该方法用于测定碳氢化合物中的总正构烷烃（TNP）和单个正构烷烃，例如UOP Molex工艺流，包括含有Molex工艺的样品。样品通常在C8至C20碳数范围内。通过预热样品并添加合适的溶剂，范围可扩展至C40。高浓度和低浓度下的质量-%TNP倾向于略微偏高，因为正常石蜡部位的非正常物质补偿不完全。 使用UOP方法411，预计TNP值会略为准确（见注释）。任何化合物的检测下限为0.01%（质量%）。

This method is for determining total normal paraffins (TNP) and individual normal paraffins in hydrocarbons, such as the UOP Molex process streams, including samples containing the Molex process desorbent. Samples are typically in the C8 to C20 carbon number range. By preheating the sample and adding a suitable solvent, the range can be extended up to C40. The mass-% TNP at the high and low concentrations tend to be biased slightly high because of incomplete compensation for non-normals at the normal paraffin sites. A slightly more accurate TNP value would be expected using UOP Method 411 (see NOTE). The lower limit of detection is 0.01 mass-% for any compound.