原子荧光光谱法测定土壤和沉积物中铋

建立了王水沸水浴消解-原子荧光光度法测定土壤和沉积物中铋。优化了仪器参数、载流及还原剂浓度，比较了水浴消解、微波消解和电热板消解三种前处理方式处理土壤/沉积物中铋的优劣。实验表明，最佳的消解方式为水浴消解，该方法操作简单方便，结果准确，可靠。采用王水沸水浴消解土壤或沉积物试样，方法的检出限为0.01 mg·kg-1(取样量为0.500 0 g，定容体积为50 mL)，检出下限为0.04 mg·kg-1。该方法测定土壤标准样品，测定值都在标准值范围之内，相对误差为-4.7%～-2.0%。该方法用于测定土壤和沉积物实际样品的相对标准偏差分别为2.5%～3.4%和3.1%～3.4%，加标回收率分别为97.6%～102%和99.5%～104%。

Determination of Bi in Soils and Sediments by Atomic Fluorescence Spectrometry

A method for determination of the contents of Bi in soils and sediments by atomic fluorescence spectrophotometry (AFS) was established by using aqua regia as the dissolved medium .In this paper ,the instrument parameters ,load flow and re‐ducing agent concentration were optimized .Compared with microwave digestion and electric heating plate digestion ,water bath digestion demonstrated the better digestion efficiency and was most commonly used .Under the optimal experimental conditions , the detection limit (LOD) was 0.01 mg · kg -1 (sample quantity 0.500 0 g ,sample volume 50 mL) ,and the limit of quantitation (LOQ) was 0.04 mg · kg -1 .The results were in good agreement with the centified value ,and the relative error was -4.7% ~-2.0% .For determination of soil and sediment actual samples ,the relative standard deviation (RSD) were 2.5% ~3.4% and 3.1% ~3.4% ,respectively ,and the recoveries of the method respectively ranged from 97.6% ~102% and 99.5% ~104% .