This study investigated the partitioning behavior of dissolved organic matter (DOM) in liquid and ice phases, as well as the changes in the optical properties and chlorine reactivity of DOM during the freezing processes of water. DOM was rejected from the ice phase and accumulated in the remaining liquid phase during water freezing. Moreover, the decrease in freezing temperature, as well as the...

Fulvic acids from deep clay formations have been isolated by the International Humic Substances Society (IHSS) standard protocol and analyzed. Near edge X-ray absorption fine structure (NEXAFS) spectroscopy reveals, that the basic structural features relating to the origin of the clay organic matter (i.e., terrestrial or marine) are preserved even after the around 150 Ma since deposition (Juras...

Humic acid (HA) is a kind of organic substance that has shown good effects in regard to promoting crop growth. In the current study, influences three kinds fertilizers mainly containing humic/fulvic acids, including water-soluble fertilizer humic (WHA), fulvic potassium (FAP), and distillate (FAD), on qualities ‘Eureka’ lemon fruits were investigated systematically at their different harvest ti...

Two soil humic acids (HA), a marine sediment HA, and a soil fulvic acid (FA), were fractionated by polyacrylamide gel electrophoresis in the presence of denaturing agents before and after 6N HCl hydrolysis. After acid hydrolysis, the intensity of the high molecular size (MS) fraction decreased considerably in all HAs. On the other hand, a new high-MS fraction appeared in the FA after hydrolysis...

Pyrograms of Ihree fulvic acids (FAs) or ditferenl origins and Ihe corresponding pyrosrams obtaincd by reactive pyrolysis wilh Iclramclhylammonium hydroxide (TMAH) are compared. Thi! proc.cdure inlroduces bolh slriking qualilalive and quanlilalive changes in lhe pyrolylic pallems of Ihe FAs. which are discussed in lerms of Ihe usefulness of Ihis approach lo slructural sludies. Sorne non·pyrolys...

We report development of a novel parameter for quantifying the amount of humic and fulvic acids per unit surface area in a particular soil. This quantity, the "humic coverage index" (HCI), provides a measurement of the relative spatial extents and/or thicknesses of the humic/fulvic overlayers in different soils, and, therefore, can be used in modeling various soils' behavior in sequestration pr...