Preliminary results on the immobilisation of radionuclides from waters with specific adsorbers based on phosphate salts.
The present paper is focused on the ability of aluminium phosphate (ALPC), magnesium ammonium phosphate (MGPC), magnesium hydrogen phosphate (MGHPC), and calcium hydrogenphosphate (CAHPC), adsorbed onto charcoal, to immobilise actinides by adsorption from natural waters. The objective of this process is to evaluate the environmental pollution due to the actinides. Europium, thorium, protactinium, neptunyl, and uranyl ions were chosen to simulate actinides in the +3, +4, +5 and +6 oxidation state. The adsorbers were tested using natural waters samples. The adsorption trends and capacities were analysed. ALPC and MGPC exhibited a similar behaviour and adsorbed demonstrating that the +5, +4 and +3 actinide ions can be easily immobilised from natural waters and may be successfully used at pH 7-8. MGHPC may be used at a higher pH, whereas CAHPC is effective in the whole pH range. In all cases, thorium, protactinium and europium were strongly
Valentini Ganzerli
Maria Teresa
MT
Dipartimento di Chimica Generale dell' Università di Pavia, Viale Taramelli 12, 27100 Pavia, Italy. elisa@unipv.it
Maggi
Luigino
L
Crespi Caramella
Vera
V
Berzero
Antonella
A
D008671:Actinoid Series Elements / Q000032:analysis / Q000737:chemistry*; D000327:Adsorption; D017607:Aluminum Compounds / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry; D002606:Charcoal; D004785:Environmental Pollutants / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007477:Ions; D017616:Magnesium Compounds / Q000737:chemistry; D010084:Oxidation-Reduction; D010710:Phosphates / Q000032:analysis* / Q000737:chemistry; D011868:Radioisotopes / Q000737:chemistry* / Q000302:isolation & purification; D014867:Water / Q000737:chemistry*
D008671:Actinoid Series Elements; D017607:Aluminum Compounds; D002130:Calcium Phosphates; D004785:Environmental Pollutants; D007477:Ions; D017616:Magnesium Compounds; D010710:Phosphates; D011868:Radioisotopes; D014867:Water; D002606:Charcoal