微波消解-电感耦合等离子体质谱法测定水系沉积物中的钍OA

A microwave digestion system was employed for sample preparation,and inductively coupled plasma mass spectrometry(ICP-MS)was used to determine thorium content in aquatic sediments.Through optimization of the pretreatment method,instrument parameters,and inter-ference correction strategies,a highly sensitive and accurate ICP-MS determination method was established.Experimental results indicated that-the linear calibration curve has a mass the concentration range of 0-100 μg/L with a correlation coefficient r of 0.9999.The method detection limit was determined to be 0.001 mg/kg,with a lower limit of quantification of 0.004 mg/kg.The relative standard deviation(RSD)for parallel samples ranged from 1.7%to 4.4%(n=6),while the relative error for certified reference materials ranged from-0.2%to1.3%.Spiked sample recovery rates were85.1%～93.9%.Application of this method to actual river sediment samples indicates that thorium in sediments from this region primarily originates from natural geological backgrounds,with no significant anthropogenic contamination detected.