电感耦合等离子体质谱法测定土壤中有效钼OA

The available molybdenum content in soil is crucial for plant growth and development.To accurately and efficiently determine available molybdenum in soil,this study employed an ammonium oxalate-oxalic acid solution as the extractant and optimized its preparation method.The extraction-settling time was optimized to 8 h,and the resulting extract was diluted 2-fold.95Mo was selected as the analytical isotope,and 103Rh was chosen as the internal standard element to correct for matrix effects.After optimizing the instrument parameters,inductively coupled plasma mass spectrometry(ICP-MS)was used for determination.Validation using the standard substance for soil available component analysis yielded a method detection limit of 0.0012 mg/kg and a quantitation limit of 0.0050 mg/kg.The relative standard deviations(RSD)were all below 4％,and the relative errors were all below 2％,with the measured values being in good agreement with the certified values.This method is simple,efficient,and suitable for the continuous determination of large batches of samples.