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EC number: 212-161-6
CAS number: 766-09-6
Adsorption to solid soil phase is not expected.
The adsorption potential was estimated
for 1 -Ethylpiperidine (CAS 766 -09 -6) by determination of the
Adsorption Coefficient (Koc) by High Performance Liquid Chromatography
(HPLC) Method (BAYER MaterialScience AG 2006/006/06). The substance
ionises in aqueous solutions, therefore the adsorption coefficient was
calculated according to Franco & Trapp (2008, 2009, 2010) to correct for
the charged molecule at pH 5, 7 and 8. The estimation for the uncharged
- HPLC Method: Koc = 251; log Koc = 2.4
- Franco & Trapp, 2008, 2009 and 2010:
pH 5 to 7: Koc = 1041; log Koc = 3.02
pH 8: Koc = 1039; log Koc = 3.02
- MCI method: Koc = 102.6; log Koc = 2.01
- Kow method: Koc = 80.4; log Koc = 1.91
However, the measured pKa of 10.45 (REAXYS,
2011) indicates that the 1 -ethylpiperidine will primarily exist as a
cation in the environment. Cations generally adsorb stronger to soils
containing organic carbon and clay than their neutral counterparts.Regarding
the charged molecule, at pH 7 the log Koc was estimated to be 3.02 (Koc
= 1041 L/kg) following the method of Franco & Trapp (2008, 2009, 2010)
and using the pKa of 10.45 and the calculated log Kow for the uncharged
molecule of 1.89. The correction was performed for pH 5, 7, and 8, which
represents 98% of the European soils.
Based on the determination of the adsorption
coefficient by HPLC method (log Koc = 2.4), an adsorption to the solid
soil phase is not expected.
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