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In this study, we created and optimised a two-step food digestion procedure to extract MPs and proposed a recommended dosage of food digestion reagents on the basis of the combined fluid volatile suspended solids (MLVSS) level of the test. Consecutive addition of 30% H2O2 + 1 M HNO3 (vv = 11, T = 60 °C, t = 5 h + 5 h) could efficiently extract MPs from sludge examples (over 90%), additionally the advised dosage of digestion reagent was 100 ml 30% H2O2+100 ml 1 M HNO3 because of