Robert Saltzman

US Patent:

43805868, Apr 19, 1983

Filed:

Oct 13, 1981

Appl. No.:

6/310451

Inventors:

Robert S. Saltzman - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

G01N 2175

US Classification:

436121

Abstract:

A method and an apparatus for photometrically analyzing the hydrogen sulfide concentration in a stream containing at least a first predetermined concentration of bonded hydrogen sulfide-amines and ultraviolet radiation-absorbing impurities is characterized by isolating a first, reference, sample of the stream and removing the hydrogen sulfide from the reference sample until a second, lower, predetermined concentration remains. Thereafter, the first, reference, sample is photometrically analyzed and a reference signal representative of the ultraviolet radiation-absorbing characteristics of the first, reference, sample is produced. The reference signal is thereafter used in the photometric analysis of a second sample to produce a signal representative only of the hydrogen sulfide concentration in the second sample.

US Patent:

39415635, Mar 2, 1976

Filed:

Apr 23, 1974

Appl. No.:

5/463309

Inventors:

Robert S. Saltzman - Wilmington DE

Assignee:

E. I. Du Pont de Nemours & Company - Wilmington DE

International Classification:

G01N 3318
G01N 2126

US Classification:

23230R

Abstract:

Disclosed herein is a process and apparatus for quantitatively determining the amount of hexavalent chromium (CR. sup. sup. +6) in a process stream by comparing the optical density of the process stream with a reference sample produced by reducing Cr. sup. sup. +6 to Cr. sup. sup. +3 by contacting it with a sulfur dioxide reducing agent.

US Patent:

39696260, Jul 13, 1976

Filed:

Feb 18, 1975

Appl. No.:

5/550852

Inventors:

Robert S. Saltzman - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

G01J 100

US Classification:

250344

Abstract:

Disclosed herein is a method for detecting total reduced sulfur in a sample gas, comprising the steps of: introducing sample gas into a sample cell, passing detecting radiation of a wavelength between about 250 and about 330 nm. through the sample gas, detecting the intensity of the detecting radiation passing through the sample gas, introducing an oxygen-containing gas into the cell to form a gas mixture with a sample gas, heating the gas mixture to a temperature above about 200. degree. C. , passing the detecting radiation through the heated gas mixture in the cell, and detecting the intensity of the detecting radiation passing through the gas mixture. The difference between the intensity of the detecting radiation passing through the gas mixture and that passing through the sample gas alone is indicative of the total reduced sulfur content of the sample gas. An apparatus to practice the above method is also disclosed.

US Patent:

43114857, Jan 19, 1982

Filed:

Dec 23, 1980

Appl. No.:

6/220200

Inventors:

Robert S. Saltzman - Wilmington DE
James W. Williams - San Jose CA

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

G01N 2001
G01N 3334

US Classification:

23230R

Abstract:

A method and an apparatus for photometrically analyzing a stream under test containing both chlorine and chlorine dioxide is characterized by heating a portion of the stream to decompose any chlorine dioxide therein into elemental chlorine. This heated portion of the stream is photometrically analyzed to determine the concentration of chlorine produced by the decomposition of chlorine dioxide, taking into account the concomitant dilution produced thereby.