m2 of the covered container and the dried soil was determined to the nearest 0.01 g.
7.2 Determination of fresh soil samples
The covered container and lid were dried at (105 ± 5) °C for 1 h, slightly cold, covered, and then placed in a desiccator for at least 45 min.
The mass m0 of the container with lid was measured to the nearest 0.01 g. Transfer 30 to 40 g of fresh soil sample (6.2.2) to the weighed sample with a sample spoon
In a covered container, cover the container lid and measure the total mass m1 to the nearest 0.01 g. Remove the container lid and combine the container with the fresh soil sample
Place in an oven and dry to constant weight at (105 ± 5) °C while drying the lid. Cover the container lid and place it in a desiccator to cool at least
At 45 min, the total mass m2 of the covered container and the dried soil was measured immediately after removal, to the nearest 0.01 g.
Note 3. The sample to be tested should be analyzed as soon as possible to reduce the evaporation of water.
8 Calculation and representation of results
The dry matter content wdm and the moisture content wH2O in the soil sample were calculated according to the formulas (1) and (2), respectively.
Dm
( )
( )
m mw
Mm
−= ×− (1)
HO
( ) 100
( )
m mw
Mm
−= ×− (2)
Where. wdm--the dry matter content in the soil sample, %;
wH2O--the moisture content in the soil sample, %;
M0--the quality of the container with lid, g;
M1--total container and air-dried soil sample or total volume of covered container and fresh soil sample, g;
M2--the total mass of the container with lid and dried soil, g.
The measurement results were accurate to 0.1%.
9 Quality Assurance and Quality Control
9.1 Determination of air-dried soil samples, when the dry matter content is >96%, the moisture content is ≤4%, the absolute value of the difference between the two determination results should be ≤0.2%
(mass fraction); when the dry matter content is ≤96% and the moisture content is >4%, the relative deviation of the two determination results should be ≤0.5%.
9.2 Determination of fresh soil samples, when the moisture content ≤ 30%, the absolute value of the difference between the two determination results should be ≤ 1.5% (mass fraction);
When the moisture content is >30%, the relative deviation of the two determination results should be ≤5%.
10 Precautions
10.1 During the test, the fine particles of soil in the covered container should be prevented from being blown out by air or wind.
10.2 In general, the decomposition of organic matter at (105 ± 5) °C is negligible. But for organic matter content >10% (mass fraction)
For soil samples (such as peat soil), the drying temperature should be changed to 50 ° C, then dried to constant weight, if necessary, vacuum can be used to shorten the drying
time.
10.3 Some minerals (such as gypsum) lose crystal water when dried at 105 °C.
10.4 If the sample contains volatile (organic) substances, this method cannot accurately determine its moisture content.
10.5 If the sample to be tested contains gypsum, measure fresh wet soil containing stones, branches, etc., and other effects that affect the measurement results.
The volume should be indicated in the test report.
10.6 Soil moisture content is calculated based on dry matter quality, so the result may exceed 100%.
Appendix A
(informative appendix)
This standard chapter number is compared with the ISO 11465.1993 (E) chapter number
Table A.1 gives a list of the numbering of chapters in this standard and the numbering of ISO 11465.1993(E).
Table A.1 The standard chapter number is compared with the ISO 11465.1993 (E) chapter number
The international standard chapter number corresponding to this article number
twenty two
Note 1 Note 1
5.1～5.5 5.1～5.5
5.6~5.7 -
6.1 -
6.2.1 The first sentence of Chapter 6
6.2.2 7.2.1
Note 2 Note 6
7.1 7.1.1 to 7.1.4
7.2 7.2.2~7.2.5
Note 3 7
- Note 8
- Chapter 10 a), b), c)
10.1~10.4 Note 2~Note 5
10.5 Chapter 10, d) and e)
10.6 Note 9
Appendix B
(informative appendix)
Technical differences between this standard and ISO 11465.1993(E) and their causes
Table B.1 gives a list of the technical differences between this standard and ISO 11465.1993(E) and their causes.
Table B.1 Technical differences between this standard and ISO 11465.1993(E) and their causes
Reasons for technical differences in the chapter numbering of this standard
2 The normative references of the two are different in content
The first reference in ISO 11465.1993(E) is not covered in this standard.
Quasi-content, while specifying the specific sample preparation method in the standard text,
There is no need to quote the second standard. In addition, this standard refers to the provisions of HJ/T 166
Sample collection and storage, with reference to HJ 168 and ISO 11465.
1993 (E) prepared the standard
5.6 and 5.7
Based on ISO 11465.1993(E), increase
2 mm soil screen and general laboratory equipment
And equipment
2 mm soil sieves are required for the preparation of air-dried soil samples, as well as
General laboratory instruments and equipment
6.1
ISO 11465.1993(E) does not have this section,
Relevant content is specified in other chapters
This standard adds this clause according to the standard structural elements specified in HJ 168.
The preparation is consistent with the content specified in ISO 11465.1993(E)
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