Optics: measuring and testing – By shade or color – Fluid color transmission examination
Patent
1979-10-04
1981-01-06
Evans, F. L.
Optics: measuring and testing
By shade or color
Fluid color transmission examination
422 68, G01N 2127
Patent
active
042433266
ABSTRACT:
Disclosed is a device for use in the colorimetric analysis of nickel in a emical plating solution. The device employs an automatic measuring system which includes a first automatic measuring system which comprises a means for transferring a chemical plating solution to be analyzed from a container to a first volumetric cup disposed to receive the solution into an inner section of the cup which is filled to overflowing into an outer section of the first volumetric cup. The outer section of the first volumetric cup has means for draining solution to the container. The first volumetric cup inner section is provided with drain means at bottom for draining the plating solution sample into an absorption cell. A second automatic measuring system is provided which comprises a means for transferring a standardized ammonium hydroxide solution by gravity flow from a second container to a second volumetric cup having an inner and outer section. The second volumetric cup inner section is provided with drain means at bottom for draining the standardized ammonium hydroxide solution into an absorption cell. A means for flow control is connected between the second container and inner section of the second volumetric cup. The outer section is disposed for receiving any overflow from the inner section and has means connecting the outer section to a second container for receiving any overflow. The outer section of the second volumetric cup is provided with means for draining the standardized hydroxide solution into a suitable container for ammonium hydroxide. After mixing the plating solution sample and ammonium hydroxide in the absorption cell a blue to violet colored complex is formed. A colorimeter employing a yellow filter (near 580 millimicrons wavelength) or a green filter (near 525 millimicrons wavelength) and a detector is employed to measure the transmittance or the absorption of a monochromatic light that is passed through the colored complex. The detector value is amplified and compared with a detector value measured on a standard sample as corrected by a blank sample to determine the nickel content of the chemical plating solution.
REFERENCES:
patent: 3030192 (1962-04-01), Schneider, Jr.
patent: 3440016 (1969-04-01), Serfass
patent: 3874794 (1975-04-01), Schmitt et al.
Edelberg Nathan
Evans F. L.
Gibson Robert P.
The United States of America as represented by the Secretary of
Voigt Jack W.
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