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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Biquarterly Iranian Journal of Analytical Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Carbon nanotubes,Diazinon,Preconcentration,Solid phase extraction,Pipette Tip
- چکیده: در این تحقیق یک تکنیک میکرواستخراج بر پایه استخراج فاز جامد بوسیله سرسمپلر برای پیشتغلیظ و تعیین مقدار دیازینون استفاده شد. نانولولههای کربنی توسط سولفید روی و اتیلن گلیکول عاملدار شد. دیازینون توسط دستگاه کروماتوگرافی مایع با عملکرد بالا تعیین مقدار شد. پارامترهای مهم مانند pH، مقدار جاذب، زمان استخراج و اثر نمک، حجم حلال و حجم محلول و تعداد دفعات پر و خالی کردن سمپلر که بر بازده استخراج مؤثر بودند، بهینه شد. نتیجه نشان داد که این روش برای گستره 0.5 تا 100 میکروگرم بر لیتر خطی است. تکرارپذیری روش رضایتبخش است و زیر 3.78% میباشد و حد تشخیص و فاکتور تغلیظ روش 0.03 میکروگرم بر لیتر و 100 بدست آمد که درستی روش را در تعیین دیازینون تأیید میکند.
- چکیده انگلیسی: 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.
- انتشار مقاله: 15-01-1396
- نویسندگان: Mohammad Reza Rezaei Kahkha,Massoud Kaykhaii,Mahdi Shafee-Afarani,Batool Rezaei Kahkha
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Carbon nanotubes,Methyl orange,nanocatalyst,sonocatalysis,Degradation efficiency,Zinc sulfide
- چکیده:
- چکیده انگلیسی: Dye sewage is dangerous problem in our environmental aquatics that cause generation of harmful effects for living organism. In this work, because of simplicity, easy operation, high efficiency and no creating secondary pollutants, ultra sound radiation applied for degradation of a synthetic dye, methyl orange using zinc sulfide nano particles decorated on carbon nanotubes as nanocatalyst. ZnS/CNTs prepared by co-precipitation of carbon nanotubes and zinc aceate. Methyl orange (MO) is a cationic dye that used widely in some medical uses, coloring paper, dyeing cottons, wools, coating for paper stocks and etc. For achieving highest degradation efficiency several parameters such as pH, amount of nanocatalyst, initial dye concentration and time were evaluated and optimized. Results showed that highest degradation efficiency (100%) obtained at 0.3 gr of nanocatalyst while initial dye concentration is 30 mg/L at pH, 2. Comparison of several methods for degradation of methyl orange showed feasibility of applied method. In addition, reusability of nanocatalyst was suitable for degradation of MO in real wastewater samples.
- انتشار مقاله: 18-11-1396
- نویسندگان: Mohammad Reza Rezaei Kahkha,Batool Rezaei Kahkha,Ali Faghihi Zarandi
- مشاهده