Related Information

A few days ago, the Ministry of Finance issued a notice on the special fund budget for soil pollution prevention and control in 2021, totaling 2.8 billion yuan nationwide. The notice clearly lists the amount of arrangements for each province (autonomous region, municipality directly under the Central Government). As of January 24, 2021, Zhejiang, Sichuan, Guangdong, Jiangxi, Hainan, Zhengzhou and other provinces and cities have successively issued regulations on the prevention and control of central soil pollution in 2021. Publicity of funds.

About soil heavy metal pollution

As the main carrier of agricultural production and an important part of the ecological environment, the quality of soil is closely related to people's lives. Soil pollutants can be roughly divided into two categories: inorganic pollutants and organic pollutants. Nowadays, the problem of heavy metal pollution has become an ecological and environmental problem that people attach great importance to. Soil heavy metal pollutants mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc, etc. Although arsenic is not a heavy metal, its behavior, source and hazards are similar to heavy metals, so it is usually listed Discussion on heavy metals. There are two main sources of heavy metal elements in the soil: natural sources and man-made interference inputs: Natural sources: The soil is weathered from rocks, and different rocks contain various heavy metal elements. Dust reduction of heavy metals in the atmosphere is also one of the main natural factors that affect the content of heavy metals in the soil. Volcanic eruptions, forest fires, wave splashing, vegetation discharge, wind dust and other processes have caused a lot of heavy metal dust to float in the air. Part of the heavy metal elements in the air are absorbed by plants, and part of them enters water and soil through dust fall. In nature, soil pollution also affects the content of heavy metals in the soil. Human factors: The development and smelting of non-ferrous heavy metal deposits is the most important source of pollution that emits heavy metals to the environment. Industrial and mining enterprises that discharge heavy metals into the environment through the "three wastes", such as mining, mineral processing, metallurgy, electroplating, electrical engineering, dyes, textiles, oil refining, etc. With the development of urbanization and the increase of various wastes discharged by industry and transportation in the city, the content of heavy metals in urban soil has increased significantly, and the pollution of soil by heavy metals has also become more and more serious, especially the burning of fossil fuels. In agriculture, the application of pesticides, chemical fertilizers, sludge, and sewage irrigation are also one of the main ways to aggravate soil heavy metal pollution.

Soil heavy metal element analysis method

In the laboratory determination methods of soil heavy metal elements, the main analytical methods are: flame atomic absorption method (FAAS), graphite furnace atomic absorption method (GAAS), atomic fluorescence method (AFS), inductively coupled plasma mass spectrometry (ICP-MS) ), inductively coupled plasma emission spectrometry (ICP-OES), cold atomic absorption spectrophotometry, etc. The GB15618-2018 "Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard (Trial)" issued by the Ministry of Ecology and Environment stipulates that the basic items of the soil pollution risk screening value of agricultural land are mandatory items, including cadmium, mercury, arsenic, lead, and chromium. 8 items, copper, nickel, and zinc; GB36600-2018 ``Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial)'' stipulates that the heavy metals and inorganic substances in the basic items of construction land soil pollution risk screening include arsenic, cadmium, and chromium (hexavalent ), 7 items of copper, lead, mercury and nickel. In soil environmental quality and solid waste testing, the common 8 metal element testing methods and reference standards are as follows:

Haiguang supporting equipment and solutions

As a practitioner in the field of environmental protection, Haiguang Instruments can provide solutions ranging from sample pretreatment equipment to inorganic element analysis and testing, and provide strong support for soil environmental quality testing. Haiguang provides inorganic product line detection instruments such as atomic fluorescence, atomic absorption, direct injection mercury analyzer, ICP-MS, and supporting pre-processing equipment. In addition, it also has automatic rapid solvent extraction with GC, LC and chromatography-mass spectrometry and other detection equipment. instrument.