ISSN:
0268-2605
Keywords:
Lead-210
;
organolead
;
synthesis
;
migration
;
plant tissue
;
analysis
;
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
An improved synthetic route to [210Pb]-(CH3)3PbCl is described in which chelated 210Pb2+ is methylated to [210Pb]-(CH3)4Pb with methylmagnesium bromide (CH3MgBr) in the presence of methyl iodide. Controlled oxidation of the product with anhydrous hydrochloric acid and purification of the crude product by reversed-phase high-pressure liquid chromotography (HPLC) resulted in [210Pb]-(CH3)3PbCl in 71% radiochemical yield. Whereas storage of the purified product at -10 °C resulted in complete conversion to Pb2+ during one year, storage in 20% acetic acid at 4 °C resulted in less than 15% decomposition during six months. Periodic complexometric extractions to remove 210Pb radioactive daughters (210Bi, 100% β, Emax = 1.16 MeV; 210Po, 100% α, E = 5.305 MeV) from the storage solution did not alter the rate of decomposition. The rate of translocation of [210Pb]-(CH3)3Pb+ across an isolated tomato cuticle was approximately twice the rate of transfer of inorganic lead(II) and was not influenced by the presence of increasing amounts of disodium ethylenediamine-tetra-acetate.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aoc.590030109
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