Abstract
The organic macromolecules in total suspended particulate (TSP) are complex and have not been thoroughly investigated. In this article, six composite TSP samples were collected from urban, suburban, and forest sites of Guangzhou. Organic macromolecules in the TSP were separated into humic acids (HA), kerogen and black carbon (KB), and black carbon (BC) by chemical treatment with sodium hydroxide, hydrochloric acid/hydrofluoric acid, and potassium dichromate/sulfuric acid. Note that the BC isolated is part of KB. To obtain sufficient amounts of HA, KB, and BC for subsequent analyses, 1.5 g TSP were used for each sample. The isolated fractions were characterized by elemental analysis, solid-state 13C crosspolarization and magic angle spinning nuclear magnetic resonance spectroscopy, Fourier transformed infrared spectroscopy, stable carbon isotopic ratio, and radiocarbon ratio mass spectrometry. Total carbon content in TSP ranged from 12.8 to 19.0%, and HA, KB, and BC were accounted for 2.39–14.8, 37.4–53.5,...
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