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Patent US4500431A successfully refreshed from Google Patents.
US4500431A
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Separation of analysis of anions
Assignee: Tosoh Corp
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Filing: 1983-11-04
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Granted: 1985-02-19
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Expires: 2003-11-04
Abstract
Abstract This invention makes a rapid and accurate anion separation analysis possible by using an electric conductivity detector built in a chromatographic apparatus and a binary composite solution as an eluent. The binary composite solution: borax and an aliphatic acid/an aromatic acid/a saccharic acid/a sugar is used in alkaline regions, while the binary composite solution: a sulphonic acid and boric acid/a monocarboxylic acid is used in acid regions. Over a conventional analysis employing phthalic acid or benzoic acid singly, this analysis has an advantage in capturing a wider variety of anions on chromatograph with high accuracy in more sensitized condition without suffering a hindrance due to noises or peaks having nothing to do with objective anions because the electric conductivity of the eluent itself is very low.
Inventors
- 👤 Akiyoshi Miyanaga
- 👤 Yukitada Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:06
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N30/26; G01N30/28; G01N30/34
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
86 words
A separation analysis of anions through liquid chromatography, which is characterized in that a solution prepared by mixing two components A and B is used as an eluent, where the component A is at least one compound selected from the group consisting of an aliphatic polycarboxylic acid, an aliphatic hydroxycarboxylic acid, an aromatic organic acid, a saccharic acid, a sugar and a sulphonate and the component B is at least one compound selected from the group consisting of borax, boric acid and an aliphatic monocarboxylic acid.
Claim 2
Dependent Claim
86 words
A separation analysis of anions through liquid chromatography, which is characterized in that a solution prepared by mixing two components A and B is used as an eluent, where the component A is at least one compound selected from the group consisting of an aliphatic polycarboxylic acid, an aliphatic hydroxycarboxylic acid, an aromatic organic acid, a saccharic acid, a sugar and a sulphonate and the component B is at least one compound selected from the group consisting of borax, boric acid and an aliphatic monocarboxylic acid.
Claim 3
Dependent Claim
20 words
A separation a of anions as set forth in claim 1, in which Component A is an aliphatic dicarboxylic acid.
Claim 4
Dependent Claim
21 words
A separation analysis of anions as set forth in claim 1, in which the Component A is an aliphatic tricarboxylic acid.
Claim 5
Dependent Claim
20 words
A separation analysis of anion as set forth in claim 1, in which the Component A is a hydroxydicarboxylic acid.
Claim 6
Dependent Claim
20 words
A separation analysis of anions as set forth in claim 1, in which the Component A is a dihydroxydioarboxylic acid.
Claim 7
Dependent Claim
19 words
A separation analysis of anion a forth in claim 1, in which the Component A is a hydroxytricarboxylic acid.
Claim 8
Dependent Claim
19 words
A separation analysis of anions as set forth in claim 1, in which the Component A is a mono-saccharide.
Claim 9
Dependent Claim
33 words
A separation analysis of anions as set forth in claim 1, in which a solution prepared from a sulphonate (component A) and an aliphatic monocarboxylic acid (component B) is used as an eluent.
Claim 10
Dependent Claim
31 words
A separation analysis of anions as set forth in claim 1, in which a solution prepared from a sulphonate (component A) and boric acid (component B) is used as an eluent.
Claim 11
Dependent Claim
16 words
A separation analysis of anions as set forth in claim 1 wherein component B is borax.
Claim 12
Dependent Claim
19 words
A separation analysis of anions as set forth in claim 1 in which the component B is boric acid.
Claim 13
Dependent Claim
34 words
A separation analysis of anions as st forth in claim 1 in which the component B is an aliphatic monocarboxylic acid selected from the group consisting of forming acid, cetic acid and propionic acid.
Claim 14
Dependent Claim
96 words
A separation analysis of anions as set forth in claim 1 for the quantitative analysis of chloride ion, nitrite ion, bromide ion, nitrate ion, sulfate ion, and phosphate ion, in which the eluent comprises as a component A at least one of said aliphatic polycarboxylic acid, aliphatic hydroxcarboxylic acid, aromatic organic acid, saccharide acid and sugar, and the component B comprises at least borax, wherein the concentration of component A and component B is in the range of 1×10 -4 to 5×10 -3 mol, and wherein the eluent has a pH in the range of 7.5-11.0.
Claim 15
Dependent Claim
22 words
A separation analysis as set forth in claim 13 wherein the eluent has a pH in the range of 8.5 to 9.5.
Claim 16
Dependent Claim
80 words
A separation analysis of anions as set forth in claim 1 wherein the eluent is composed of the sulfonate as component A and component B comprises boric acid or the aliphatic monocarboxylic acid, and wherein the concentration of component A is in the range of 1×10 -4 to 5×10 -3 mol, and the concentration of component B is in the range of 1×10 -2 to 1×10 -1 mol, and wherein the eluent has a pH in the range of 3.0-6.0.
Claim 17
Dependent Claim
27 words
A separation analusis of anions as set set forth in claim 15 wherein the pH of the eluent is in the rane of from 4.5 to 5.5.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |