Interstitial water constitutents were measured by UV-VIS spectrometry using colorimetric methods (e.g., ammonium, nitrate, nitrite, phosphate, silica, and sulfide) by an Agilent CARY 100 UV-VIS spectr
Methods:Sampling:• Rhizon technique (Seeberg-Elverfeldt et al. 2005)SO42-:• Ion chromatography (Metrohm IC Net 2.3)Fe2+:• Ferrozine method (Stookey 1970)NH4+:• spectrophotometrically using a Multiskan
