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Home > News > Food Industry News > Important progress has been made in the same measurement technology of heavy metal mercury and cadmium

Important progress has been made in the same measurement technology of heavy metal mercury and cadmium

foodmate 2023-01-03

Recently, the innovation team of "Agricultural Product Quality and Safety Risk Assessment" from the Institute of Agricultural Quality Standards and Testing Technology of the Chinese Academy of Agricultural Sciences has innovatively developed a composite platinum-plated nickel foam enrichment trap (Pt/Ni) internationally, by plating nickel foam materials , so that the surface of the platinum layer is formed, the first time to achieve the synchronous enrichment of heavy metals mercury (Hg) and cadmium (Cd) after the introduction of electrothermal evaporation. The relevant research results have been published in the top journal in the field of analytical chemistry, Analytical Chemistry.
 
In recent years, the problem of heavy metal pollution in the environment has attracted widespread attention in the society, which will not only pollute the soil of farmland, but also accumulate in agricultural products due to biomagnification, thus posing a serious threat to animal and plant safety and human health. However, the existing conventional detection technology is time-consuming and cumbersome, and it is difficult to analyze directly and quickly on site, while electrothermal evaporation technology (ETV) can directly analyze solid samples without complex sample processing, which is a current research hotspot, but direct evaporation of solid samples will introduce serious matrix interference, thereby affecting its accurate determination. Gas phase enrichment technology realizes the efficient separation of analyte and matrix by specifically capturing the element to be tested, which is an effective means to eliminate matrix interference, but it is currently impossible to achieve simultaneous enrichment of mercury (Hg) and cadmium (Cd) elements, and the separate enrichment device leads to a low degree of integration of the instrument, which is not conducive to the miniaturization of the device.
 
In this study, by plating nickel foam materials to form a platinum layer on the surface, the synchronous capture of Hg and Cd after the introduction of electrothermal evaporation was realized for the first time, and then the complete release of Hg and Cd was realized by heating the composite trap. X-ray photoelectron spectroscopy and scanning electron microscopy were used to verify the enrichment mechanism of Hg and Cd, and revealed that both Hg and Cd were atomic states during evaporation, transport, capture and release. By combining with miniaturized cermet evaporator (MCH) and atomic fluorescence detector, a new type of miniaturized mercury-cadmium detector was constructed, and the detection limit reached 0.04~0.4 μg/kg, which realized the rapid, sensitive and accurate determination of mercury cadmium in soil samples. This technology provides technical support for further realizing the on-site and miniaturization of heavy metal speed measurement instruments, and creates a precedent for the further development of multi-element synchronous enrichment and simultaneous detection technology.
 
The first author of the paper is Liu Tengpeng, a doctoral student, and the corresponding authors are Professor Liu Jixin, senior engineer and researcher Mao Xuefei from the Institute of Agricultural Quality Standards and Testing Technology, Chinese Academy of Agricultural Sciences.

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