Zhao Mo-Tian, Wang Jun, Lu Baikeng, Lu Hai
National Research Center for Certified Reference Materials, Beijing 100013, China.
Rapid Commun Mass Spectrom. 2005;19(7):910-4. doi: 10.1002/rcm.1870.
The materials used to prepare the certified reference materials (CRMs) for Cd rice flour described here were taken from Cd-contaminated rice samples, round-grained and non-sticky rice grown in different provinces throughout China. The Cd rice materials were first blown to remove dust and husk, and then were successively ground, sieved, dried and mixed to form homogeneous rice flour. The Cd rice flour was packed in glass bottles, each bottle containing 40 g. All bottled CRMs were subjected to 60Co radiation (2.5 megarads) for long-term preservation. Atomic absorption spectrometry was used to determine the homogeneity of the cadmium content in each material. The certification of the cadmium content for the three CRMs was performed using isotope dilution mass spectrometry.
此处所述用于制备镉米粉标准物质（CRMs）的材料取自中国不同省份种植的受镉污染的大米样本，即圆粒非糯性大米。镉大米材料首先经过吹风以去除灰尘和稻壳，然后依次进行研磨、筛分、干燥和混合，以形成均匀的米粉。镉米粉装于玻璃瓶中，每瓶装有40克。所有瓶装标准物质均接受60Co辐射（250万拉德）以进行长期保存。使用原子吸收光谱法测定每种材料中镉含量的均匀性。三种标准物质的镉含量认证采用同位素稀释质谱法进行。
