In terms of the needs of plants, they can be divided into two categories: one is the elements that are not required for plant growth and development, and the harm to human health is obvious, such as cadmium, mercury, lead, etc.; the other is the normal growth and development of plants. Elements, and the body has some physiological functions, such as copper, zinc, etc., but too much pollution will occur, hindering plant growth and development. Usually the upper limit of the content of these elements in normal soil is from one to several hundred mg/kg. So how do you measure the content of these heavy metals in the soil? There are many methods for determination, and in recent years, the application of soil heavy metal detectors has become even more useful.
Atomic Absorption Spectrophotometry is a national standard method selected for soil extract analysis, and its precision is very high. Graphite furnace AAS is high precision but expensive, usually flame AAS can meet the demand. However, AAS can only detect one element at a time, and different measurement methods are required for different elements, and the operator's requirements are relatively high. X-ray fluorescence analysis, especially energy-dispersive X-ray fluorescence analysis, has mature handheld products for sale on the market, allowing simultaneous rapid analysis of multiple elements and real-time observations. Because XRF does not require the use of strong acids, etc. to dissolve the sample, it is easy to use in the field and can meet the application requirements of metal detection in most soils. However, due to the nature of X-rays, to achieve laboratory-level accuracy, there are certain requirements for the preparation of samples for on-site testing.
The design principle of the soil heavy metal detector is the X-ray correlation principle, which plays an important role in the measurement of heavy metal content in the soil, and the measurement results are also very accurate.
Atomic Absorption Spectrophotometry is a national standard method selected for soil extract analysis, and its precision is very high. Graphite furnace AAS is high precision but expensive, usually flame AAS can meet the demand. However, AAS can only detect one element at a time, and different measurement methods are required for different elements, and the operator's requirements are relatively high. X-ray fluorescence analysis, especially energy-dispersive X-ray fluorescence analysis, has mature handheld products for sale on the market, allowing simultaneous rapid analysis of multiple elements and real-time observations. Because XRF does not require the use of strong acids, etc. to dissolve the sample, it is easy to use in the field and can meet the application requirements of metal detection in most soils. However, due to the nature of X-rays, to achieve laboratory-level accuracy, there are certain requirements for the preparation of samples for on-site testing.
The design principle of the soil heavy metal detector is the X-ray correlation principle, which plays an important role in the measurement of heavy metal content in the soil, and the measurement results are also very accurate.
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