title: Direct analysis of aqueous samples by matrix-assisted laser desorption ionization mass spectrometry using membrane targets precoated with matrix.
authors.forename: H
authors.initials: H
authors.lastname: Zhang
authors.forename: R M
authors.initials: RM
authors.lastname: Caprioli
mesh_terms: D008567:Membranes, Artificial; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013499:Surface Properties; D014881:Water Supply / Q000032:analysis*
chemical_list: D008567:Membranes, Artificial