John J. Langenfeld

Effects of temperature and pressure on supercritical fluid extraction efficiencies of polycyclic aromatic hydrocarbons and polychlorinated biphenyls

John J. Langenfeld, Steven B. Hawthorne, David J. Miller et al. · Analytical Chemistry · 1993 · 280 citations

Engineering, Chemical Engineering, Chemistry +14

Quantitative Analysis of Fuel-Related Hydrocarbons in Surface Water and Wastewater Samples by Solid-Phase Microextraction

John J. Langenfeld, Steven B. Hawthorne, David J. Miller · Analytical Chemistry · 1996 · 209 citations

Natural Sciences, Environmental Engineering, Environmental Sciences +11

Role of Modifiers for Analytical-Scale Supercritical Fluid Extraction of Environmental Samples

John J. Langenfeld, Steven B. Hawthorne, David J. Miller et al. · Analytical Chemistry · 1994 · 202 citations

Natural Sciences, Chemistry, Environmental Sciences +10

A model for dynamic extraction using a supercritical fluid

Keith D. Bartle, Anthony A. Clifford, Steven B. Hawthorne et al. · The Journal of Supercritical Fluids · 1990 · 200 citations

Engineering, Mechanical Engineering, Physics +11

PM-10 high-volume collection and quantitation of semi- and nonvolatile phenols, methoxylated phenols, alkanes, and polycyclic aromatic hydrocarbons from winter urban air and their relationship to wood smoke emissions

Steven B. Hawthorne, David J. Miller, John J. Langenfeld et al. · Environmental Science & Technology · 1992 · 172 citations

Natural Sciences, Chemistry, Environmental Sciences +17