Premium
Effect of Small Amounts of Gypsum in Soils on the Solutes in Effluents
Author(s) -
Dutt Gordon R.
Publication year - 1964
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/sssaj1964.03615995002800060023x
Subject(s) - gypsum , effluent , chemistry , soil water , composition (language) , plateau (mathematics) , mineralogy , environmental chemistry , chromatography , soil science , geology , environmental engineering , environmental science , materials science , mathematics , metallurgy , mathematical analysis , linguistics , philosophy
Columns of soil initially containing exchangeable Ca 2+ and 0.0, 0.5, 1.0, and 2.0% CaSO 4 ·2H 2 O by weight were leached with a solution containing 50 me. NaCl and 50 me. MgCl 2 per liter. The effluents from these columns were collected and analyzed for Ca 2+ , Mg 2+ and Na + . The breakthrough curves for Na + were not affected significantly by the presence of gypsum; however, the curves for Mg 2+ were dependent on the amount of CaSO 4 ·2H 2 O present in the system. When small amounts of gypsum were present, Mg 2+ concentration in the effluent increased and then leveled off at some concentration below that of the solution entering the column. The length of the plateau and the concentration at which it occurs are functions of the amount of gypsum present in the system. When the gypsum was leached from the system, the Mg 2+ concentration increased to a value approaching the concentration of the solution entering the soil. A general method for calculating the ionic composition of the effluent from initial conditions was developed. It was found that theoretical values calculated by this computer method approximated those found experimentally.