The Use of Inorganic Ion Exchangers for the Removal of Cesium and Strontium from Milk

Abstract

A number of inorganic ion exchangers were evaluated for their ability to remove Cs and Sr from milk. The synthetic exchangers titanium phosphate, zirconium phosphosilicate and sodium titanate or combinations of these removed up to 95% of the Cs and 54% of the Sr. Disadvantages of the use of these compounds were their high cost and the large pH change of the milk caused by the treatment. Natural zeolitic samples with high clinoptilolite content removed more than 90% of the Cs and 25% of the Sr without changing the pH. The composition of the treated milk was within the ranges normally found for milk from different sources. A trained tasting panel found the treated milk to be suitable for human consumption.

Microcrystalline Hexagonal Tungsten Bronze. 1. Basis of Ion Exchange Selectivity for Cesium and Strontium

“…Zeolites are the archetypal inorganic ion exchangers, and it is their tunnel architectures that are at least in part responsible for the very high selectivity they display for different elements. The natural zeolite, clinoptilolite, is the most abundant of the natural zeolites and has attracted considerable attention for the removal of heavy metals from a variety of aqueous solutions including mine wastes, milk, and drinking water . Clinoptilolite has also attracted considerable interest in the radioactive waste management context, owing to its excellent selectivity for cationic species such as Cs + . − While clinoptilolite can easily extract small concentrations of Cs + from solutions having a high background concentration of other cations, and although its stability to ionizing radiation is good, its hydrolytic stability is limited, and therefore it is probably better suited to groundwater treatment rather than to treatment of acidic radioactive waste streams.…”

“…Zeolites are the archetypal inorganic ion exchangers, and it is their tunnel architectures that are at least in part responsible for the very high selectivity they display for different elements. The natural zeolite, clinoptilolite, is the most abundant of the natural zeolites and has attracted considerable attention for the removal of heavy metals from a variety of aqueous solutions including mine wastes, 2 milk, 3 and drinking water. 4 Clinoptilolite has also attracted considerable interest in the radioactive waste management context, owing to its excellent selectivity for cationic species such as Cs + .…”

Μελετη Της Δεσμευσης Ραδιενεργων Ρυπων Απο Υποστυλωμενα Φυλλομορφα Αργιλοπυριτικα Υλικα

“…Οι τιμές της CEC των ανόργανων ενώσεων προέρχονται κυρίως από τον Clearfield (1988) και τους Lagaly και Beneke (1991). Villiers et al, 1991;Vavrova et aU 19913-6 Garcia et al, 1992Bronic et a/, 1992Liang et al, 1993Lukac et a/, 1994 σιδηροκυανιούχες ενώσεις 2. ΡΑΔΙΕΝΕΡΓΟΙ ΡΥΠΑΝΣΗ απο3λήτων στην περιοχή του Sellafield (Avery, 1995) ή στην εταιρεία West Valley Nuclear Services (Bibler, 1990).…”