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Table 2 Analytical methods for wet chemical analyses of the digestate

From: Process upsets in a full-scale anaerobic digestion bioreactor: over-acidification and foam formation during biogas production

Parameter Sample pre-treatment Analytical methods and instruments
TS No DIN 12880
VS No DIN 12879
pH value Sieved Microprocessor pH meter pH 95 (WTW, Germany)
VFA/TIC Sieved Titration method according to [18]
TOC, TN Sieved TOC-VCSH/CSN with a TN unit (Shimadzu, Japan)
NH4–N Filtered DIN 38406 E5. Spektroquant® test kit (measuring range 0.01-3 mg L−1 NH4-N, Merck. Germany). photometric measurement with MultiLab P5 (WTW, Weilheim, Germany)
Acetate, propionate, butyrate, lactate Filtered High-performance liquid chromatography (Shimadzu, Japan); detector: RID-10A; column: VA 300/7.8 Nucleogel Ion 300 OA; eluent: 0.01 N H2SO4
Water-soluble elements (Ca, Mg, P, S, K, Na) Filtered Inductively coupled plasma atomic emission spectrometry ICP-AES (Spectroflame, Spectro Int., Kleve, Germany)