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EC number: 411-150-5 | CAS number: 29617-66-1
Summary of Results
pH 5.7 Sand
pH 6.2 Loamy Sand
pH 8.2 Loam
A GLP study was performed in accordance with OECD 106 to determine the soil sorption and desorption of radio labelled L-2-chlorpropionic acid.
The test was performed in triplicate in three different soil types, sand (pH 5.7), sandy loam (pH 6.2) and loam (pH 8.2) with an initial nominal concentration of 25 mg/L of the test substance.
Liquid scintillation counting (LSC) was used to determine the concentration of the test substance in the aqueous medium.
A preliminary test was performed to validate the analytical method and assess the adsorption characteristics of the test substance with respect to PTFE and glass.
The soil kinetic test was performed in triplicate for each test system. For each soil type, a test substance blank, a soil-less control and a full test system were performed. After 2, 4, 8 and 24 hours, tubes were removed, centrifuged for 10 minutes at 10000rpm and triplicate 4ml aliquots of the supernatant removed for analysis.
No tubes were returned to the test system after sampling; sufficient tubes were set up for each sampling period.
After the 24 hour sample had been completed the remaining supernatant volume was measured. This volume, in addition to the 12mls removed for the analysis, formed the initial volume for the calcium chloride solution in the subsequent desorption test.
For the desorption test the appropriate volume of 0.01M Calcium chloride solution was added to the respective centrifuge tubes containing the soil subjected to the adsorption process. These tubes were ‘rolled’ for 24 hours. After centrifugation and removal of triplicate 4ml aliquots for analysis, the remaining supernatant was removed and the original volume of fresh calcium chloride solution added. After a further 24 hours the centrifugation and sampling process was repeated.
The preliminary test showed no appreciable adsorption of the test substance to PTFE or glass and that the analytical method was reproducible and sufficiently sensitive for the study.
The soil kinetics test results showed <1% adsorption of the test substance on the sand and sandy loam soils with an average of 5% being adsorbed onto the loam soil. Equilibrium was attained after 2 hours. The soil adsorption data was ultimately used to determine the mean adsorption distribution coefficient (Koc) of the test substance. In pH 5.7 sand the Koc was <9.1, in pH 6.2 sandy loam, 2.1 and in pH 8.2 loam, 2.0.
The results from the soil desorption test showed, 1% desorption for all three soil types.
The overall recoveries for the soil sorption and desorption gave a recovery of 95 – 100% of the applied radioactivity, indicating that the data are quantitative.
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