Sulfonic acids, C14-17-sec-alkane, sodium salts

Endpoint summary

Additional information

Monitoring data from various sewage treatment plants (STPs)

In the SAS HERA Report (AISE, 2005) monitoring data for SAS in municipal STPs were given which are listed in Table 4.zzz below.

Table 4.zzz Influent & effluent concentrations of STP and associated removal rates

Country	Location	Influent conc.	Effluent conc.	Reliability	Calc. Removal	Ref.
Germany	Lüdinghausen	1.2 mg/L	2 µg/L	2	99.8 %	Klotz, 1994b
Germany	Marl-Ost	0.5 mg/L	4 µg/L	2	99.2 %	Klotz, 1994b
Germany	München II (Autumn 1993)	0.3 mg/L	< 1 µg/L	2	> 99.7 %	Klotz, 1994b
Germany	München II (Winter1993)	0.5 mg/L	2 µg/L	2	99.6 %	Klotz, 1994b
Switzerland	Zürich-Glatt	0.54–0.89 mg/L	< 1–17 µg/L	1	96.9 to > 99.9 %	Field et al., 1994
Switzerland	Bülach	0.85 mg/L	< 1 µg/L	1	> 99.9 %	Field et al., 1994
Switzerland	Niederglatt	0.67 mg/L	< 1 µg/L	1	> 99.9 %	Field et al., 1994
Switzerland	Opfikon	0.61 mg/L	< 1 µg/L	1	> 99.8 %	Field et al., 1994

Reliability criteria of IUCLID are used

Based on the removal rates given in Table 4.zzz an average removal of 99.4 % can be calculated.

Monitorign data of SAS in sewage sludge

In the SAS HERA Report (AISE, 2005) monitoring data for SAS sewage sludge were given which are listed in Table 4.aaa below.

Table 4.aaa Monitoring data on SAS in sewage sludge

Country	Location	Primary sludge	Secondary sludge	Digested sludge	Reliability	Reference
Germany	Kriftel (1991)	-	0.05 g/kg dw	3 g/kg dw	2	Klotz, 1994b
Germany	Lorsbach (1991)	-	< 0.1 g/kg dw	0.4 g/kg dw	2	Klotz, 1994b
Germany	Lüdinghausen (1986)	1.8 g/kg dw.	0.6 g/kg dw	2.4 g/kg dw	2	Klotz, 1994b
Germany	Lüdinghausen (1987)	1.2 g/kg dw.	1.7 g/kg dw	2.9 g/kg dw	2	Klotz, 1994b
Germany	Essen (1987)	-	-	3.3 g/kg dw	2	Klotz, 1994b
Germany	München (1987)	-	< 0.1 g/kg dw	-	2	Klotz, 1994b
Germany	München (1993)	-	< 0.1 g/kg dw	-	2	Klotz, 1994b
Switzerland	Zürich (1992)	-	-	0.8 g/kg dw	2	Field, 1992
Switzerland	Opfikon (1992)	-	-	0.8 g/kg dw	2	Field, 1992
Switzerland	Niederglatt (1992)	-	-	0.3 g/kg dw	2	Field, 1992
Switzerland	Seegräben (1992)	-	0.4 g/kg dw	-	2	Field, 1992
Switzerland	Stäfa (1992)	-	0.5 g/kg dw	-	2	Field, 1992
Switzerland	Zürich (1995)	-	0.5 g/kg dw	0.7 g/kg dw	1	Field, 1995

Reliability criteria of IUCLID are used

Fate of SAS in sewage treatment plants

Field et al. (1995) have carried out a detailed mass balance investigation on the fate of SAS in the municipal sewage treatment plant of Zürich-Glatt (Figure see AISE HERA SAS, 2005). 15.6 % of SAS entering the STP is transferred via primary sludge to the anaerobic digester, and 84.4 % of SAS enters the activated sludge plant. In the activated sludge, 84.1 % is of SAS is biodegraded and 0.3 % of SAS is in the effluent of the STP. This mass balance is used for the environmental exposure assessment of SAS.

Monitoring data of SAS in German rivers

SAS monitoring data from six German rivers measured at 13 different locations are available (AISE HERA SAS, 2005). At 11 locations the measured SAS concentration was ≤ 1 µg/L which was the limit of detection. At two locations higher SAS concentrations were found but the reliability of these measurements cannot be assigned from the available data (see Table 4.bbb).

Table 4.bbb Monitoring data of SAS in 6 German rivers

River name	No. of Locations	Conc. in river	Reliability	Reference
Isar, near STP Munich II (winter 1993)	1	above STP: < 1 µg/L below STP: 1 µg/L	2	Klotz, 1994b
Main, near Frankfurt (summer 1993)	1	< 1 µg/L	2	Klotz, 1994b
Leine, near STP Herrenhausen	1	< 1 µg/L	2	Klotz, 1994b
Rur, Wurm, Inde	8	< 1 µg/L	4	Schulze, 2001
Rur	6	1 µg/L (median)	4	Schroeder, 1995

Reliability criteria of IUCLID are used