Recently, the innovation team of”risk assessment of agricultural product quality and safety” of the Institute of agricultural quality standards and testing technology, Chinese Academy of Agricultural Sciences, developed a new online enrichment material based on foam nickel, which increased the enrichment efficiency of heavy metal cadmium by four times, achieved complete capture, and further improved the detection sensitivity and long-term stability. The research results were published in the authoritative journal of analytical atomic spectroscopy.
Cadmium (CD) widely exists in the environment of agricultural production areas, which is easy to accumulate in rice and other crops, thus posing a serious threat to animals, plants and human health. However, the traditional cadmium measurement technology is time-consuming and cumbersome, and can not be quickly analyzed on site. Electrothermal evaporation (ETV) technology can realize direct sample injection detection without sample digestion, but complex matrix interference will seriously affect the precision and sensitivity of heavy metal detection. Gas phase enrichment technology is an effective means to eliminate matrix interference. The research group has previously developed a tungsten trap (TC) gas phase enrichment device, which specifically realizes the enrichment of cadmium. However, due to the material structure, its capture efficiency is only about 20%, which not only loses the analytical sensitivity of the instrument, but also is not conducive to long-term stability.
In this study, a new foam nickel enrichment trap (NT) was developed, which increased the capture efficiency of electrothermal evaporation to nearly 100%for the first time, and realized the rapid and accurate determination of cadmium in soil samples, with a detection limit of 0.035 ng/g. Compared with the original technology, the enrichment efficiency of the new technology has been significantly improved, and the detection sensitivity and long-term stability have been further improved, which provides a key core component for further realizing the on-site and miniaturization of heavy metal rapid detection instruments.
The research results have been supported by national key R & D plans and other projects.