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各炼油厂对进厂原油和深加工原料油以及催化剂中的钒都要进行监测,以防止催化剂污染,以免影响产品的产量和质量。测钒的方法大多采用比色法,此法灵敏度低,重现性差。由于钒系难熔元素,石墨炉原子吸收测定具有强烈的记忆效应。本文探讨了石墨炉原子吸收测钒的最佳条件,存选取的条件下,用峰面积测量,变异系数为6.4%,特征质量为18.8pg·0.0044A·s~(-1),检出限为6.9ppb。本法适用于各种原油、350～500℃腊油、>350℃重油、>500℃渣油以及硅铝分子筛催化剂等样品中的微量钒的测定。
Each refinery on-site crude oil and processed feedstock oil and vanadium in the catalyst to be monitored to prevent catalyst contamination, so as not to affect the product yield and quality. Most of the methods of measuring vanadium colorimetry, this method of low sensitivity, poor reproducibility. Due to vanadium-based refractory elements, graphite furnace atomic absorption spectrometry has a strong memory effect. In this paper, graphite furnace atomic absorption spectrometry was used to investigate the optimum conditions for the vanadium measurement. The peak area was used for the determination of vanadium. The coefficient of variation was 6.4%, and the characteristic mass was 18.8pg · 0.0044A · s -1. The detection limit 6.9ppb. This method is applicable to the determination of trace vanadium in various crude oil, 350 ~ 500 ℃ wax oil,> 350 ℃ heavy oil,> 500 ℃ residue and silica-alumina molecular sieve catalyst.