直接进样-冷原子吸收光谱法测定润滑油中汞

CV-AAS Determination of Mercury in Lubrication Oil with Direct Sample Introduction

将直接进样技术应用于冷原子吸收光谱法测定润滑油中汞含量,以防止常规酸消解样品时造成的汞损失。适宜的取样量为0.1 g,选择分解温度为850℃,分解时间为120 s,并在仪器操作时预先设置。汞的质量分别为35 ng以内及35-600 ng之间与其吸光度（峰高）呈线性关系,方法的检出限（3S/N）为0.07 ng。用标准加入法作回收试验,得出回收率在95.0%-102.3%之间,相对标准偏差（n=7）在2.1%-5.3%之间。

Direct sample introduction technique was applied to the CV-AAS determination of mercury in lubrication oil to prevent the loss of mercury during the conventional pretreatment of sample by acid digestion.0.1 g of the oil sample was taken for a determination,and the working conditions of the instrument were optimized and preset as follows： ① decomposition temperature： 850 ℃ and ② decomposition time： 120 s.Linear relationships between values of absorbance（peak height） and mass of mercury were obtained in the ranges of within 35 ng and 35-600 ng.Detection limit（3S/N） found was 0.07 ng.Recovery of the method was tested by the standard addition method,and the results obtained were in the range of 95.0% to 102.3%,with values of RSD′s（n=7） ranged from 2.1% to 5.3%.