Views: 453 Author: Site Editor Publish Time: 2024-10-31 Origin: Site
Application of Yingtai vacuum freeze-drying technology in the field of soil environmental research
I. Soil Testing Contents
Soil testing is a process of analyzing and evaluating various substances in the soil, which is an important work in the fields of agriculture, environmental protection, land development and pollution control, etc. Soil testing contains the following contents: 1. PH value measures the index of acidity and alkalinity of the soil, and the soil is alkaline when the PH value of the soil is higher than 7, and the soil is acidic when the PH value of the soil is less than 7. 2. Organic matter content reflects the fertility and water retention capacity of the soil, including fresh organic matter, microorganisms, simple organic compounds, humus, and semi-decomposed organic matter. 3. Water retention capacity, including fresh organic matter, microorganisms, simple organic compounds, humus, semi-decomposed organic matter.3 Nutrient content includes the content of major nutrients such as nitrogen, phosphorus, potassium, etc., which is crucial for plant growth and development.4 Trace element content includes iron, zinc, copper, manganese, chromium, boron, zinc, etc., trace elements essential to plant growth.5 Soil structure describes the size and arrangement of soil particles, which affects soil aeration, water retention capacity, and the ability of the soil to retain water.6 Soil structure describes the size and arrangement of soil particles. The soil structure describes the size and arrangement of soil particles, which affects soil aeration, water permeability and root growth.6. Moisture contentThe amount of water contained in the soil is essential for plant growth and irrigation management.7. Soil textureThe relative proportion of soil particles, that is, the proportion of sediment in the soil, affects soil water retention, aeration and root growth.8. Heavy metal contentThe amount of heavy metals in the soil (e.g., cadmium, lead, mercury, etc.) can be used to determine whether the soil is polluted. Through regular soil testing, we can understand the trend of soil changes, and according to soil testing we can adjust soil management measures in time to protect the environment and the health of the ecosystem.
Soil freeze-drying method and advantages
Due to the poor stability and reproducibility of fresh soil or sludge test results, high element loss rate, and its complex composition, there is no guarantee that the gas emitted by the soil will have an impact on the human body, and the preservation of the test after the test is also a major problem, so it is generally not directly for testing. Usually, the soil is dried uniformly first, and then ground, sieved, or processed in other ways. Freeze-drying, as the most common method of soil drying, has been sought after by major laboratories since its inception. The principle is to make the liquid water in the soil sample turn into non-crystallized ice at low temperature, without volume expansion, and then let the water sublimate under the low temperature vacuum conditions to be discharged out of the vacuum piping system, so that the soil samples remain dry. Freeze-drying method has a lot of advantages: 1, after freeze-drying treatment, soil samples have low water content, generally less than 5%, and the limit can reach 0.01%, which is conducive to the subsequent processing and analysis. 2, after freeze-drying the soil, soil samples show crispy and porous characteristics, which is convenient for grinding with special grinding instrument. 3, vacuum freeze-drying machine does not need to check the status of the samples in real time, and it can be operated continuously after the parameter is set, and it can alarm and remind through APP if any problem occurs. Problems can be reminded by APP alarm, which greatly improves the drying efficiency.4. Large sample volume, a professional soil freeze-drying equipment can prepare multiple soil samples a day to meet the needs of sample pre-treatment.5. Freeze-drying method can be used to avoid cross contamination of different batches and samples of the same batch by using external freeze-drying vials.