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1 Cofie, Olufunke; Pleysier, J. 2004. Ion exchange involving calcium-potasium (Ca-K) and calcium-magnesium (Ca-Mg) in soil and organic matter fractions. Communications in Soil Science and Plant Analysis, 35(17-18):2417-2431.
Ion exchange ; Soil properties ; Soil organic matter ; Clay ; Fractionation ; Calcium ; Magnesium ; Potassium / Nigeria
(Location: IWMI-HQ Call no: IWMI 631.4 G000 COF Record No: H035917)
The chemical characteristics of two soil types, an Alfisol and an Ultisol, were studied in the humid tropical zone of southern Nigeria. The objective was to investigate the contribution of soil organic matter (SOM) to nutrient retention characteristics and identify those SOM pools that contribute most to the ion exchange properties of the soils. Ion exchange studies involving K-Ca and Mg-Ca systems in whole soil, organic fraction (53-250 mm) and clay fraction (<2 mm ) showed a preference for Ca relative to K in the soil and organic fraction. For the clay fraction in Alfisol, the isotherm in K-Ca system suggested a preference for K at low K saturation, but from about 50% K saturation, the isotherm inferred a preference for Ca. However, the overall selectivity at constant temperature and pressure as expressed by Gibb’s free energy change suggested a stronger binding of K than Ca by the fraction.
2 Rajakaruna, R. M. P.; Nandasena, K. A.; Jayakody, A. N. 2005. Quality of shallow groundwater in an intensively cultivated hilly catena in up country intermediate zone of Sri Lanka. In Galagedara, L. W. (Ed.). Water resources research in Sri Lanka: Symposium Proceedings of the Water Professional’s Day 2005. Peradeniya, Sri Lanka: PGIA. pp.163-178.
Groundwater ; Water quality ; Calcium ; Magnesium ; Nitrogen ; Sodium ; Potassium ; Phosphorus ; Monitoring ; Analysis ; Irrigation water ; Drinking water ; Domestic water ; Wells ; Water pollution ; Fertilizers ; Vegetables ; Cultivation / Sri Lanka / Badulla / Hulankapolla Village
(Location: IWMI HQ Call no: IWMI 631.7 G744 GAL Record No: H040714)
3 Arasalingam, Sutharsiny; Pathmarajah, S.; Mikunthan, T.; Vithanage, M.; Manthrithilake, Herath. 2013. Impact of agricultural activities on groundwater quality and its suitability for drinking in Valikamam area, Jaffna Peninsula. In Sri Lanka Water Partnership (Lanka Jalani); International Water Management Institute (IWMI); Unilever-Pureit. Proceedings of the First Young Water Professionals Symposium, Colombo, Sri Lanka, 22-23 November 2012. Colombo, Sri Lanka: Sri Lanka Water Partnership (Lanka Jalani); Colombo, Sri Lanka: International Water Management Institute (IWMI); Colombo, Sri Lanka: Unilever-Pureit. pp.74-81.
Groundwater resources ; Drinking water ; Water quality ; Agricultural production ; Wells ; Aquifers ; Fluorides ; Nitrates ; Chlorides ; Calcium ; Magnesium ; Carbonates ; Bicarbonates ; Sodium ; Potassium / Sri Lanka / Jaffna Peninsula / Valikamam / Chunnakam aquifer
(Location: IWMI HQ Call no: 333.91 G744 SRI Record No: H046158)
http://lankajalani.org/wp-content/uploads/2015/03/Proceedings-YWPS.pdf
https://vlibrary.iwmi.org/pdf/H046158.pdf
https://vlibrary.iwmi.org/pdf/H046158.pdf
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