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Scintillating polymer inclusion membrane for preconcentration and determination of @a-emitting actinides [An article from: Analytica Chimica Acta]
Book Details
PublisherElsevier
ISBN / ASINB000RR004M
ISBN-13978B000RR0040
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The scintillating polymer inclusion membrane (S-PIM) was developed for preconcentration and determination of @a-emitting actinides from aqueous solution. The preparation of S-PIM involved physical immobilization of an extractant bis(2-ethylhexyl)phosphoric acid, primary scintillator 2,5-diphenyloxazole, and secondary scintillator 1,4-bis(2-methylstyryl)benzene in the plasticized cellulose triacetate matrix. The S-PIM was found to be effective for the quantitative sorption (94-98%) of trivalent lanthanides/actinides (^1^4^7Pm, ^1^5^4Eu and ^2^4^1Am), tetravalent actinides (Pu(IV)) and hexavalent actinides (U(VI)) from the aqueous solutions whose acidity had been adjusted to pH 2.5, 1.0 and 0.25mol/L, respectively with dilute HNO"3. The interference of @b-emitting lanthanides, in preconcentration and determination of @a-emitting actinides using S-PIM, were also studied. The @a-scintillation counting efficiency in the S-PIM was found to be 92-95% after discriminating the background noise. However, @b-scintillation counting efficiency was found to be in the range of 12-25% depending upon the energy of @b-particles. It was observed that @b-scintillation pulses from ^1^4^7Pm and ^1^5^4Eu could be discriminated based on pulse height analysis. Thus, @a-activities of the actinides sorbed in the sample of S-PIM could be directly measured in the presence of @b-emitters by scintillation counting. However, the @a-scintillation counting efficiency was reduced to 38% after discriminating @b-scintillation pulses in the S-PIM. The preconcentration ability of S-PIM was examined in tap water and seawater spiked with ^2^4^1Am. The total @a-activity of 46Bq (present in 100mL) could be preconcentrated and measured from tap water using S-PIM.
Description:
The scintillating polymer inclusion membrane (S-PIM) was developed for preconcentration and determination of @a-emitting actinides from aqueous solution. The preparation of S-PIM involved physical immobilization of an extractant bis(2-ethylhexyl)phosphoric acid, primary scintillator 2,5-diphenyloxazole, and secondary scintillator 1,4-bis(2-methylstyryl)benzene in the plasticized cellulose triacetate matrix. The S-PIM was found to be effective for the quantitative sorption (94-98%) of trivalent lanthanides/actinides (^1^4^7Pm, ^1^5^4Eu and ^2^4^1Am), tetravalent actinides (Pu(IV)) and hexavalent actinides (U(VI)) from the aqueous solutions whose acidity had been adjusted to pH 2.5, 1.0 and 0.25mol/L, respectively with dilute HNO"3. The interference of @b-emitting lanthanides, in preconcentration and determination of @a-emitting actinides using S-PIM, were also studied. The @a-scintillation counting efficiency in the S-PIM was found to be 92-95% after discriminating the background noise. However, @b-scintillation counting efficiency was found to be in the range of 12-25% depending upon the energy of @b-particles. It was observed that @b-scintillation pulses from ^1^4^7Pm and ^1^5^4Eu could be discriminated based on pulse height analysis. Thus, @a-activities of the actinides sorbed in the sample of S-PIM could be directly measured in the presence of @b-emitters by scintillation counting. However, the @a-scintillation counting efficiency was reduced to 38% after discriminating @b-scintillation pulses in the S-PIM. The preconcentration ability of S-PIM was examined in tap water and seawater spiked with ^2^4^1Am. The total @a-activity of 46Bq (present in 100mL) could be preconcentrated and measured from tap water using S-PIM.
