该方法用于通过微波消解和电感耦合等离子体质谱（ICP-MS）测定液体有机物和重质石油馏分中的总痕量砷。砷的定量下限为5 ng/g（质量ppb）。通过常规提取和消化（如UOP 946方法中使用的方法）制备样品，通过HG-AAS测定石油石脑油中的砷，非常耗时，而且对于高沸点样品来说是有问题的，因为在所需的极端样品制备条件下，砷可能挥发。UOP 986方法——使用微波消解和石墨炉原子吸收法测定重质石油馏分中的砷——使用微波消解，但由于GF-AAS的灵敏度限制，必须结合多次消解进行分析。表1显示了这些方法的比较

This method is for determining total trace arsenic in liquid organics and heavy petroleum fractions by microwave digestion and Inductively Coupled Plasma - Mass Spectrometry (ICP-MS). The lower limit of quantitation for arsenic is 5 ng/g (mass-ppb).Sample preparation by conventional extraction and digestion, such as that used in UOP Method 946, Arsenic in Petroleum Naphthas by HG-AAS, is time consuming and is problematic for high-boiling samples as it is possible for arsenic to be volatilized at the extreme sample preparation conditions required. UOP Method 986, Arsenic in Heavy Petroleum Fractions using Microwave Digestion and Graphite Furnace-AAS, uses microwave digestion, however due to sensitivity limitations of the GF-AAS, multiple digestions must be combined for analysis. A comparison of the methods is shown in Table 1