Selective separation of radionuclides from environmental matrices using proprietary solid-phase extraction systems: A review

Scalable Dialysis-Based Method for the Isolation of Strontium from Milk for Radioanalysis

“…18,27−31 Among these, solidphase extraction figures prominently, particularly with the development of commercially available supports bearing chelating agents of high specificity. 32 Being convenient, and hence potentially well-suited to emergency response, such substrates typically require a small sample size (≤100 mL) with a preconcentration step via extraction or precipitation, 33−35 while others adhere to sample ashing. 36 To circumvent the need for sample ashing and potentially unreliable preconcentration steps, we wished to explore the possibility of using strontium fixation on cation-exchange resin as a thermodynamic driving force to fully deplete milk of its incorporated strontium across a semipermeable membrane barrier, as illustrated in Figure 1.…”

“…Further, some of the closest analogues to strontium in milk are present at a macroscale; according to global averages, calcium and magnesium concentrations in raw milk are 36,632 μM (1.47 g·L –1 ) and 4792 μM (0.116 g·L –1 ), respectively, while that of strontium is only 6.65 μM (0.58 mg·L –1 ) . To contend with such complexity, many methods have been described for both routine and emergency contexts. ,− Among these, solid-phase extraction figures prominently, particularly with the development of commercially available supports bearing chelating agents of high specificity . Being convenient, and hence potentially well-suited to emergency response, such substrates typically require a small sample size (≤100 mL) with a preconcentration step via extraction or precipitation, − while others adhere to sample ashing. …”

Recent progress in high-performance environmental impacts of the removal of radionuclides from wastewater based on metal–organic frameworks: a review

“…However, LLE has some drawbacks, including complex chemical reactions, the generation of secondary waste streams, and the handling of hazardous chemicals and radioactive materials. 405 Compared to other techniques, MOFs have several advantages, such as high selectivity, capacity, and ease of synthesis. MOFs can be tailored to selectively capture specific radionuclides while ignoring interfering ions in the sample matrix, and they have high adsorption capacities due to their high surface area and porous nature.…”

Synthesis, Characterization and Application of Calcium Ion-Imprinted Polymeric Solid-Phase Extraction and Pre-Concentration in Aqueous Solutions by Packed-Bed Columns

“…The most significant issue is the use of standard stationery stacked in SPE columns. With the retention phase's low selectivity mechanism, it's possible to achieve a desired level of selectivity [10,11]. Here, we investigate the selective separation and preconcentration of the calcium (II) ions from aqueous solutions by the addition of an allyl chloride monomer, resulting in bulk polymerization formation, to determine the calcium ion by flame atomic absorption spectroscopy (FAAS).…”