Electro-chemical charge characteristics of surface-subsurface region of selected soils in the tropics

Year 2020, , 60 - 65, 01.01.2020

Sourav Kumar Khan Sanjib Kar

https://doi.org/10.18393/ejss.644050

Cited By: 1

Abstract

A
study was conducted to investigate the relation between soil chemical,
mineralogical properties and surface charge characteristics of selected
tropical soils in West Bengal, India. The objectives of this study were to
analyse the electro-chemical charge characteristics of surface-subsurface soils
in accordance with point of zero charge (PZC) and pH-dependent charge.
Subsoil’s generally have higher PZC than corresponding surface horizons and
pH-dependent surface charges are maximum in upper layer than that of other.
Relatively lower value of PZC (or pH₀) along the depth, mostly
affected by organic matter, clay content free Fe and Al oxides. Result shows
that PZC (or pH₀) values decrease with increasing organic matter
content and increase with increase in sesquioxides content. The PZC of the
charge-pH curves in Diamond Harbour soil (DH) (0-45cm) was on the acid side of
the zero point titration indicate that the samples possess permanent negative
charge and in Raigunj soil (RG) (30-45cm) was on basic side possess slight
permanent positive charge. Amount of surface charge reduces along the depth (subsurface
region) than corresponding surface region except in RG (30-45cm) due to
considerable increase in positive charges by presence of various electrolyte or
synthetic hematite as α-Fe₂O₃. PZC has the strong
negative correlation with pH-dependent charge (r= -0.85707*) that supports the
superiority of the present study. Regression value also supports the strong
dependency of electrochemical surface charge on PZC and organic matter content
of corresponding soil layers (R²= 0.971474).

Keywords

Electro-chemical charge, surface-subsurface, soils, tropics

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