火焰原子吸收光谱法测定汽油中铁镍铜

Determination of iron,nickel and copper in gasoline by flame atomic absorption spectrometry

用碘-二甲苯溶液对汽油进行氧化处理,硝酸(1+9)萃取,以原子吸收光谱法测定汽油中铁、镍、铜。铁、镍、铜的测定波长分别为248.3nm,232.0nm,324.8nm;检出限分别为0.0005μg/mL,0.0004μg/mL,0.0001μg/mL;工作曲线的线性范围为0.002～40.00μg/mL,0.001～50.00μg/mL,0.001～6.00μg/mL。对氧化剂、萃取剂的浓度及用量进行了试验,选择了最佳萃取时间。汽油中对被测元素有干扰的元素均在允许量范围内。方法用于汽油样品的分析,铁、镍、铜的相对标准偏差分别小于2.92%,2.94%,3.18%,回收率在98.5%～102.5%之间。

The gasoline sample was oxidized using iodine-xylene. After extraction with nitric acid （9＋ 1） ,iron, nickel and copper in gasoline were determined by atomic absorption spectrometry. The wavelengths of determining iron, nickel and copper were 248.3 nm, 232.0 nm and 324. 8 nm, respectively. The detection limits were 0. 000 5μg/mL, 0. 000 4 μg/mL and 0. 000 1μg/mL, and the linear ranges were 0. 002-40. 00μg/mL, 0. 001--50.00μg/mL, 0. 000 1--6.00 μg/mL,respectively. The test for the concentration and dosage of oxidizer and extractant were carried out and the optimal extraction time was selected. The other elements in gasoline were all in tolerable amount ranges. The method has been applied for the determination of iron, nickel and copper with the relative standard deviations of less than 2.92%,2. 94%,3. 18%respectively, and the recovery of 98.5%-102.5%.