Chemistry: analytical and immunological testing – Metal or metal containing – Organometallic compound determined
Patent
1989-04-10
1990-12-04
Cintins, Ivars
Chemistry: analytical and immunological testing
Metal or metal containing
Organometallic compound determined
210670, 210662, 210679, 210688, 436 80, 436 81, 436178, G01N 3000, C02F 162
Patent
active
049753797
ABSTRACT:
The invention is a process of selectively and quantitatively removing and concentrating at least one selected ion prosent in low concentration with other ions in higher concentration in a multiple ion solution. The method comprises bringing a complexing agent for the selected ion(s) into contact with a different determined quantity of said multiple ion solution to remove and concentrate the selected ion(s) from the multiple ion solution; removing the multiple ion solution, from which the complexing agent has been removed, the selected ions from the complexing agent having the selected ion(s) complexed therewith, bringing the complexing agent complexed with selected ion(s) into contact with a determined quantity of receiving liquid to break the complex and remove the selected and concentrated ion(s) from the complexing agent therein, and determining the concentration of selected ion(s) in said receiving liquid from which the concentration of selected ion(s) in the multiple ion solution can be calculated. The metal ions in low concentration are often heavy metal ions, such as lead ions, and the process finds particularly advantageous utility in the determination of lead content in ppb in drinking water.
The preferred apparatus for carrying out the process is a column packed with silica gel or silica-bonded macrocycle as the complexing agent which is preferably carried out using as the complexing agent a macrocyclic compound having at least four --A--CH.sub.2 --CH.sub.2 --groups in which A is selected from --O--, --O--CH.sub.2 --, --S--, --S--CH.sub.2 --, --N--R--, and --N--((R)--CH.sub.2 in which R is selected from H, lower alkyl and benzyl and which has a hydrocarbon side chain having an end group. ##STR1## covalently bonded to silica in which X is selected from lower alkly, benzyl, phenyl, halogen, --O--CH.sub.2, --O--C.sub.2 H.sub.5 and Si.sub..dbd..sup.-. Typical compounds within this generic definition consist of the following groups of compounds wherein the macrocycle is bonded to the silica through a hydrocarbon side chain with or without an ether oxygen: ##STR2## in which Silica is sand or silica gel.
REFERENCES:
patent: 4070284 (1978-01-01), Fujita et al.
patent: 4659512 (1987-04-01), Macedo et al.
Alldredge Robert
Bradshaw Jerald S.
Bruening Ronald L.
Christensen Virginia B.
Izatt Reed M.
Brigham Young University
Cintins Ivars
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