US4080171A
Expired / Lapsed
US
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Rapid analysis of trace components contained in a liquid
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1976-08-09
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Granted: 1978-03-21
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Expires: 1996-08-09
Abstract
Abstract A method for the rapid analysis of trace components in a liquid, which comprises filtering said liquid through a filter paper having at least one of anion exchange functional groups and chelating ion binding functional groups, thus collecting substantially the entire amount of the objective components (anions or chelating ions) contained in said liquid on the filter paper, and analyzing the anion- or chelating ion-loaded filter paper as such or after drying, or analyzing the eluate obtained by elution of the anions or chelating ions to be analyzed from said filter paper.
Inventors
- 👤 Takezo Sano
- 👤 Akira Kobayashi, deceased
- 👤 successor by Shuko Kobayashi
- 👤 guardian Tsutomu Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:31
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1813; B; B01; B01J; B01J45/00; G01N30/00; G01N30/96
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
A method for the rapid analysis of anions and/or chelating ions contained in a liquid, which comprises filtering a sample of said liquid through a filter paper made from pulp having at least one of anion exchange functional groups and chelating ion binding functional groups, at a space velocity of said liquid sample through said filter paper of 1 to 10,000 hr -1 in terms of linear velocity (cm/hr)/thickness (cm), to collect substantially the entire amount of said anions and/or chelating ions contained in the liquid sample on the filter paper, and analyzing said anion- or chelating ion-loaded filter paper.
Claim 2
Independent Claim
100 words
A method for the rapid analysis of anions and/or chelating ions contained in a liquid, which comprises filtering a sample of said liquid through a filter paper made from pulp having at least one of anion exchange functional groups and chelating ion binding functional groups, at a space velocity of said liquid sample through said filter paper of 1 to 10,000 hr -1 in terms of linear velocity (cm/hr)/thickness (cm), to collect substantially the entire amount of said anions and/or chelating ions contained in the liquid sample on the filter paper, and analyzing said anion- or chelating ion-loaded filter paper.
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
23 words
A method according to claim 1 wherein the filter paper containing said functional group is polyethylene, polypropylene, polystyrene, polyvinyl chloride or a cellulose.
Claim 5
Dependent Claim
34 words
A method according to claim 1, wherein the anion exchange functional group is a primary, secondary or tertiary amino group, a quaternary ammonium group Or a group containing a pyridine nucleus or pyridinium nucleus.
Claim 6
Dependent Claim
34 words
A method according to claim 1, wherein the chelating ion binding functional group is a thiourea, phenylthiourea, thiosemicarbazide, thiocarbazide, dithiocarbamate, dithiocarbamic acid, dithioic acid, thiol, polythiol, acetamino, iminodiacetato, o-aminophenol, ethylenediamino, polyethylenepolyamine or resorcinol group.
Claim 7
Dependent Claim
18 words
A method according to claim 1, wherein the filter paper has a thickness of 0.1 to 5 mm.
Claim 8
Dependent Claim
26 words
A method according to claim 1, wherein the filter paper has an anion exchange capacity and/or a chelating ion binding capacity of 0.1 to 10 meq/g.
Claim 9
Dependent Claim
47 words
A method according to claim 1, wherein the filter paper has a water permeability of 1 to 1,000 seconds, in terms of filtration time required for 1 cc of water to be filtered through 1 cm 2 of filter paper under a water head of 10 cm.
Claim 10
Dependent Claim
44 words
A method according to claim 1, wherein the analysis of said anion- or chelating ion-loaded filter paper is carried out by measuring the anion or chelating ion on the filter paper by X-ray fluorescence analysis after drying the anion- or chelating ion-loaded filter paper.
Claim 11
Dependent Claim
25 words
A method according to claim 1, wherein the space velocity of the liquid sample through the filter paper is 10 to 1,000 hr -1 .
Claim 12
Dependent Claim
56 words
A method according to claim 1, wherein the analysis of the anion- or chelating ion-loaded filter paper is carried out by measuring the anion or chelating ion in the eluate obtained by elution of the objective anion or chelating ion from said anion- or chelating ion-loaded filter paper by means of the method of atomic absorption.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |