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The impact of varying abiotic humification conditions and the resultant structural characteristics on the copper complexation ability of synthetic humic-like acids in aquatic environments

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JournalEcotoxicology and environmental safety
DateAccepted/In press - 12 Sep 2018
DateE-pub ahead of print (current) - 18 Dec 2018
Volume165
Number of pages8
Pages (from-to)603-610
Early online date18/12/18
Original languageEnglish

Abstract

Humic acid (HA) has a high complexation ability with metal ions due to its functional groups. In this study, 11 synthetic humic-like acids (SHLAs) were prepared under varying abiotic humification conditions: precursor species (glycine-catechol and glycine-catechol-glucose), precursor concentrations (from 0.25M:0.25M to 1M:1M), pH (6 - 8), temperature (25 °C - 45 °C) and mass of MnO2 catalyst (1.3-2.5% w/v ). The effect of the varying humification conditions on the complexation ability of the SHLA for Cu2+ were investigated together with the relationships between Cu complexation ability and the structure of the SHLAs (elemental composition, type and content of functional groups, AL/AR, E4/E6). Conditional stability constants (log K) of the SHLAs ranged from 6.00 to 6.42 and complexation capacities ranged from 1.76 mmol/g to 2.61 mmol/g. SHLAs synthesized at lower temperature (25 ℃), pH 8, low precursor concentrations (glycine:catechol= 0.25M:0.25M) and a larger proportion of catalyst (2.5% w/v) had a larger copper complexation ability. Log K values of SHLAs had significant positive correlations with carboxylic carbon (r =0.671, p <0.05), carboxylic group content (r =0.890, p<0.01) and O/C ratio (r =0.618, p <0.05), and significant negative correlations with aliphatic carbon (r = -0.616, p <0.05), total C (r = -0.685, p <0.05) and total H contents (r = -0.654, p<0.05). Complexation capacities had a significant positive correlation with total N (r = 0.826, p <0.01) and a significant negative correlation with C/N ratio (r = -0.823, p <0.01).

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    Research areas

  • abiotic humification, synthetic humic-like acids, metals, copper, complexation ability, structural characteristics

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