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EC number: 242-745-6
CAS number: 19009-56-4
Table 1. Dead Time of the HPLC System
Table 2. Capacity Factors (k’) of the Reference Items for Soil
and Sewage Sludge
Log Koc (soil)
Log Koc (sewage sludge)
Table 3. Calibration Data of the Reference Items for Soil and Sewage
Retention Times, Capacity Factors (k’) and Adsorption Coefficient (log
KOC) of 2-Methyldecan-1-al for Soil and Sewage Sludge
Log Koc (soil) ± SD
(95 % CI)
Log Koc (sewage sludge) ± SD
3.9 ± 0.1
(3.5 to 4.2)
3.9 ± 0.1
4.0 ± 0.2
(3.4 to 4.6)
The adsorption coefficient (Koc) for the test item 2-Methyldecan-1-al
(batch number: 461/16) on soil and on sewage sludge using high
performance liquid chromatography (HPLC) was estimated according to OECD
121 (2001) and Council Regulation (EC) No. 440/2008, Method C.19 on
2018-04-04 at Noack Laboratorien GmbH, 31157 Sarstedt, Germany.
The test was performed at one pH value since the test item is not
ionisable in the relevant pH range 5.5 to 7.5 and temperature controlled
(22.9°C, mean value). Acetonitrile : ultrapure water (50 : 50 v/v) was
used as mobile phase. A 500 mg/L sample of the test item
2-Methyldecan-1-al was analyzed threefold via HPLC on a cyanopropyl
(CN-) column with DAD detection.
Calibrations were performed using eight reference items for soil and
seven for sewage sludge with known log KOC values (given by the
guidelines). The reference items were measured twice, once before and
once after the measurement (double injection of one replicate) of the
test item and were detected by DAD. Sodium nitrate was used for
determination of dead time of the test system. One log KOC value for
soil and one log KOC value for sewage sludge was derived under
consideration of the first and second calibration.
Based on the results of the study, the following adsorption coefficients
Log Koc (soil) = 3.9
Log Koc (sewage sludge) = 4.0
Adsorption Coefficient: Koc (soil) = 7943 L/kg, Koc (sewage sludge) =
10000 L/kg; OECD 121 (HPLC); Goller, 2018
In a single key study, the adsorption coefficient (Koc) of the test item
on soil and on sewage sludge using high performance liquid
chromatography (HPLC) was estimated according to OECD 121 (2001) and
Council Regulation (EC) No. 440/2008, Method C.19 on 2018-04-04 at Noack
Laboratorien GmbH, 31157 Sarstedt, Germany.
Log Koc (soil) = 3.9 (key value for chemical safety assessment)
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