Portable food heavy metal detector

It is particularly important to develop a technology that can quickly and accurately detect heavy metal content in food. The portable food heavy metal detector is an innovative product designed to meet this demand.

Food safety refers to ensuring that food does not contain harmful substances during production, processing, storage, and sales, and that consumers do not pose a threat to their health after consumption. However, in recent years, due to intensified environmental pollution and some improper agricultural production methods, the phenomenon of excessive heavy metal content in food has become frequent. Common food heavy metal pollutants include lead (Pb), mercury (Hg), cadmium (Cd), arsenic (As), etc. Once these elements enter the human body, they accumulate and cause damage to multiple organs such as the nervous system, liver, and kidneys, and even lead to serious diseases such as cancer.

Therefore, it is particularly important to develop a technology that can quickly and accurately detect heavy metal content in food. The portable food heavy metal detector is an innovative product designed to meet this demand.

Portable food heavy metal detectors typically operate based on the following technical principles:

1. Atomic Absorption Spectroscopy (AAS)

Atomic absorption spectroscopy is a classic heavy metal detection method that determines the concentration of heavy metals in a sample by measuring changes in light intensity at a fixed wavelength. When a sample containing the metal ion to be tested is heated to high temperature to form atomic vapor, a fixed wavelength light source is used to irradiate the vapor. If the atoms of the metal to be tested can absorb light of this wavelength, the concentration of the metal in the sample can be calculated by measuring the change in transmitted light intensity.

2. Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

ICP-MS combines the advantages of inductively coupled plasma as an ion source and mass spectrometer as a detector. Firstly, the sample solution is atomized into small droplets and enters the high-temperature plasma generated by the high-frequency induction coil, where the elements are ionized into positively charged ions; Then, these ions are separated according to the mass/charge ratio (m/z) and recorded by the detector. ICP-MS has high sensitivity and resolution, making it suitable for the analysis of trace elements in complex matrices.

3. Electrochemical sensor method

Electrochemical sensors use the principle of electrochemical reactions to detect the presence of heavy metal ions. For example, certain fixed electrode materials can undergo specific reactions with heavy metal ions, generating corresponding electrical signals. By measuring the magnitude of these signals, the concentration of heavy metals can be calculated. This method is easy to operate and has a fast response speed, making it very suitable for rapid on-site testing.

4. Fluorescence spectroscopy method

Fluorescence spectroscopy is a method of detection based on the interaction between certain heavy metal ions and fixed fluorescent probes. When heavy metal ions bind to fluorescent probes, it can cause changes in the luminescent properties of the probe molecules. By measuring these changes, the heavy metal content in the sample can be indirectly determined.