Semnan University Press Applied Chemistry Today 2981-2437 12 43 2017 06 22 Preconcentration and Determination of Paranitroaniline Using Dispersive Liquid-Liquid Microextraction in the textile waste samples Preconcentration and Determination of Paranitroaniline Using Dispersive Liquid-Liquid Microextraction in the textile waste samples 171 184 2369 10.22075/chem.2017.2369 FA Mohammad Alimoradi 1دانشگاه آزاداسلامی، واحد اراک، دانشکده علوم پایه، اراک، ایران Marziyeh Gharib 1دانشگاه آزاداسلامی، واحد اراک، دانشکده علوم پایه، اراک، ایران Seyed Mohammad Hosseini Roholah Heydari 3 دانشگاه علوم پزشکی لرستان، خرم آباد، مرکز تحقیقات گیاهان دارویی رازی، خرم آباد، ایران Journal Article 2015 07 11 In this study, dispersive Liquid- Liquid microextraction (DLLME) as highly sensitive procedure was developed for preconcentration and determination of paranitroaniline in  textile industrial wastewater samples. Initially, a mixture of 200 &muL of dicloromethan (Extracting solvent) and 800 &muL of acetone (disperser solvent) was rapidly injected by a syringe into 9 mL aqueous sample containing 0.02 mg L-1  paranitroaniline (analyte). Thereby, a cloudy solution formed. After centrifugation, the fine droplets containing the extracted analyte were sedimented at the bottom of the conical test tube. This phase was collected by a microsyring and after dilution by acetone, 100 µL of it was transferred into the spectrophotometer for analysis. The Samples of analysis at wavelength of 375 nm was done. The calibration curve of method was linear in the rage of 0.025- 0.35 mg L-1 paranitroaniline with a detection limit of 0.01 mg L-1 and a relative standard deviation (RSD) for five replicate measurements of 4.97% at 0.025 mg L-1 paranitroaniline. Recovery values in different concentration levels in the range of 96.2-98% and the enrichment factor of 23.2 was obtained. In this study, dispersive Liquid- Liquid microextraction (DLLME) as highly sensitive procedure was developed for preconcentration and determination of paranitroaniline in  textile industrial wastewater samples. Initially, a mixture of 200 &muL of dicloromethan (Extracting solvent) and 800 &muL of acetone (disperser solvent) was rapidly injected by a syringe into 9 mL aqueous sample containing 0.02 mg L-1  paranitroaniline (analyte). Thereby, a cloudy solution formed. After centrifugation, the fine droplets containing the extracted analyte were sedimented at the bottom of the conical test tube. This phase was collected by a microsyring and after dilution by acetone, 100 µL of it was transferred into the spectrophotometer for analysis. The Samples of analysis at wavelength of 375 nm was done. The calibration curve of method was linear in the rage of 0.025- 0.35 mg L-1 paranitroaniline with a detection limit of 0.01 mg L-1 and a relative standard deviation (RSD) for five replicate measurements of 4.97% at 0.025 mg L-1 paranitroaniline. Recovery values in different concentration levels in the range of 96.2-98% and the enrichment factor of 23.2 was obtained. https://chemistry.semnan.ac.ir/article_2369_3ef8a04c055845e5599e42839fea44a7.pdf