US4545957A
Expired / Lapsed
US
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Analysis system for determining copper content in waste water
Assignee: Siemens AG
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Filing: 1982-02-04
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Granted: 1985-10-08
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Expires: 2002-02-04
Abstract
Abstract An analysis system for determining total copper content in waste-water, as from a galvanizing system, comprises periodically taking samples from such waste-water, acidifying such samples with a metalliferous acid containing a metal which forms a strong cyanogen complex and which exhibits a larger electro-negative potential than copper, such as Pd, reducing cupric ions to cuprous ions, adjusting the pH of the resulting sample solution, adding a copper color-forming reagent, such as bathocuprione disulfonic acid salt, and determining the color content by colorimetry. In order to determine a reagent value, a prepared waste-water sample can be subjected to colorimetry before and after addition of the color-forming reagent.
Inventors
- 👤 Jacky Vanhumbeeck
- 👤 Laurent Danneels
- 👤 Hubert De Steur
- 👤 Guido Heyneman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:56
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1813
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
352 words
An automatic analysis device for determining total copper content in a waste-water containing an unknown amount of copper, comprising: a first container and a second container, means for periodically taking aqueous samples from such waste-water and for transferring such samples to said first container to form a sample batch in said first container; means for mixing said sample batch taken in said first container; means for adding to, and acidifying said sample batch in said first container with, a predetermined amount of a predetermined liquid that incorporates a metalliferous acid containing a metal which forms a cyanogen complex and which exhibits a larger electronegative potential than copper; means for transferring a predetermined portion of the resulting so acidified sample batch from said first container to said second container; means for mixing said predetermined portion in said second container; means for adding a predetermined amount of a predetermined reducing agent solution to said second container so as to reduce any bivalent copper present in said predetermined portion to monovalent copper; means for adding a predetermined amount of a predetermined buffer solution to said second container so as to adjust the pH of said predetermined portion to a value in the range from about 3.5 through 11; means for adding a predetermined amount of a predetermined color-forming reagent solution for copper to said second container; a colorimetric measuring bulb means, means for transferring a predetermined quantity of the resulting such predetermined portion from said second container into said colorimetric measuring bulb means; means including a microprocessor for measuring an absorption value for the intensity of a transmitted light which is passed through said predetermined quantity in said measuring bulb means; means for determining the self-coloration and turbidity of said so adjusted predetermined portion whereby the intensity, A, of light transmitted through a predetermined quantity of said so adjusted predetermined portion before the addition of said color-forming reagent is measured and the absorption value k (log A-log B) thereof is calculated with the aid of said microprocessor, wherein k is the calibration factor, and means for sequencing and controlling the operation of said analysis device.
Claim 2
Dependent Claim
352 words
An automatic analysis device for determining total copper content in a waste-water containing an unknown amount of copper, comprising: a first container and a second container, means for periodically taking aqueous samples from such waste-water and for transferring such samples to said first container to form a sample batch in said first container; means for mixing said sample batch taken in said first container; means for adding to, and acidifying said sample batch in said first container with, a predetermined amount of a predetermined liquid that incorporates a metalliferous acid containing a metal which forms a cyanogen complex and which exhibits a larger electronegative potential than copper; means for transferring a predetermined portion of the resulting so acidified sample batch from said first container to said second container; means for mixing said predetermined portion in said second container; means for adding a predetermined amount of a predetermined reducing agent solution to said second container so as to reduce any bivalent copper present in said predetermined portion to monovalent copper; means for adding a predetermined amount of a predetermined buffer solution to said second container so as to adjust the pH of said predetermined portion to a value in the range from about 3.5 through 11; means for adding a predetermined amount of a predetermined color-forming reagent solution for copper to said second container; a colorimetric measuring bulb means, means for transferring a predetermined quantity of the resulting such predetermined portion from said second container into said colorimetric measuring bulb means; means including a microprocessor for measuring an absorption value for the intensity of a transmitted light which is passed through said predetermined quantity in said measuring bulb means; means for determining the self-coloration and turbidity of said so adjusted predetermined portion whereby the intensity, A, of light transmitted through a predetermined quantity of said so adjusted predetermined portion before the addition of said color-forming reagent is measured and the absorption value k (log A-log B) thereof is calculated with the aid of said microprocessor, wherein k is the calibration factor, and means for sequencing and controlling the operation of said analysis device.
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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |