TY - JOUR ID - 4144 TI - Determination of Diazinon in Environmental Samples Using Modified Multi-Walled Carbon Nanotubes as Pipette-Tip Solid Phase Extraction Sorbent JO - Iranian Journal of Analytical Chemistry JA - IJAC LA - en SN - 2383-2207 AU - Rezaei Kahkha, Mohammad Reza AU - Kaykhaii, Massoud AU - Shafee-Afarani, Mahdi AU - Rezaei Kahkha, Batool AD - Department of Environmental Health Engineering, Faculty of Health, Zabol University of Medical Sciences, Zabol, Iran AD - Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran AD - Department of Material Engineering, University of Sistan and Baluchestan, Zahedan, Iran AD - Department of Occupational Health Engineering, Kerman University of Medical Sciences, Kerman, Iran Y1 - 2017 PY - 2017 VL - 4 IS - 2 SP - 10 EP - 16 KW - Carbon Nanotubes KW - Diazinon KW - Pipette Tip KW - Preconcentration KW - solid phase extraction DO - N2 - In this work, a microextraction technique based on pipette tip solid-phase extraction was used for preconcentration and determination of diazinon. Carbon nanotube functionalized by zinc sulfide and ethylene glycol was used as sorbent. Determination of diazinon was performed using high performance liquid chromatography and UV detection. Important parameters that influence the extraction efficiency (i.e. pH, amount of adsorbent, extraction time, salt addition, volumes of sample and eluting solvent and number of aspirating/dispensing cycles for both solvent and sample) were investigated and optimized. Results were showed that method was validated over the range of 0.50 - 100.0 µg L-1. Repeatability was satisfactory, bellow 3.78% for 5 replicate measurements of 20 µg L-1 of diazinon. The limit of detection of this method is 0.03 µg L-1 with an enrichment factor of 100 and short extraction time of 8.5 min, which confirmed suggested method is a reliable and accurate for extraction and preconcentration of diazinon. UR - https://ijac.journals.pnu.ac.ir/article_4144.html L1 - https://ijac.journals.pnu.ac.ir/article_4144_91eed8f676d8ac97d7ea3e97f2ddc7ce.pdf ER -