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选择SH/T 0689—2000紫外荧光法和GB/T 11140—2008波长色散X射线荧光光谱法作为测定依据进行检测实验,对各种影响汽油硫含量检测结果的因素进行分析。分析结果表明,当裂解温度在1000~1050℃之间时,标样回收率无限接近100%,即测量结果无限接近真实值;裂解氧气及载气氩气流量过大或过小,都会导致检测结果偏离真实值;不同浓度的样品,其进样量的多少会直接影响测试结果的准确性,对硫含量低的样品可适当加大进样量,而硫含量高的样品应适当减小进样量,同时进样速度的快与慢也会影响检测结果的准确性;当硫含量低于40mg/L(约为54μg/g)时应选择标准曲线0-30-50;采用GB/T 11140—2008测定硫含量时不受碱性氮的影响,而SH/T 0689—2000在相同检测条件下,不同检测仪器的检测结果不同,尤其是针对国Ⅴ汽油的检测。鉴于此,在选择检测方法时应避开氮元素对检测结果的影响,建议采用GB/T 11140—2008标准作为国Ⅳ、国Ⅴ汽油硫含量检测的仲裁方法。
Select SH / T 0689-2000 UV fluorescence and GB / T 11140-2008 wavelength dispersive X-ray fluorescence spectrometry as the basis for determination of the test, the various factors that affect the test results of gasoline sulfur content were analyzed. The results show that when the pyrolysis temperature is between 1000 and 1050 ℃, the standard recovery rate is infinitely close to 100%, that is, the measurement result is infinitely close to the true value. The pyrolysis oxygen and carrier gas argon flow rate is too large or too small, The results deviate from the true value; different concentrations of the sample, the amount of injection will directly affect the accuracy of the test results for samples with low sulfur content may be appropriate to increase the injection volume, and high sulfur content of the sample should be appropriately reduced The sample volume and injection speed will also affect the accuracy of the test results. When the sulfur content is less than 40mg / L (about 54μg / g), the standard curve should be selected 0-30-50. The GB / T 11140-2008 Determination of sulfur content is not affected by the impact of basic nitrogen, and SH / T 0689-2000 under the same test conditions, different detection instruments test results are different, especially for the national Ⅴ gasoline detection. In view of this, in the choice of detection methods should avoid the impact of nitrogen on the test results, the proposed GB / T 11140-2008 standard as the country Ⅳ, the national sulfur content of gasoline detection arbitration methods.