Competence Center Engineering & Maintenance, BASF SE, 67056 Ludwigshafen/Rhein, Germany.
Anal Bioanal Chem. 2012 Mar;402(8):2669-74. doi: 10.1007/s00216-011-5625-8. Epub 2011 Dec 21.
Open-loop stripping analysis (also referred to as dynamic headspace) is a very flexible and robust technology for online monitoring of volatile organic compounds in wastewater or coolant. However, the quality and reliability of the analytical results depend strongly on the temperature during the stripping process. Hence, the careful and constant heating of the liquid phase inside the stripping column is a critical parameter. In addition, this stripping at high temperatures extends the spectrum of traceable organics to less volatile and more polar compounds with detection limits down to the ppm-level. This paper presents a novel and promising approach for fast, efficient, and constant heating by the direct injection of process steam into the strip medium. The performance of the system is demonstrated for temperatures up to 75 °C and traces of various hydrocarbons in water (e.g., tetrahydrofuran, methanol, 1-propanol, n-butanol, ethylbenzene).
开环吹扫分析（也称为动态顶空）是一种非常灵活和强大的技术，可用于在线监测废水中或冷却剂中的挥发性有机化合物。然而，分析结果的质量和可靠性强烈依赖于吹扫过程中的温度。因此，仔细且恒定地加热吹扫柱内的液相是一个关键参数。此外，这种高温吹扫将可追踪有机物的范围扩展到挥发性更低、极性更强的化合物，检测限可达 ppm 级。本文提出了一种新颖且有前途的方法，通过将工艺蒸汽直接注入吹扫介质中，实现快速、高效和恒定的加热。该系统的性能在高达 75°C 的温度下以及水中各种烃类（例如四氢呋喃、甲醇、1-丙醇、正丁醇、乙苯）的痕量条件下得到了验证。
