پیش‌تغلیظ و اندازه‌گیری اورانیم در نمونه‌های آبی با استفاده از استخراج نقطه‌ی ابری جفت شده با طیف‌سنجی آلفا بر پایه‌ی سوسوزنی مایع

نوع مقاله: مقاله پژوهشی

نویسندگان

1 پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 836-14893، تهران ـ ایران

2 دانشکده فنی مهندسی شیمی، دانشگاه گیلان، صندوق پستی: 3756، رشت ـ ایران

چکیده

پیش­تغلیط و اندازه­گیری اورانیم در نمونه­های آبی با استفاده از استخراج نقطه­ی ابری جفت شده با طیف­سنجی آلفا بر پایه­ی سوسوزنی مایع مورد بررسی قرار گرفته ­است. یون­های فلزی با معرف کی­لیت­ساز چربی دوست 8- هیدروکسی کینولین (HQ-8) کمپلکس تشکیل داده و در دمای بالای دمای نقطه­ی ابری سورفکتانت تریتون 114-X به درون فاز غنی از آن استخراج گردید. تفکیک کامل فازها با استفاده از سانتریفوژ به انجام رسید. هم­چنین عوامل مؤثر بر فرایند استخراج نقطه­ی ابری اورانیم شناسایی و سپس میزان تأثیر این عوامل (pH محیط، غلظت لیگاند، غلظت سورفکتانت، دما و زمان تعادل، زمان ماند در سانتریفیوژ، یون­های مزاحم موجود در محیط) مورد ارزیابی قرار گرفته، شرایط بهینه برای پیش­تغلیظ و اندازه­گیری اورانیم در محلول­های آبی با استفاده از استخراج نقطه­ی ابری تعیین گردید. در شرایط بررسی شده، بازده استخراج بالا (99%) و منحنی کالیبراسیون در گستره­ی 6.25×10-4 تا  0.1 μg L-1 خطی بود. ضریب پیش­تغلیظ، 48.5 به دست آمد. این روش، تعیین مقدار اورانیم در نمونه­های آبی را با حد تشخیص 0.015μg L-1 امکان­پذیر ساخت.

کلیدواژه‌ها


عنوان مقاله [English]

Preconcentration and Determination of Uranium in Water Samples by Cloud Point Extraction Coupled with Alpha Liquid Scintillation Spectrometry

نویسندگان [English]

  • S.A Milani 1
  • M.A Salehi 2
  • N Rahgozar 2
چکیده [English]

Cloud-point extraction (CPE) was used with lipophilic chelating agent to extract uranium(VI) from aqueous solutions. The applied methodology was based on formation of metal complexes soluble in a micellar phase of a non-ionic surfactant, Triton X-114. The metal ions complexes, then, were extracted into a surfactant-rich phase at a temperature above the cloud-point temperature. The influence of different parameters including the pH of the solution, surfactant concentration, concentration of the chelating agent, incubation time, equilibrium temperature, centrifugation time, initial concentration of U(VI) and interfering ions on the extraction efficiency was studied. A high extraction efficiency was observedand the calibration graphs were found to be linear in the range of 6.25×10-4 to 0.1 μg L-1 of uranium(VI) ion. The detection limit (DL) of the applied method was 0.015μg L-1. The pre-concentration factor was obtained to be 48.5. The interference of the some cations was also tested and in this respect no significant influence was obtained.

کلیدواژه‌ها [English]

  • Uranium Preconcentration
  • Cloud-Point Extraction
  • Uranium Determination
  • 8-Hydroxyquinoline
  • Triton X-114
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