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Alberts, J. J. & Takács, M., 2004a. Total Luminescence Spectra of IHSS standard and reference fulvic acids, humic acids and natural organic matter: Comparison of aquatic and terrestrial source terms. Organic

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, A. , Kaynar , D. , Turan , M. , Ercişli , S. ( 2016 ) Ameliorative effect of humic acid and plant growth-promoting rhizobacteria (PGPR) on Hungarian vetch plants under salinity stress . Commun. Soil Sci. Plant Anal. 47 , 602 – 618

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Abstract  

In this work, sorption of Ni(II) from aqueous solution to goethite as a function of various water quality parameters and temperature was investigated. The results indicated that the pseudo-second-order rate equation fitted the kinetic sorption well. The sorption of Ni(II) to goethite was strongly dependent on pH and ionic strength. A positive effect of HA/FA on Ni(II) sorption was found at pH < 8.0, whereas a negative effect was observed at pH > 8.0. The Langmuir, Freundlich, and D-R models were applied to simulate the sorption isotherms at three different temperatures of 293.15 K, 313.15 K and 333.15 K. The thermodynamic parameters (ΔH 0, ΔS 0 and ΔG 0) were calculated from the temperature dependent sorption, and the results indicated that the sorption was endothermic and spontaneous. At low pH, the sorption of Ni(II) was dominated by outer-sphere surface complexation or ion exchange with Na+/H+ on goethite surfaces, whereas inner-sphere surface complexation was the main sorption mechanism at high pH.

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. K OGLIN , E. , M EIER , R. J. & V EREECKEN , H. , 2006 . Molecular characterisation of the bonding of herbicide metabolites to humic acid . Journal of Molecular Structure: THEOCHEM . 759 . 133 – 13

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physicochemical characteristics of humic acids extracted from compost, soil and amended soil . Talanta . 69 . 1234 – 1239 . C HRISTENSEN , H. R. & J ENSEN , S. T. , 1926 . On the

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Abstract  

The effect of humic acid addition on the capacity of inorganic sorbents to sorb radioactive cesium and strontium was studied on montmorillonites in a calcium and potassium form. The Sips isotherm for humic acid sorption and multisite distribution model of ion sorption was found to suit well for the description of mobility of ions as a function of equilibrium humic acid concentration as a single variable at given pH and type of silicate. Complexation of the ions was of minor importance at the conditions investigated. Influence of humic acid on the specific radiocesium interception potential (SRIP) was also evaluated.

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