Frank S. C. Lee

TL;DR: In this paper, a pyrolysis unit was coupled to an atomic absorption spectrometer for the determination of mercury in solid samples of Chinese medicinal materials (CMMs), this highly sensitive analytical technique provides a simple and rapid method for the screening of Hg in CMM samples including raw herbs, mineral drugs and their derived formulated products.

TL;DR: In this article, the authors investigated the leaching properties of heavy metals (As, Hg) leachable from Chinese medicinal materials (CMM) under conditions simulating stomach and intestine digestion and absorption.

TL;DR: In this paper, a derivatization-GC/ECD analytical method has been developed, which involves first the reduction of nitrated polynuclear aromatic hydrocarbons (NPAHs) to their corresponding amino PAHs by NaBH4.

TL;DR: The sensitivity and reproducibility of GC/negative ion chemical ionization MS (NICIMS) for the measurement of NPAHs after derivatization has been evaluated and has sensitivity comparable to GC/ECD, but is less reproducible in quantification.

TL;DR: In this article, multiresolution analysis (MA) based on orthogonal wavelet bases is introduced to remove the influence of complex backgrounds and furthermore to correctly determine the number of components in a system.