Priority organic pollutant assessment of sludges for agricultural purposes

In contrast, the vast majority of samples contained NPE concentrations much higher than 50 mg/kg dm limit. The values ranged from 14.3 to 3150 mg/kg dm (median value = 286.6 mg/kg) being composted sludge samples the less contaminated ones (17.9-363.4 mg/kg dm; median value = 89.3 mg/kg). Special attention should be paid to the Catalan sludge NPE contamination owing to the high levels detected.