T/CAIA SH014-2021 Rapid determination of cadmium in food by solid direct injection electrothermal evaporation atomic absorption spectrometry
T/CAIA SH014-2021 Rapid determination of cadmium in food by solid direct injection electrothermal evaporation atomic absorption spectrometry
Basic Information
Scope
Scope: This document is applicable to the determination of cadmium content in food samples such as rice, wheat, corn, and soybean. When the sample injection amount is 0.1 g, the method's quantification limit is 0.003 mg/kg, and the measurement range is 0.003~2.0 mg/kg; Main technical content: After the food samples are introduced into the electric heating evaporator, the air flow is used to heat the samples to remove water and organic matter. The cadmium released from the samples during pyrolysis in nitrogen-hydrogen mixed gas is atomized in a hydrogen flame. Cadmium atoms absorb the characteristic spectral line at 228.8 nm. Within a certain concentration range, the absorption intensity is proportional to the cadmium concentration, and the quantification is performed by external standard method.