US3967932A
Expired / Lapsed
US
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Rapid analysis of cation contained in liquid
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1975-10-10
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Granted: 1976-07-06
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Expires: 1995-10-10
Abstract
Abstract A method for the rapid analysis of a cation contained in a liquid, which comprises filtering a liquid sample through a cation exchange filter paper having a high rate of ion exchange, which was made from fibers having cation exchange functional groups, thus collecting substantially the entire amount of the cation contained in said liquid sample in the top surface layer of said filter paper, and analyzing the cation-loaded filter paper as such or the eluate obtained by elution of the cation to be analyzed from said cation-loaded filter paper, to determine the cation.
Inventors
- 👤 Takezo Sano
- 👤 Akira Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:57
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/96; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A method for the rapid analysis of a cation contained in a liquid, which comprises filtering a liquid sample through a cation exchange filter paper having a high rate of ion exchange, which is composed of fibers having cation exchange functional groups, thus collecting in the top surface layer of said filter paper substantially the entire amount of the cation contained in said liquid sample, and analyzing the cation-loaded filter paper as such or the eluate obtained by elution of the objective cation from said cation-loaded filter paper to determine the cation.
Claim 2
Independent Claim
92 words
A method for the rapid analysis of a cation contained in a liquid, which comprises filtering a liquid sample through a cation exchange filter paper having a high rate of ion exchange, which is composed of fibers having cation exchange functional groups, thus collecting in the top surface layer of said filter paper substantially the entire amount of the cation contained in said liquid sample, and analyzing the cation-loaded filter paper as such or the eluate obtained by elution of the objective cation from said cation-loaded filter paper to determine the cation.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein each of the unit fibers composing the filter paper has a diameter of 0.5 to 100 μ.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein the filter paper is composed of fibers resistant to acids, alkalis, and solvents.
Claim 5
Dependent Claim
23 words
A method according to claim 1, wherein a starting material of the fiber is a pulp of polyethylene, polypropylene, polystyrene, or polyvinyl chloride.
Claim 6
Dependent Claim
25 words
A method according to claim 1, wherein the cation exchange functional group is sulfonic acid, carboxylic acid, phosphonic acid, sulfate ester, or phosphate ester group.
Claim 7
Dependent Claim
22 words
A method according to claim 1, wherein the cation exchange filter paper has an ion exchange capacity of 0.1 to 10 meq/g.
Claim 8
Dependent Claim
47 words
A method according to claim 1, wherein the cation exchange filter paper has a water permeability of 1 to 1,000 seconds, in terms of filtration time required to filter 1 cc of water under a head of 10 cm Aq through 1 cm 2 of filter paper.
Claim 9
Dependent Claim
20 words
A method according to claim 1, wherein the cation exchange filter paper has a thickness of 0.1 to 5 mm.
Claim 10
Dependent Claim
34 words
A method according to claim 1, wherein the space velocity of the liquid sample through the cation exchange filter paper is 1 to 10,000 hr - 1 in terms of linear velocity (cm/hr)/thickness (cm).
Claim 11
Dependent Claim
19 words
A method according to claim 1, wherein the analysis is carried out by the method of X-ray fluorescence analysis.
Claim 12
Dependent Claim
27 words
A method according to claim 10, wherein the space velocity of the liquid sample through the cation exchange filter paper is 1,000 hr - 1 or less.
Claim 13
Dependent Claim
44 words
A method according to claim 1, wherein the analyzing of the cation-loaded filter paper is carried out by measuring the cation in the eluate obtained by elution of the objective cation form said cation-loaded filter paper by means of the method of atomic absorption.
References Cited (Backward Citations)
US3408291A
Cited
US3155454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |