T/CAIA SH004-2015 Determination of Cadmium in Rice by Solid Injection Electrothermal Evaporative Atomic Fluorescence Spectrometry (EI-AFS)

Scope

Scope: This standard specifies the method for determining cadmium in rice using solid sample introduction and electrothermal atomization-atomic fluorescence spectrometry. This standard is applicable to the determination of cadmium content in rice (including brown rice, polished rice, and rice flour). The detection limit of cadmium specified by this method is 0.0005 mg/kg, and the quantification limit is 0.002 mg/kg. Main technical content: After drying and ashing the rice samples, they are introduced into the electrothermal atomizer for heating to evaporate the cadmium into the atomic state. Under the excitation of the emission light of the cadmium hollow cathode lamp, the atomic fluorescence is generated, and the intensity is proportional to the mass of cadmium in the sample. By looking up the corresponding cadmium mass on the calibration curve, the cadmium content in the sample can be calculated. On the basis of the above principle, Appendix A mainly introduces an online atomic capture technology, which can be combined with solid sample introduction and electrothermal atomization-atomic fluorescence to greatly reduce matrix interference.

Development Information

Related Standards