Method validation in solvent extraction for 210Po determination from groundwaters

Abstract

Polonium / Solvent extraction / Drilled well waterSummary. The suitability of solvent extraction for 210 Po analysis from groundwater samples was assessed using three extractive scintillation cocktails, POLEX, TOPO and TNOA. Validation of the extraction method was carried out using both distilled water samples with some radionuclides added and real groundwater samples. Extraction of polonium from spiked waters was successful and no co-extraction of 234 U or 238 U occurred. However, the extraction results from groundwaters differed greatly from the spiked water samples. The main interfering nuclides were 234 U and 238 U, which led to incorrect results in 210 Po analysis. Due to the co-extraction of uranium from real groundwaters, validation of the method was unfeasible.

Review of Chemical and Radiotoxicological Properties of Polonium for Internal Contamination Purposes

“…Numerous solvent extractants such as methyl isobutyl ketone (MIBK), isopropyl ether, and tributyl phosphate (TBP) are available for extraction or separation of polonium. Among the different extraction techniques for polonium, liquid–liquid extraction is currently used with solvents such as diethylammonium diethyldithiocarbamate DDTC, dithizone or copper dithizone in CCl 4 , carbon tetrachloride (CCl 4 ), or Tri- n -octylphosphine oxide (TOPO), as well as a technique using extraction chromatography with strontium resin …”

“…Among the different extraction techniques for polonium, liquid−liquid extraction is currently used with solvents such as diethylammonium diethyldithiocarbamate DDTC, 41 dithizone or copper dithizone in CCl 4 , 42 carbon tetrachloride (CCl 4 ), or Tri-noctylphosphine oxide (TOPO), as well as a technique using extraction chromatography with strontium resin. 43 Remark. due to its high specific activity of 1.66 × 10 14 Bq/g, the intense radiation of polonium samples can quickly decompose most organic complexing agents and even the solvents, and crystal structures of solids can be quickly altered or destroyed.…”

Presença De Polônio-210 No Tabaco: Uma Revisão Sistemática

“…Para a determinação de 210 Po em amostras ambientais, são utilizados vários métodos, incluindo a deposição espontânea em placas de prata ou níquel, medidas por espectrometria de partículas alfa, usando um semicondutor ou ZnS (Ag) detector de partículas alfa, cromatografia, técnicas de eletrodeposição, extração em cocktail de cintilação, membranas de contenção metálica e troca iônica (JOKELAINEN et al, 2010; DLUGOSZ-LISIECKA; WRÓBEL, 2014). É necessário extrair previamente o Urânio da amostra, para que este não aja como interferente (JOKELAINEN et al, 2010). A espectroscopia de partículas alfa foi o método de exame mais encontrado para a determinação de amostras em fezes, urina e cabelo (RÄÄF et al, 2015).…”