Statistical Relationship between Selected Physicochemical Properties of Peaty-Muck Soils and their Fraction of Humic Acids

Abstract

A b s t r a c t. Influence of humic acids on soil environment is still subject of scientific discussions. The aim of above studies was to investigate the relationships between selected physicochemical properties of eleven peaty-muck soils and properties of humic acids isolated from these soils. The following parameters were determined for soils: total and organic carbon, density, ash, humification, and the water absorption index. Humic acids were described by: absorbance at 280 nm, absorbance ratios at 465 and 665 nm, at 260 and 665 nm, elemental composition and atomic ratios: H/C, O/H, O/C, C/N, the degree of internal oxidation, and the content of carboxylic and phenolic groups. Statistical analyses showed that an increase in density, humification, and water absorption indices of soils caused a significant increase in the humic acid parameters: absorbance at 280 nm, the oxygen content, O/H, O/C ratios, internal oxidation degree, and functional groups. Statistically significant negative correlations were found for the same parameters of soils and for the hydrogen and carbon content as well as the H/C ratio of humic acids. The relationships showed that there was a possibility to express the properties of humic acids on the basis of more simple parameters measured for soil and without time-consuming isolation of humic acids.K e y w o r d s: organic soils, humic acids, humification

Interactions of Zn(II) Ions with Humic Acids Isolated from Various Type of Soils. Effect of pH, Zn Concentrations and Humic Acids Chemical Properties

“…The peak at 1598–1645 cm −1 can also be partly explained by C = C stretching in aromatic rings [ 5 , 37 ]. Protonated carboxylic groups (COOH) evoke the signal from asymmetric and symmetric stretching vibrations of C = O in COOH in two areas: as the shoulder at ~1710 cm −1 and as a weak band at 1210–1267 cm −1 , respectively [ 38 ]. The shoulder/small peak appearing at 1513–1552 cm −1 can be assigned to amides and C = C stretching in aromatic rings [ 36 ].…”

Soil Water Content and Temperature Dynamics under Grassland Degradation: A Multi-Depth Continuous Measurement from the Agricultural Pastoral Ecotone in Northwest China

“…According to the United States Department of Agriculture soil texture classification criteria [42], the soil was divided into clay (particle size < 2 µm), silt (particle size 2 µm-50 µm), and sand (particle size 50 µm-2000 µm). Soil organic carbon was determined by the carbon analyzer, HT 1300 (Analytik, Jena, Germany) [43].…”

Effects of selected chemical and physicochemical properties of humic acids from peat soils on their interaction mechanisms with copper ions at various pHs

“…Thus together with the low pH typical of these soils, the HA content and state can markedly influence the behavior of Cu Sokołowska, 2013a, 2013b). Furthermore, the ascertained significant variability of physicochemical properties of organic soils is known to affect the properties of their HAs (Boguta and Sokołowska, 2014), which, in turn, is expected to affect the mechanisms of interaction between HAs and Cu(II) ions.…”