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P. Rajec Comenius University Department of Nuclear Chemistry Mlynska dolina Ch-I 842 15 Bratislava Slovak Republic

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V. Švec Comenius University Department of Nuclear Chemistry Mlynska dolina Ch-I 842 15 Bratislava Slovak Republic

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V. Mikulaj Comenius University Department of Nuclear Chemistry Mlynska dolina Ch-I 842 15 Bratislava Slovak Republic

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R. Hanzel Comenius University Department of Nuclear Chemistry Mlynska dolina Ch-I 842 15 Bratislava Slovak Republic

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Abstract  

Lead as well as strontium form low solubility compounds of composition (ML2)2A·nH2O, (M=Pb2+, Sr2+), in the presence of 15-crown-5 (L) and tungstosilicic acid (H4A) in acid media as found by radiometric precipitation titration. “Sandwich” structure of crown-ether complexes of lead and strontium could be expected due to the small size of cavity of 15-crown-5. Coprecipitation of PbL2/su2+ with crown complexes of strontium cation after adding tungstosilicic acid was studied in 0.01 mol·dm−3 HNO3. A significant influence of H+ cation in 1 mol·dm−3 HNO3 on coprecipitation of lead was observed. Formation of HL+ complexes by protonisation of 15-crown-5 competes to the formation of ML22+ complexes (approximately twenty percent of 15-crown-5 are used for creation of HL+ complexes). Formation of low solubility salts was utilised for separation of lead from strontium in 0.01 mol·dm−3 HNO3. The ratio of constant stability of lead and strontium β‘ with 15-crown-5 in 0.01 mol·dm−3 HNO3 was calculated. The separation factor S(Pb/Sr) depends on the ratio of stability constants βPbL2SrL2 The precipitation method can be used for separation of metals with high constant stability with crown ethers from solutions containing other metals in the case of gradual addition of crown.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)