Registration Dossier
Registration Dossier
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EC number: 208-655-6 | CAS number: 537-01-9
Endpoint summary
Administrative data
Description of key information
Additional information
The adsorption/desorption behaviour of the test item, dicerium tricarbonate, on soil was determined using three soils and the batch equilibrium method according to OECD Guideline N°106.
Initially, a preliminary test was performed in order to investigate the adsorption behaviour of dicerium tricarbonate. For this purpose, three soils, a test concentration of 0.89 mg/L and three soil (dry weight) to aqueous phase ratios: 1/50 (1 g/50 mL), 1/25 (1 g/25 mL) and 1/5 (5 g/25 mL) were used. Very high adsorption was observed for all three ratios. After 48 hours of agitation, virtually all of the initial amount of test item was adsorbed (>99%).
Therefore, for the subsequent screening test, the maximum soil-to-solution ratio of 1/50 was selected together with a test item concentration of 1.23 mg/L and the same three soils. The adsorption/desorption kinetics of dicerium tricarbonate were determined after 2, 4 or 5, 24 and 48 hours of agitation. After 2 hours of agitation, adsorption represented 95%, 100% and 100% for soils I to III, respectively. Only low desorption was observed during the 48-hour desorption period (maximum of 2% of test item desorbed for all three soils).
The mass balance was performed during the screening test at the soil to solution ratio of 1/50. The amount of applied test item recovered from the samples represented 83.6%, 100.9% and 87.4% for soils I to III, respectively. Most of the applied amount was extracted from the soils, with only <0.4% of applied detected in the supernatants. The mass balance results confirmed the strong adsorption of dicerium tricarbonate to soil.
The following adsorption/desorption distribution coefficients were obtained for the soils at the selected ratio of 1/50:
- Mean Koc value: 3940404
- Mean Koc, des value: 7556699
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