US4334882A
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Determination of pyrite and siderite content of formation deposits
Assignee: Mobil Oil AS
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Filing: 1981-04-01
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Granted: 1982-06-15
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Expires: 2001-04-01
Abstract
Abstract A method for determination of pyrite and sidermite content in core samples is disclosed wherein the method involves a two-step digestion of the minerals in hydrochloric and nitric acids and analysis of the solutions using an inductively coupled plasma atomic emission spectrometer.
Inventors
- 👤 Joseph T. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:36
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/24; G01N21/00; G01N21/62; G01N21/71; G01N21/73
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A method for determining the concentration of pyrite in a sample comprising the steps of: placing said sample in a hydrochloric acid solution; dissolving a portion of said sample in said hydrochloric acid solution; removing said sample from said hydrochloric acid solution; placing said sample in a nitric acid solution; dissolving a second portion of said sample in said nitric acid solution; removing said sample from said nitric acid solution; and performing an inductively coupled plasma spectrometer analysis of said nitric acid solution and said hydrochloric acid solution to determine the concentration of iron in each solution.
Claim 2
Independent Claim
97 words
A method for determining the concentration of pyrite in a sample comprising the steps of: placing said sample in a hydrochloric acid solution; dissolving a portion of said sample in said hydrochloric acid solution; removing said sample from said hydrochloric acid solution; placing said sample in a nitric acid solution; dissolving a second portion of said sample in said nitric acid solution; removing said sample from said nitric acid solution; and performing an inductively coupled plasma spectrometer analysis of said nitric acid solution and said hydrochloric acid solution to determine the concentration of iron in each solution.
Claim 3
Dependent Claim
63 words
The method according to claim 1 wherein said step of placing said sample in a solution includes the steps of: adding 80 milliliters of deoxygenated 5% hydrochloric acid to said sample; placing said sample and said hydrochloric acid solution in a water bath for one hour; and adding 20 milliliters of 5% hydrochloric acid solution to said sample and said hydrochloric acid solution.
Claim 4
Dependent Claim
64 words
The method according to claim 1 wherein the step of placing said sample in a nitric acid solution includes the steps of: adding the sample of 80 milliliters of 20% nitric acid; allowing the mixture to react slowly at room temperature; adding 40 milliliters of concentrated nitric acid; and heating said sample and said nitric acid solution in the water bath for four hours.
References Cited (Backward Citations)
US3302101A
Cited
US4225314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |