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Anonymous users2024-02-16Answer: The soil samples collected from the field should be placed on the sample tray in time, spread into a thin layer, and placed in a clean and tidy indoor ventilation place to air dry naturally, and it is strictly forbidden to expose to the sun, and pay attention to prevent pollution by acids, alkalis and other gases and dust. During the drying process, the soil sample should be turned frequently and the large soil clods should be crushed to speed up drying, and at the same time, intrusions other than the soil should be removed.
The air-dried soil samples are ground and sieved according to different analysis requirements, fully mixed, and then packed into sample bottles for later use. A label is placed inside and outside the bottle, indicating the number, sampling location, soil name, sampling depth, sample particle size, sampling date, sampler and sample preparation time, sample maker and other items. The prepared samples should be properly stored to avoid contamination by sunlight, high temperature, humidity and acid and alkali gases.
After all the analysis work is completed and the analysis data is verified, the sample is generally stored for 3 months to 1 year for inquiry. A small number of valuable samples that need to be stored for a long time should be stored in a jar and sealed with wax.
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Anonymous users2024-02-15The sample is spread out and placed, part of the sample is taken after air drying, its weight m1 is weighed, and then dried to constant weight m2, and the moisture content of air drying = (m1-m2) m2*100.
The amount of moisture in the wood is usually measured by the moisture content or the water content.
moisture
content, abbreviated as MC), that is, expressed as a percentage of the ratio of the mass of moisture in the wood to the mass of the wood. According to the different calculation standards, it is divided into two types: absolute moisture content and relative moisture content.
In the production of wood drying, absolute moisture content (MC) is generally used, that is, the mass of moisture in the wood accounts for the percentage of the absolute dry mass of the wood.
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Anonymous users2024-02-14Summary. Sorry, I can't provide images or sketches, but I can provide you with a text description. Procedure and process for the preparation of air-dried soil samples:
Fresh soil samples are collected and impurities such as large pieces of soil and plant residues are removed using a sieve. The treated soil samples were evenly spread out in a ventilated place at room temperature and allowed to air dry. To ensure that the soil samples are completely air-dried, it is recommended to wait 24 hours before analysis.
Procedure and process for preparing samples for each particle size analysis: the air-dried soil samples are sieved twice and divided into different groups according to the particle size. The common sieving particle size is 2mm, 1mm, etc.
For each group of sieved soil samples, an appropriate amount of samples was taken for subsequent analysis. The specific methods of subsequent analysis are selected according to the needs, and the common methods include organic matter content analysis, pH value determination, microbial number detection, etc. The above is a brief description of the procedure and process of preparing fresh soil samples into air-dried soil samples and samples for analysis of each particle size.
Baozi, I can't send ** here.
I send it to you in the form of a text.
Sorry, I can't provide images or sketches, but I can provide you with a text description. Procedure and process for preparing air-dried soil samples: Fresh soil samples are collected and impurities such as large pieces of soil and plant residues are removed using a sieve.
The treated soil samples were evenly and generously spread in a ventilated area at room temperature and allowed to air dry. To ensure that the soil samples are completely air-dried, it is recommended to wait 24 hours before analysis. Procedures and procedures for the preparation of samples for analysis at various particle sizes:
The air-dried soil samples were screened twice and divided into different groups according to particle size. The common sieving particle size is 2mm, 1mm, etc. For each group of sieved soil samples, an appropriate amount of samples was taken for subsequent splitting of orange tung precipitation.
The specific methods of subsequent analysis are selected according to the needs, and the common methods include organic matter content analysis, pH value determination, microbial number detection, etc. The above is a brief description of the procedure and process of preparing fresh soil samples into air-dried soil samples and samples for analysis of each particle size. Wu Chan. Good.
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Anonymous users2024-02-13A: The quivering of some soils refers to the fact that the composition of iron, nitrate, ammonium nitrogen, etc., will change significantly during the air-drying process and must be analyzed with fresh samples. In order to truly reflect some physical and chemical properties of the soil in the natural state of the field, fresh samples should be sent back to the room for processing and analysis in time, and the samples should be mixed with coarse glass rods or plastic rods and then quickly weighed for measurement.
If you need to store them temporarily, you can put them in a plastic bag, tie the bag tightly, and store them in the refrigerator or freeze them.
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