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한국토양비료학회 한국토양비료학회지 한국토양비료학회지 제24권 제2호
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    초록·키워드

    Two solution to soil ratios, 2 : 1 and 5 : 1 were tested to determine the appropriate ratio in the sorption measurement of f. sulfoxide for Wahiawa soil samples, 0-20 cm, 40-60 cm and 100-120 cm, and Salinas soil samples, 0-15 cm and 115-130 cm. One μ mol/L f.sulfoxide was used as an initial equilibration concentration. Sorption of f.sulfoxide at 5 : 1 ratio showed appropriate mixing, while sorption at 2 : 1 ratio indicated insufficient mixing during the various batch equilibration times (4, 12, 24 and 48 hours). For most samples the degree of sorption was about 20-50%, which falls in the desired range (20-80%) at the 5 : 1 ratio. An exception was with the low-sorptive Wahiawa subsoil in which the ranges were below 20%. Thus the 5 : 1 ratio can be used for f.sulfoxide sorption measurement.Four equilibration times (4, 12, 24 and 48 hours) and four concentrations(0.1, 1.0, 5.0 and 10μmol/L) were used to determine the appropriate equilibration time for Wahiawa and Salinas soils. Sorption increased over all equilibration times, indicating no complete equilibrium within 48 hours. Apparent equilibrium was reached in 4 hours, and sorption increased slowly until 24 hours and faster thereafter, except for the Wahiawa soil, 100-120 cm. The recommended equilibration time is 24 hours, since it may eliminate the insufficient sorption and yet avoid undesirable transformation.

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      UCI(KEPA) : I410-ECN-0101-2014-521-000692538