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2001: N Li; Hian Kee Lee
Assessment of colloid formation and physical state distribution of trace polycyclic aromatic hydrocarbons in aqueous samples.
Analytical chemistry 2001;73(21):5201-6.
2001: N Li; Hian Kee Lee
Solid-phase extraction of polycyclic aromatic hydrocarbons in surface water. Negative effect of humic acid.
Journal of chromatography. A 2001;921(2):255-63.
2000: N Li; Hian Kee Lee
Tandem-cartridge solid-phase extraction followed by GC/MS analysis for measuring partition coefficients of association of polycyclic aromatic hydrocarbons to humic acid.
Analytical chemistry 2000;72(21):5272-9.
2000: N Li; Hian Kee Lee
Sample preparation based on dynamic ion-exchange solid-phase extraction for GC/MS analysis of acidic herbicides in environmental waters.
Analytical chemistry 2000;72(14):3077-84.