T/CAIA T/CAIA-SH00 Determination of Cadmium in Rice by X-ray Fluorescence Spectrometry

Scope

Scope: This standard specifies a screening method for determining the cadmium content in rice by X-ray fluorescence spectrometry. This standard applies to the screening of cadmium content in rice and its products (including brown rice, polished rice, and rice flour). The standard includes initial screening and re-screening: - Initial screening is used to preliminarily determine whether the cadmium content in rice exceeds the standard. The detection limit is 0.068 mg/kg, and the quantification limit is 0.230 mg/kg. - Re-screening is used to further determine whether suspected samples exceed the standard. The detection limit is 0.046 mg/kg, and the quantification limit is 0.150 mg/kg. This standard can also be used for quantitative determination of cadmium content in rice, with a quantitative determination range of 0.066 mg/kg to 2.0 mg/kg. Main technical content: After dehusking, the net paddy is milled into brown rice, polished rice, or ground into rice flour. The brown rice, polished rice, or rice flour is placed in a sample cup. After being excited by high-energy X-rays, the X-ray fluorescence of cadmium in the sample is obtained. The quantitative determination is based on the functional relationship between the amount of X-ray fluorescence and the cadmium content in the sample.

Development Information

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