Determination of total iodine content in animal feeds by microwave-assisted extraction and inductively coupled plasma-mass spectrometry(ICP-MS)methods
An accurate and efficient method for determining total iodine content in animal feeds was proposed in this study.Microwave-assisted extraction method was employed to pretreat the samples and compared with traditional heating extraction method in term of extraction effect.Such key parameters as extractant,extraction temperature and time were put into discus-sion and optimization.Then,the iodine content was detected using inductively coupled plasma-mass spectrometry(ICP-MS).Detection conditions including mass number,internal standard element,and detection mode were discussed,and the detection method was methodologically testified.Under the optimized conditions,the linear correlation coefficient of iodine content was greater than 0.995 between 0 and 200 μg/L,and the limit of detection was up to 0.030 mg/kg,with the recoveries ranging from 94％to 101％at six spiked levels.The method is efficient,accurate and suitable for determining total iodine in animal feeds.
feedtotal iodinealkaline extractionmicrowave-assisted extractioninductively coupled plasma mass spectrom-etry(ICP-MS)
万方数据
维普
