As an important byproduct of rice bran in the rice milling industry, rice bran oil (RBO) has become increasingly popular in daily diets in recent years. Cadmium (Cd) is a toxic element and easily accumulates in rice bran; thus, it is of great significance to investigate Cd occurrence in RBOs for the sake of public health. In this study, an ultrasound-assisted extraction procedure method using diluted acid followed by inductively coupled plasma mass spectrometry was developed for the determination of Cd in RBOs. Key parameters that affect the ultrasound-assisted extraction of Cd, namely, ultrasonic power, acid extractant, extractant/oil ratio and sonication time, were investigated in detail. Under the optimized extraction conditions with inductively coupled plasma mass spectrometry (ICP-MS) determination, a limit of detection of 0.08 ng g⁻¹, a precision of 5.1%, and recoveries in the range of 97–102% were achieved for the determination of Cd in RBOs. The proposed method is simple, fast and accurate and was applied to analyze RBOs available on the market. The survey showed that the Cd residue was very low, so consumption of RBOs does not pose a risk regarding Cd exposure.

中文翻译：

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ICP-MS快速超声辅助酸浸提取法测定米糠油中的镉

作为米粉工业中米糠的重要副产品，近年来，米糠油（RBO）在日常饮食中变得越来越流行。镉是一种有毒元素，容易在米糠中积累；因此，为了公共卫生，研究RBO中Cd的存在具有重要意义。在这项研究中，开发了一种超声辅助萃取程序方法，该方法使用稀酸然后进行电感耦合等离子体质谱法测定RBO中的Cd。详细研究了影响超声辅助萃取Cd的关键参数，即超声功率，酸萃取剂，萃取剂/油比和超声处理时间。在电感耦合等离子体质谱（ICP-MS）测定的最佳萃取条件下，检测限为0.08 ng g^-1，用于测定RBO中的Cd的准确度为5.1％，回收率在97-102％范围内。该方法简便，快速，准确，可用于分析市场上的RBO。调查显示，镉残留量非常低，因此食用RBO不会对镉暴露造成风险。