Roles of dissolved humic acid and tannic acid in sorption of benzotriazole to a sandy loam soil.
Antifreeze
Cumulative sorption
Dissolved organic matter
Fractions
Molecular weight
Journal
Ecotoxicology and environmental safety
ISSN: 1090-2414
Titre abrégé: Ecotoxicol Environ Saf
Pays: Netherlands
ID NLM: 7805381
Informations de publication
Date de publication:
Nov 2020
Nov 2020
Historique:
received:
16
04
2020
revised:
24
07
2020
accepted:
27
07
2020
pubmed:
14
8
2020
medline:
21
10
2020
entrez:
14
8
2020
Statut:
ppublish
Résumé
To clarify the role of dissolved organic matter (DOM) in sorption of organic pollutants, batch experiments on effects of two representatives of DOM (dissolved humic acid (HA) and tannic acid (TA)) on sorption of benzotriazole (BTA) to a sandy loam soil were conducted. Both HA and TA promoted BTA sorption to soil. Strong positive correlation between sorbed amount of BTA and DOM confirmed the contribution of cumulative sorption by HA or TA in enhancing BTA binding. TA promoted BTA sorption more obviously than HA by providing more sites. For HA with complex structure composed of heterogeneous fractions, its high molecular weight (>3200 Da) fraction could be preferentially sorbed by soil, and it can enhance BTA sorption more obviously than the low molecular weight fraction. The promoting effect of HA on BTA sorption decreased with pH increasing from 6.5 to 10.5 due to reduced sites and electrostatic repulsion between anionic BTA, HA and soil. Sorption of neutral BTA to soil affected by DOM could be well predicted by a modified Freundlich model with K
Identifiants
pubmed: 32791356
pii: S0147-6513(20)30927-1
doi: 10.1016/j.ecoenv.2020.111088
pii:
doi:
Substances chimiques
Humic Substances
0
Sand
0
Soil
0
Soil Pollutants
0
Tannins
0
Triazoles
0
benzotriazole
86110UXM5Y
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
111088Informations de copyright
Copyright © 2020 Elsevier Inc. All rights reserved.