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Table 1

Overview of the methods of analysis

SampleParameterAnalysis
Water P, Ca, Mg, K, S, Fe, Mn, Pb, Cd, Cr, Cu, Ni, Zn, Hg ICP-OES (DIN EN ISO 11885 E22:2009-09) 
Water COD, Ntot, NO3-N, NO2-N Cuvette test (Hach-Lange, Düsseldorf, Germany) 
Water NH4-N ISE-Sensor NH 500/2; pH/Ion 7310 (Xylem Analytics Germany Sales GmbH & Co. KG., Weilheim, Germany) 
Lettuce (shoot) As, Cd, Co, Cr, Cu, Ni, Pb ICP-MS (VDLUFA 2011 (vol. VII, cap. 2.2.3.1 (2014))) 
Lettuce (shoot) K, P ICP-OES (VDLUFA 1995 (vol. II.1, cap. 8.10 (2007))) 
Lettuce (shoot) EA (VDLUFA 1995 (vol. II.1, cap. 3.5.2.7 (2000))) 
Lettuce (shoot) Hg KD-AAS (VDLUFA 2011(vol. VII, cap. 2.2.2.9)) 
SampleParameterAnalysis
Water P, Ca, Mg, K, S, Fe, Mn, Pb, Cd, Cr, Cu, Ni, Zn, Hg ICP-OES (DIN EN ISO 11885 E22:2009-09) 
Water COD, Ntot, NO3-N, NO2-N Cuvette test (Hach-Lange, Düsseldorf, Germany) 
Water NH4-N ISE-Sensor NH 500/2; pH/Ion 7310 (Xylem Analytics Germany Sales GmbH & Co. KG., Weilheim, Germany) 
Lettuce (shoot) As, Cd, Co, Cr, Cu, Ni, Pb ICP-MS (VDLUFA 2011 (vol. VII, cap. 2.2.3.1 (2014))) 
Lettuce (shoot) K, P ICP-OES (VDLUFA 1995 (vol. II.1, cap. 8.10 (2007))) 
Lettuce (shoot) EA (VDLUFA 1995 (vol. II.1, cap. 3.5.2.7 (2000))) 
Lettuce (shoot) Hg KD-AAS (VDLUFA 2011(vol. VII, cap. 2.2.2.9)) 

Notation: Ntot was analysed in the influent of the aeration tank. For the determination in the irrigation water, the sum of NO3-N, NO2-N und NH4-N was calculated as Ntot at the other sampling points.

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