Patent US3884639A successfully refreshed from Google Patents.
US3884639A
Expired / Lapsed
US
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Process for analyzing mercury
Assignee: Sugiawa-Gen Iriki KK
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Filing: 1974-02-04
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Granted: 1975-05-20
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Expires: 1994-02-04
Abstract
Abstract A process for quantitatively analyzing mercury in incineratable samples which comprises heating a mercury-containing sample in the presence of oxygen to effect complete incineration of the sample and form a vapor containing atomic mercury, passing such vapor through a heated glass tube containing a basic salt, cooling the vapor, bringing the cooled vapor into contact with a metal capable of amalgamation to capture the mercury as an amalgam, heating the amalgam to regenerate mercury vapor and measuring the quantity of that vapor. According to this invention, the quantitative analysis of mercury can be attained rapidly and automatically in a simple and precise manner without application of a particular preliminary treatment.
Inventors
- 👤 Yunosuke Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:34
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/12; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A PROCESS FOR QUANTITATIVELY ANALYZING MERCURY WHICH COMPRISES HEATING A MERCURY CONTAINING SAMPLE IN THE PRESENCE OF OXYGEN TO EFFECT COMPLETE INCINERATION OF THE SAMPLE TO FORM A VAPOR CONTAINING ATOMIC MERCURY, PASSING SUCH VAPOR THROUGH A HEATED GLASS TUBE CONTAINING A BASIC SALT, COOLING THE VAPOR, BRINGING THE COOLED VAPOR INTO CONTACT WITH A METAL CAPABLE OF AMALGAM TO REGENERATE MERCURY VAPOR AMALGAM, HEATING THE AMALGAM TO REGENERATE MERCURY VAPOR AND MEASURING THE QUNATITY OF THE MERCURY VAPOR.
Claim 2
Dependent Claim
79 words
A PROCESS FOR QUANTITATIVELY ANALYZING MERCURY WHICH COMPRISES HEATING A MERCURY CONTAINING SAMPLE IN THE PRESENCE OF OXYGEN TO EFFECT COMPLETE INCINERATION OF THE SAMPLE TO FORM A VAPOR CONTAINING ATOMIC MERCURY, PASSING SUCH VAPOR THROUGH A HEATED GLASS TUBE CONTAINING A BASIC SALT, COOLING THE VAPOR, BRINGING THE COOLED VAPOR INTO CONTACT WITH A METAL CAPABLE OF AMALGAM TO REGENERATE MERCURY VAPOR AMALGAM, HEATING THE AMALGAM TO REGENERATE MERCURY VAPOR AND MEASURING THE QUNATITY OF THE MERCURY VAPOR.
Claim 3
Dependent Claim
16 words
A process according to claim 1 wherein the sample is heated in the range of 400*-1,100*C.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein the incineration vapor is entrained in a carrier gas for passage through said tube.
Claim 5
Dependent Claim
22 words
A process according to claim 3 wherein the carrier gas is selected from the group consisting of oxygen and an oxygen-containing gas.
Claim 6
Dependent Claim
17 words
A process according to claim 1 wherein the basic salt is a carbonate of an alkali metal.
Claim 7
Dependent Claim
18 words
A process according to claim 1 wherein the metal capable of amalgamation is carried on a heat-resisting support.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein the metal capable of amalgamation is platinum.
Claim 9
Dependent Claim
119 words
An incineration apparatus for analyzing organic samples for mercury which comprises a sample incineration zone provided with an external heating means and an inlet for a carrier gas, an acidic gas absorbing zone receiving the gas from said incineration zone and provided with a basic salt and an external heating means, a cooling zone to condensate water from the incineration gas after passage through said absorbing zone, a mercury-capturing zone provided with a metal capable of amalgamation and an external heating means operable to heat the resultant amalgam for regenerating mercury vapor from the amalgam, and an outlet from said capturing zone for venting the carrier gas and for delivering said regenerated vapor to a mercury vapor measuring means.
Claim 10
Dependent Claim
119 words
An incineration apparatus for analyzing organic samples for mercury which comprises a sample incineration zone provided with an external heating means and an inlet for a carrier gas, an acidic gas absorbing zone receiving the gas from said incineration zone and provided with a basic salt and an external heating means, a cooling zone to condensate water from the incineration gas after passage through said absorbing zone, a mercury-capturing zone provided with a metal capable of amalgamation and an external heating means operable to heat the resultant amalgam for regenerating mercury vapor from the amalgam, and an outlet from said capturing zone for venting the carrier gas and for delivering said regenerated vapor to a mercury vapor measuring means.
Claim 11
Dependent Claim
16 words
An apparatus according to claim 8 wherein the sample incineration zone is filled with a filler.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |