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EC number: 200-543-5
CAS number: 62-56-6
The adsorption/desorption of thiourea was determined in a test that was conducted according to OECD Guideline 106 (May 12, 1981). In this test three different kind of soil were used having the following characteristics:
Thiourea was added to the soils in 0.01 M CaCl2. Soil and test substance were equilibrated for 16 h. Afterwards thiourea was extracted and analytically determined (GC, UV). (No further details on test substance concentration, and analytical methods were reported.) The results for thiourea adsorption to soil are as follows:
The authors report difficulties regarding the determination of thiourea desorption from the soils as the substance was reported to biodegrade in the test (extent of biodegradation was not reported).
Because of the observed biodegradation of the substance in soil, the "advanced test" proposed by the guideline was not conducted as the authors did not expect to obtain valid test results on adsorption.
Experimental Koc values for thiourea in three soils were determined to be 28.95, 26.13. and 36.49.
The mean value (Koc = 30.5) is carried forward to the risk assessment.
The adsorption and desorption of thiourea was determined in a test according to OECD guideline 106 (May 12, 1981). In this test three different soil types with the following characteristics were used:
The results for thiourea adsorption to soil are as follows:
The determined K values for thiourea are dependent on soil texture characteristics, pH and content of organic carbon. The mean Koc from the three soil types is carried forward to the risk assessment of thiourea.
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