Bottom mud is usually a mixture of clay, silt, organic matter, and various minerals. It is formed by depositing at the bottom of the water body after a long time of physical, chemical, and biological action and water transmission. The sediment with a thickness of 0 to 15 cm on the surface is called surface sediment, and the sediment with a thickness of more than 15 cm is called deep sediment. Bottom mud is the sediment of rivers and lakes and an important part of natural waters. When the water area is polluted, part of the pollutants in the water can be stored in the bottom sludge through precipitation or particulate matter adsorption, and then released under appropriate conditions to become a source of secondary pollution. This type of pollution is called bottom sludge pollution. Test items: mercury, lead, cadmium, copper, zinc, chromium, nickel, arsenic and other heavy metals or inorganic non-metallic toxic substances, total nitrogen, total phosphorus, PH, moisture content, organic m

Soil monitoring is basically the same as water quality and atmospheric monitoring. The various physical and chemical properties of the soil are measured by appropriate measurement methods, such as iron, manganese, total potassium, organic matter, total nitrogen, available phosphorus, total phosphorus, moisture, total arsenic, available boron, Fluoride, chloride, mineral oil and total salt content, etc., to achieve the purpose of monitoring the status of soil quality; monitoring of soil pollution accidents; dynamic monitoring of pollutant land treatment; soil background value investigation. my country's "Soil Environmental Quality Standard" stipulates that 11 items of heavy metals, pesticides and pH are monitored. The "Technical Specifications for Monitoring Farmland Soil Environmental Quality" divides soil monitoring projects into three categories: mandatory testing items, selection mandatory testing items, and selection items. Select required test items and selected test items include

The "Law of the People's Republic of China on Soil Prevention and Control" was promulgated on August 31, 2018 and officially implemented on January 1, 2019. my country's soil prevention and control has ushered in a new situation, and local environmental protection regulatory agencies will continue to strengthen in accordance with the requirements of regulations Supervise soil pollution sources and establish a soil environmental monitoring system for enterprise land. Environmental investigations on soil sites have become a key task for soil prevention and control in various regions. Service Scope: Farmland soil environment inspection, soil environment inspection for construction projects, regional soil background value investigation, site investigation.