en عمومى General مقاله اصیل Original Article <div style="text-align: justify;"><span class="fontstyle0">Background: </span><span class="fontstyle2">Due to the complexities involved in the extraction of micropollutants, the information regarding micropollutants like paraben in wastewater and sludge is scarce. The aim of this study was to adopt a microwave-assisted dispersive liquid-liquid micro-extraction (MADLLME) method for the<br> extraction of parabens in municipal wastewater treatment plant (WWTP).</span><br> <span class="fontstyle0">Methods: </span><span class="fontstyle2">A mixed stock solution of methyl-, ethyl-, propyl-, and butyl-parabens with concentration of 10 mg/mL were prepared in methanol. To validate this method, the limit of detection (LOD), limit of quantification (LOQ), linearity, and m/z were measured. To adopt this method in different condition, the effect of pH (3, 7, 9, and 12), microwave power (180, 300, 450, and 600 W), solvent type (methanol, acetone, methanol/water, acetone/water), and 1 g folorisil were assessed. After adopting MADLLME method, the paraben fate of this WWTP was evaluated through mass loading and emission.</span><br> <span class="fontstyle0">Results: </span><span class="fontstyle2">The optimum performance of MADLLME method was observed at pH = 7, microwave power= 450 W, reaction time = 30 s, and methanol as the solvent. The total concentrations of four paraben metabolites in the WWTP ranged between 2505 ng/L in influent, 1953 ng/L in effluent, and 8.03 ng/g at wet weight sludge samples. The total mass loading and emission of four parabens in this WWTP was 0.672 mg/d/1000 people and 0.186 mg/d/1000 people, respectively.</span><br> <span class="fontstyle0">Conclusion: </span><span class="fontstyle2">MADLLME method seems to be an excellent alternative, as a green extraction technique, for determining various groups of emerging micropollutants in different matrices.</span></div> Paraben, Environment, Municipal sludge, Dispersive liquid-liquid micro-extraction, Microwave-assisted extraction 215 224 http://ehemj.com/browse.php?a_code=A-10-1-147&slc_lang=en&sid=1 Mohammad Mehdi Amin amin@hlth.mui.ac.ir 10031947532846005881 10031947532846005881 No Environment Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Irann Majid Hashemi mhashemi120@gmail.com 10031947532846005882 10031947532846005882 No Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran Karim Ebrahimpour k.ebrahiim@gmail.com 10031947532846005883 10031947532846005883 No Environment Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran Afsane Chavoshani Chavoshani.afsane@yahoo.com 10031947532846005884 10031947532846005884 Yes Corresponding author: Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran