白油中存在着单环芳烃和多环芳烃物质,其吸收光谱相互重叠,在测定波长260～300 nm范围内,采用偏最小二乘回归(PLS)法同时测定白油中单环芳烃和多环芳烃的含量,当残差平方和PRESS达到最小值时,确定PLS回归中二组分的主成分数均为4,分析结果表明,样品中单环芳烃和多环芳烃的回收率在93.73%～101.31%,线性范围分别在0.99×10-1～5.05×10-1mg/g和0.47×10-1～2.47×10-1mg/g之间,取得了满意的分析结果。 The white oil contains monocyclic aromatic hydrocarbons (PAHs) and polycyclic aromatic hydrocarbons (PAHs), whose absorption spectra overlap with each other. The partial least squares regression (PLS) When the residual sum of squares and PRESS reached the minimum value, the main components of the two components in the PLS regression were all determined to be 4. The analysis results showed that the recovery rates of monocyclic aromatic hydrocarbons and polycyclic aromatic hydrocarbons in the samples were between 93.73% ~ 101.31%. The linear range was 0.99 × 10-1 ~ 5.05 × 10-1mg / g and 0.47 × 10-1 ~ 2.47 × 10-1mg / g, respectively. Satisfactory analytical results were obtained.