The current soil monitoring regulations have been formed, and the national soil environmental monitoring system is in full swing. As an important part of soil monitoring, sample preparation of soil is essential. Soil sample preparation requires the treatment of the soil to maintain the shape, no material loss, to ensure the accurate determination of soil properties. At present, there are three forms of soil sample pretreatment: air drying, drying and lyophilization. This article details the common air drying and lyophilization methods.
Environmental monitoring of soil samples in the original drying method: air drying
The collected soil samples are placed on the sample tray or placed on the sample holder with a kraft paper mat, spread into a thin layer, and air-dried in a clean and tidy room. Drying time is generally between a few days and half a month, subject to weather conditions and humidity conditions.
Environmental monitoring soil sample drying method: soil freeze dryer drying method
The collected soil samples were placed on a sample tray and spread to a thickness of about 20 mm. They were placed in a Pilot 5-8ES soil freeze-drying machine, and a freeze-drying procedure was set up to start with one button. The drying time is generally within 24 hours, based on the thickness of the sample, and the thickness is longer than 20 mm.
Technical analysis:
Soil sample treatment has always been treated by air drying or low temperature drying. The disadvantage is low efficiency and long drying. For multi-sample quantities, it cannot be disposed of in time. A few years ago, some environmental monitoring departments took the lead in using imported freeze dryers as dry disposal equipment, but because of the use of general rather than special equipment, resulting in high investment and low returns. Under the premise of the market gap in the drying of soil samples, Bo Medical Organization organized the scientific research force and developed a special freeze-drying machine for soil for 3 years.
So far, Bo Medical Kang has formed a complete soil monitoring sample pretreatment program. The soil sample pretreatment scheme covers the freeze-drying of the elements before the soil sample is detected, the freeze-drying of the soil organic matter, the locking of the original form of the soil, and the preservation of the soil sample before the test to ensure the authenticity and effectiveness of the soil sample monitoring.
Bo Yikang soil sample pretreatment solution hardware covers soil freeze dryer (pilot5-8ES), volatile organic matter collector, soil freeze-dried material anti-leak protection device.
The Bokang soil lyophilizer and solution have been delivered to the first line of soil monitoring in some provinces. Next, Bo Yikang will develop more environmental protection equipment to serve China's environmental protection cause and benefit mankind.
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