Abstract
A laboratory study was conducted to determine sodium desorption behavior from exchange positions of soil solid phase because of a quiet water flow. Using sulfuric water collected from a sulfuric spring and a chlorine water from Tigris river. The flow was through two disturbed soil columns. Soils were sampled from Fadhlia and Hamdania locations in Nineveh province/ northern Iraq. Waters flow were persisted for 240 minutes with 4 cm highness over soils surface was maintained. Leachates were collected every 10 minutes for a total ten extracts which analyzed for Na+. Three mathematical kinetic description were considered as an accumulative soluble Na+, Na+ expressed by SAR and ESP concepts , sequences as parabolic diffusion, zero order, 1st order, Elovitch and power function (poly ordered) models were applied. Mathematical descriptions revealed succession of 1st order and power function models. Na+ desorption coefficient rate values by 1st order model were ranged from 96 ×10-3 - 185 × 10-3 minute for chlorine water, for sulfuric water were from 10 ×10-3 - 34×10-3 minute for both locations respectively, while desorption coefficient rate values according to power function model were 686 ×10-3 , 683×10-3 , 634×10-3 mg.kg-1.min..-1 respectively. Results referred also that Na+ desorption coefficient rate values was proportionally increased with waters ionic strength.
Highlights
A laboratory study was conducted to determine desorption behavior of Ca+2 and Mg+2 from of solid phase and dissolution of their holding minerals by using quiet water flow of different ionic strength and SAR constructed by miscible displacement technique via two Aridisols disturbed soil columns sampled from Fadhlia and Hamdania locations in Nineveh province northern of Iraq for 10 irrigation cycles elongated for 240 minute, and to determine Ca+2&Mg+2 and desorption coefficient rates at 298 ̊ Kelvin
Highest desorption coefficient rate 35.51 mg. kg-1.mint-1⁄2 in Fadhlia location for water of high ionic strength while it reduced to 2.225 mg. kg-1.mint-1⁄2 for low water ionic strength
Desorption coefficient rate in Fadhlia was higher than that in Hamdania location due to difference of waters ionic strength
Summary
A laboratory study was conducted to determine desorption behavior of Ca+2 and Mg+2 from of solid phase and dissolution of their holding minerals by using quiet water flow of different ionic strength and SAR constructed by miscible displacement technique via two Aridisols disturbed soil columns sampled from Fadhlia and Hamdania locations in Nineveh province northern of Iraq for 10 irrigation cycles elongated for 240 minute, and to determine Ca+2&Mg+2 and desorption coefficient rates at 298 ̊ Kelvin.
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