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Movement of Manganese‐54 in Calcareous Soils as Affected by Leaching Solution, Lime Content, Salinization, and Sterilization
Author(s) -
Fahad A. A.
Publication year - 1987
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1987.03615995005100060016x
Subject(s) - leaching (pedology) , lime , loam , manganese , soil water , calcareous , chemistry , effluent , leaching model , environmental chemistry , soil salinity , soil science , geology , environmental science , environmental engineering , paleontology , organic chemistry
Movement of 54 Mn was investigated in calcareous soil columns (untreated, partially depleted lime, salinized, and sterilized) leached with 0.05 mol CaCl 2 L −1 followed by 0.03 mol EDTA L −1 (ethyle‐nediaminetetraacetic acid). Manganese was monitored along the soil columns using gamma spectrometry and measured in the effluent during the leaching course (80–120 d). Results indicated that the leaching with CaCl 2 for 45 d left 63, 32, and 10% of the applied Mn in the upper 0.5 cm of the silty clay, loam, and loamy sand soils, respectively, with no Mn detected below 5.0 cm. Conversely, leaching with EDTA for 4 d resulted in a nearly uniform distribution of Mn in the 20‐cm soil columns. The various soil treatments caused a reduction in the retention capacity of the three soils for Mn with the maximum reduction occurring in the soils with partially depleted lime. In most cases, leaching with CaCl 2 for 45 d produced no Mn in the column effluent except negligible amounts of Mn that were displaced from the sterilized and 50 g lime kg −1 columns. On the other hand, Mn emerged in the effluent immediately after EDTA application and continued until the end of the leaching course. The shape and the position of the breakthrough curves varied depending on the specific soil treatment.