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The major share of phosphate in biogas digestate is inorganic. For optimized nutrient recovery, inorganic phosphate must be analyzed adequately. Therefore, the photometric spectra of extracts from Hedley fractionation were measured and analyzed for their peaks using the molybdenum blue method. The ideal wavelength was 709 nm. The lower calibration limit needed to be raised from 15 µg L-1 to 50 µg L-1 to avoid underestimation of phosphate concentration. Drying digestate before extraction increased H2O-P by 78.4% and NaHCO3-P by 44.9% co
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