In fields such as environmental monitoring, agricultural research, and geological exploration, the pretreatment of soil samples is a key step in obtaining accurate analytical data. Among them, soil air drying is an important step in removing excess moisture from samples and preventing microbial activity interference. Its efficiency and effectiveness directly affect the reliability of subsequent experiments such as heavy metal detection and organic matter analysis.As a soil drying equipment designed specifically for soil samples, the soil drying tray significantly improves drying efficiency and sample safety by optimizing ventilation structure and material characteristics.

　　1、 Core design: Dual guarantee of ventilation and pollution prevention

The soil drying tray adopts a porous hollow structure, with circular through holes with a diameter of 2-3mm evenly distributed at the bottom of the tray, with a porosity of 40% -50%, which ensures free air circulation, accelerates water evaporation, and prevents the loss of small soil particles. The tray body is made of food grade polypropylene (PP), which is acid and alkali resistant, anti-aging, and can withstand the temperature range of -20 ℃ to 120 ℃, so as to avoid sample pollution caused by material corrosion. A comparative experiment at a certain environmental monitoring station showed that the heavy metal content detection results of samples using PP air drying discs had an error of less than 5% compared to freeze-drying methods, while traditional bamboo air drying discs had an error of 12% due to the shedding of wood fibers.

　　2、 Structural optimization: modular and anti cross contamination design

The air drying tray adopts a layered stacking structure, with a single layer height of 15cm. Each layer can hold 10-15 standard sample trays, which are fixed by snap on brackets to ensure uniform ventilation between layers. The edge of the disc is designed with a 1cm high raised enclosure to prevent the sample from spilling during flipping; The bottom four corners are equipped with anti slip silicone pads to prevent sliding and tipping during stacking. For different sample types, the air drying tray can be equipped with detachable partitions to divide a single tray into 4-6 independent areas, achieving synchronous air drying of multiple groups of samples without interference.

　　3、 Application scenarios and efficiency improvement

The soil drying tray has been widely used in soil environment monitoring, pesticide residue detection, geological sample analysis and other scenarios. At a provincial environmental monitoring center, the air drying tray and intelligent air drying cabinet are used in conjunction, which can compress the air drying cycle of 500 soil samples from the traditional natural air drying of 7 days to 3 days, and the uniformity of sample moisture content is significantly better than that of natural air drying. Its modular design also supports rapid deployment outdoors, allowing for direct use at sampling sites to avoid microbial growth and compositional changes during sample transportation.

　　4、 Maintenance and Precautions

After use, use a soft bristled brush to clean the remaining soil particles on the disc body to avoid scratching and damaging the surface with hard objects; If contaminated with oil or organic matter, soak in neutral detergent and rinse. Do not use strong acid or alkali cleaning agents. When stored for a long time, the air drying tray should be placed in a dry and ventilated place to avoid direct sunlight that may cause material aging. In addition, during the air drying process, it is necessary to regularly flip the sample to ensure uniform evaporation of moisture and prevent surface crust from affecting the internal air drying efficiency.

The soil drying tray provides an efficient, safe, and environmentally friendly solution for soil sample pretreatment through structural innovation and material upgrading. It has become a crucial "standardized tool" in laboratory and field sampling scenarios, providing a solid guarantee for the accuracy of scientific research.