Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Surface Activity of Humic Acid and Its Sub-fractions from Forest Soil

Version 1 : Received: 28 June 2021 / Approved: 29 June 2021 / Online: 29 June 2021 (12:44:24 CEST)

A peer-reviewed article of this Preprint also exists.

Tian, S.; Tan, W.; Wang, X.; Li, T.; Song, F.; Huang, N.; Bai, Y. Surface Activity of Humic Acid and Its Sub-Fractions from Forest Soil. Sustainability 2021, 13, 8122. Tian, S.; Tan, W.; Wang, X.; Li, T.; Song, F.; Huang, N.; Bai, Y. Surface Activity of Humic Acid and Its Sub-Fractions from Forest Soil. Sustainability 2021, 13, 8122.

Journal reference: Sustainability 2021, 13, 8122
DOI: 10.3390/su13158122

Abstract

Surface activity of humic acid (HA) and its six sub-fractions isolated from forest soil were characterized by surface tension measurements, dynamic light scattering, and laser doppler electrophoresis. The surface tension of HA sub-fractions decreased from 72.4 mN·m-1 to 36.8 mN·m-1 with the increasing concentration from 0 to 20000 mg·L-1. The critical micelle concentration (CMC) of HA and its sub-fractions ranged from 216 to 1024 mg·L-1 with the multiple linear regression equation of CMC = 18896–6.9×C–296×alkyl-C–331×aromatic-C–17019×H/C+4054×HB/HI (p < 0.05). The Z-average particle size ranges from 108.2 nm to 186.9 nm. The maximum particle size was 5000 nm after filtered with a membrane of 0.45 μm, indicating HA and its sub-fractions progressed self-assembly during 2000 mg·L-1, pH = 6.86. The number-base particle size distribution of HA sub-fractions was identified as four peaks by Gaussian model, and the aggregate sizes were mainly in six clusters including 2 ± 1 nm, 5 ± 2 nm, 10 ± 3 nm, 21 ± 8 nm, 40 ± 10 nm, and > 50 nm indicating multiple aggregations of different particle sizes in the HA fractions solution.

Subject Areas

Humic acid; Surface tension; CMC; Gaussian model

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.