Micelle Mediated Preconcentration of Mercury in pH Controlled Mode for Trace Analysis
نویسندگان
چکیده مقاله:
A micell-mediated phase separation method for preconcentration of ultra-trace quantities of mercury as a prior step to its determination by UV-Vis spectrophotometry has been developed. The method is based on Hg(II)-dithizone complex formation in alkaline aqueous solution, and extraction of this Hg(II)-dithizone secondary complex into the surfactant-rich phase of the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114). This cloud point method of extraction was carried out at 54 ◦C and the surfactant- rich phase containing analyte was dissolved in 250 µL of ethanol with pH 8. The obtained solution was introduced into a micro quartz cell and the analyte was determined by UV-Vis spectrophotometry. Complexation and cloud point extraction of the mercury in alkaline solution markedly facilitate the phase-separation process, lower the temperature of the cloud point, enhances the complex to background absorption ratio and eliminates the interference of Cu2+, Al3+ and Fe3+. Under the optimal extraction and reaction conditions, detection limits, relative standard deviations and linear calibration graphs were, 0.9 ng/mL, lower than 2% and 3.0–250.0 ng/mL respectively. This detection limit is 15 times lower than one obtained by using the same method but at acidic media. The method was applied to the determination of Mercury in soft water and physiology serum samples.
منابع مشابه
Preconcentration in Inorganic Trace Analysis
Preconcentration in trace analysis lowers the detection limit, simplifies the treatment of a representatIve sample, facilitates calibration, reduces the need for various standard reference samples and frequently involves separation of the matrix in analysis of toxic, radioactive and expensive materials. In this paper, the types of preconcentration are considered and quantitative characteristics...
متن کاملCommission on Microchemical Techniques and Trace Analysis Separation and Preconcentration of Trace Substances . I — Preconcentration for Inorganic Trace Analysis
متن کامل
Role of Sample Decomposition and Preconcentration in Elemental Trace Analysis
Progress in elemental trace analysis means that lower con— centrations can be determined in a more reliable and efficient way. The demands posed to trace element analysis follow generally the tendency that lower and lower concentrations should be determined in matrices which become more and more complex. The most economical scientific strategy depends strongly on the element to be determined, o...
متن کاملPreconcentration techniques for trace analysis via neutron activation.
A review is given of the methods that have been proposed for enrichment of trace elements in samples that are to be analysed by neutron-activation methods. The emphasis is on classification of methods, with full illustrations by means of practical examples.
متن کاملa time-series analysis of the demand for life insurance in iran
با توجه به تجزیه و تحلیل داده ها ما دریافتیم که سطح درامد و تعداد نمایندگیها باتقاضای بیمه عمر رابطه مستقیم دارند و نرخ بهره و بار تکفل با تقاضای بیمه عمر رابطه عکس دارند
Micelle Mediated Trace Level Sulfide Quantification through Cloud Point Extraction
A simple cloud point extraction protocol has been proposed for the quantification of sulfide at trace level. The method is based on the reduction of iron (III) to iron (II) by the sulfide and the subsequent complexation of metal ion with nitroso-R salt in alkaline medium. The resulting green-colored complex was extracted through cloud point formation using cationic surfactant, that is, cetylpyr...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ذخیره در منابع من قبلا به منابع من ذحیره شده{@ msg_add @}
عنوان ژورنال
دوره 35 شماره 2
صفحات 79- 87
تاریخ انتشار 2016-04-01
با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023