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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Sep 2014, 35 (5)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Identification of the solid phase in relation to the solubility of nickel in alluvial soils

 

 

Mandira Barman, S.P. Datta* and R.K. Rattan

Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi-110 012, India

*Corresponding Author E-mail: spdatta.manish@gmail.com

 

 

 

Publication Data

Paper received:

19 March 2013

 

Revised received:

25 September 2013

 

Accepted:

05 October 2013

 

 

Abstract

The chemical equillibria between nickel (Ni) ion present in soil solution and solid phases govern the solubility vis-a-vis availability of Ni in soil. Therefore, stability of various Ni containing minerals in relation to pH was studied to identify the probable solid phases, which govern the solubility of Ni in some alluvial soils under intensive cultivation in and around Delhi. Free Ni2+ activity (pNi2+) as estimated by Baker soil test, ranged from 13.1 to 16.2. Highest free Ni2+ activity (pNi2+ = 13.1) was recorded in industrial effluent irrigated soil collected from Sonepat, Haryana. Free Ni2+ activity was 13.6 in soil collected from agricultural lands of Keshopur, receiving irrigation through sewage effluents. Soils receiving irrigation through tube well water showed relatively lower free Ni2+ activity (pNi2+ = 14.6 to 16.2). Ni-ferrite in equilibrium with Fe(OH)3 (amorphous) is likely to control the activity of Ni in two intensively Ni contaminated soil having pH around 8. Free Ni2+ activity is likely to be buffered by exchangeable Ni in soils having neutral pH. 

 

Key words

Alluvial soil, Nickel, Solubility, Solid phase

 

 

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