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2013年7-9月在全国8个主要城市及美国加州采集了车用汽油和柴油样品,运用氧弹燃烧-离子色谱法测定了硫含量。该分析方法加标回收率为95%~105%,方法检测限为0.14 mg/kg。分析结果显示所采集的我国市售国Ⅲ、Ⅳ、Ⅴ汽油平均硫含量分别为(72.8±47.2)、(25.9±8.7)、(8.3±1.3)mg/kg,市售国Ⅲ、Ⅳ、Ⅴ柴油平均硫含量分别(146.4±48.8)、(60.6±77.8)、(7.9±1.3)mg/kg,加州汽油和柴油样品平均硫含量分别(11.6±3.0)和(11.4±2.8)mg/kg。所检测的国Ⅲ、国Ⅴ汽油样品和国Ⅳ柴油样品硫含量超标率分别为3.7%、13.3%和28.6%,其余国Ⅳ汽油和国Ⅲ、国Ⅴ柴油硫含量均未超标。北京车用汽柴油平均硫含量低于美国加州,上海和广州车用汽柴油平均硫含量也低于其余城市。
Automobile gasoline and diesel samples were collected from July to September 2013 in eight major cities in the country and in California, USA, and sulfur content was determined by oxygen bomb combustion-ion chromatography. The recovery of this method was 95% ~ 105%. The detection limit was 0.14 mg / kg. The analysis results showed that the average sulfur contents of Ⅲ, Ⅳ and Ⅴ gasoline collected in China were (72.8 ± 47.2), (25.9 ± 8.7) and (8.3 ± 1.3) mg / kg, The average diesel sulfur content was (146.4 ± 48.8), (60.6 ± 77.8) and (7.9 ± 1.3) mg / kg, respectively. The average sulfur content in California gasoline and diesel samples was (11.6 ± 3.0) and (11.4 ± 2.8) mg / kg, respectively. The sulfur content of national Ⅲ, national Ⅴ gasoline samples and national Ⅳ diesel samples tested exceeded the standard by 3.7%, 13.3% and 28.6% respectively. The sulfur content in the remaining countries Ⅳ and Ⅲ and Ⅴ did not exceed the standard. The average sulfur content of Beijing motor gasoline and diesel is lower than that of California and the average sulfur content of gasoline and diesel vehicles in Shanghai and Guangzhou is lower than the rest of the cities.