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Vol. 28 No. 10 (2016): Vol 28 Issue 10

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Sorption-Desorption of Phosphate on Soils of Kohora Watershed of Assam, India

https://doi.org/10.14233/ajchem.2016.19883
K.N. Das*
Department of Soil Science, Assam Agricultural University, Jorhat-785 013, India *Corresponding author: E-mail: daskn388@gmail.com
Seema Bhagowati
Department of Soil Science, Assam Agricultural University, Jorhat-785 013, India *Corresponding author: E-mail: daskn388@gmail.com

Asian Journal of Chemistry, Vol. 28 No. 10 (2016): Vol 28 Issue 10

Abstract

Phosphate adsorption and desorption characteristics in soils of a toposequence of Kohora watershed of Assam, India were comparatively investigated by short-term isotherm batch experiments using phosphate concentrations (0-200 mg P kg-1) in 0.01M CaCl2. Sorption isotherms showed better conformity to two surface Langmuir equation (R2 = 0.989**-0.999**), than Freundlich (R2 = 0.988**-0.999**) followed by one surface Langmuir equation (R2 = 0.877* -0.997** and Temkin equations (R2 = 0.826*-0.942**). Phosphate adsorption maxima (Qm) followed the order: medium land > flatter land > hillock top > flat land > middle slope > lowland > lower slope. In Langmuir isotherms adsorption maxima varied from 26.41 to 53.10 mg kg-1 in region-I (Qm1, high energy sites) and from 1853.62 to 2550.82 mg kg-1 in region II (Qm2 low energy sites) contributing 1.3 to 2 % and 98.0 to 98.7 %, respectively to total adsorption maxima. Incongruent values of bonding energy constant (k1, k2) indicated greater tenacity for phosphate in region I possibly due to larger iron and aluminium oxides (r = 0.933**). The Qm for both the regions were significantly correlated with Ald, Fed and Fe2O3+Al2O3 and the correlation was comparable with Freundlich K endorsing Fe and Al oxides as the dominant adsorbent of phosphate in these soils. The desorption percentage of adsorbed phosphate followed almost the same trend as phosphate adsorbed, in order are lower slope (26 %) > upper slope (21 %) = flat land (21 %) > crest (20 %) = low land (20 %) > mid slope (19 %) > upland (14 %) > medium land (8 %). The standard phosphate requirements (phosphate adsorbed at 0.2 mg P L-1) ranged from 128.8 to 225 mg P kg-1. The results also suggested that phosphate buffering capacity of these soils related to adsorption maxima which in turn associated to Fe2O3 + Al2O3 (r = 0.808*).

Keywords

Phosphate Adsorption-desorption Watershed toposequence Phosphate buffering capacity.
Das*, K., & Bhagowati, S. (2016). Sorption-Desorption of Phosphate on Soils of Kohora Watershed of Assam, India. Asian Journal of Chemistry, 28(10), 2111–2121. https://doi.org/10.14233/ajchem.2016.19883
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