采用燃烧-灰化法于600 ℃处理废润滑油样品3 h,残渣用盐酸(1+1)溶液溶解后浓缩至1~2 mL,然后用0.1 mol·L-1盐酸稀释定容至25 mL,用电感耦合等离子体原子发射光谱法测定样品中锌、铝、铁、钴、铅、镉、锰、镁、铜、钙、钡和钠的含量.为降低标准溶液的盐效应和测定波长因仪器长时间扫描可能产生的偏差,将这12种金属元素的混合标准溶液分成3组进行配制,测定波长相近的为1组,高浓度元素分散在各组中,测定时亦按这3组分别进行.在选定波长下测定,元素之间基本无干扰.方法已用于报废摩托车润滑油中这12种金属元素的测定,测定值的相对标准偏差(n=6)在1.19%~10.50%之间,加标回收率为92.4%~107.4%.

The used lubrication oil sample was burned in a 100 mL porcelain crucible and then ignited at 600 ℃ for about 3 h.The residue was dissolved in HCl(1+1) and the solution was evaporated to ca.1-2 mL,and diluted to 25 mL in a volumetric flask with 0.1 mol·L-1 HCl,which was used for ICP-AES analysis for its contents of Zn,Al,Fe,Co,Pb,Cd,Mn,Mg,Cu,Ca,Ba and Na.In order to lower the salt effect and to eliminate deviation due to long period of time in wavelength scanning,3 mixed standard solutions containing the 12 metal ions separated in 3 groups.The metal elements having their values of wavelength close to each other were classified into one group and the elements with high contents were distributed into the 3 groups.Sample analysis for the 12 elements was also performed in 3 groups as the mixed standard solutions.Under the specified instrumental conditions,and using the selected analytical spectral lines,no interference was observed among the co-existing elements.Precision of the method was tested,and values of RSD′s (n=6) obtained were in the range of 1.19%-10.50%,and test for recovery by standard addition was performed and results obtained were in the range of 92.4%-107.4%.