草本植物
发表于 2025-3-25 03:43:49
Factors to be considered in the isolation and characterization of aquatic humic substances,sure filtration to remove suspended sediment, sorption of humic substances onto XAD-8 resin at pH 2, desorption of humic substances in base, fulvic/humic separation at pH 1, desalting on XAD-8 resin, hydrogen saturation on cation exchange resin, and freeze-drying. Careful attention must be given to
气候
发表于 2025-3-25 09:46:37
Structural features of aquatic fulvic acids by analytical and preparative HPLC followed by spectrosrray UV-Vis, and fluorescence detectors were used to monitor the HPLC separation. Preparative FA fractions were subjected to .H and .C solid state NMR, FT-IR, and ESR. The preparative and analytical RP-HPLC separations have shown that the FA macromolecule consists of at least two polymeric fractions
Medicare
发表于 2025-3-25 12:18:44
Fluorescence spectroscopy as a means of distinguishing fulvic and humic acids from dissolved and seinvestigated by fluorescence spectroscopy in the emission, excitation and, partly, synchronous scan excitation modes. Emission spectra are generally characterized by a unique broad band, whereas excitation spectra exhibit a variable number of peaks or shoulders of various intensity; these peaks are
Foreknowledge
发表于 2025-3-25 19:48:35
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恶心
发表于 2025-3-25 23:13:00
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prick-test
发表于 2025-3-26 03:01:49
Investigation of humic acid samples from different sources by photon correlation spectroscopy,soil, lake and groundwater humic and fulvic acids, as well as in natural waters of high humic content, but absent in ‘synthetic’ humic acid. The influence of ionic strength, Ca(II), La(III), EDTA, fluoride ions, surfactants, and ultrasound on size and zeta potential of these scatterers has also been
excrete
发表于 2025-3-26 07:59:38
The behaviour of diborane-reduced fulvic acids in flash pyrolysis,arboxyl groups in the behaviour of these substances in flash pyrolysis. In the preliminary results shown in this communication, pyrograms of two fulvic acids of different origins and the corresponding diborane reduced substances are compared. It was found that the diborane reduction was responsible
颠簸地移动
发表于 2025-3-26 08:30:30
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Externalize
发表于 2025-3-26 15:54:33
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Generator
发表于 2025-3-26 20:28:00
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