Ronald K Myers

US Patent:

48943460, Jan 16, 1990

Filed:

Oct 11, 1983

Appl. No.:

6/540330

Inventors:

Ronald R. Myers - Coraopolis PA
Jack E. Fink - Darlington PA

Assignee:

Calgon Corporation - Pittsburgh PA

International Classification:

G01N 2178
G01N 3344

US Classification:

436 85

Abstract:

The instant invention is directed to a method for determining the concentration of sulfonate and/or polycarboyxlate compounds in an aqueous solution comprising: (a) adjusting the pH of a portion of the aqueous solution to less than 3. 0 when measuring sulfonate concentration or to between 3. 0 and 12. 0 when measuring polycarboxylate concentration; (b) adding an effective amount of an aqueous solution containing a metachromatic dye to the pH-adjusted portion of Step (a); (c) measuring the absorbance of the admixture resulting from Step (b) at a wavelength between 300 nm and 700 nm; and (d) comparing the absorbance from Step (c) with absorbances of standard samples containing known concentrations of sulfonate and/or polycarboxylate compounds and said effective amount of the dye solution of Step (b), thereby determining the sulfonate and/or polycarboxylate concentration of the portion of Step (a).

US Patent:

50325264, Jul 16, 1991

Filed:

Jan 11, 1990

Appl. No.:

7/463647

Inventors:

Ronald R. Myers - Coraopolis PA
Jack E. Fink - Darlington PA

Assignee:

Calgon Corporation - Pittsburgh PA

International Classification:

G01N 2178
G01N 3344

US Classification:

436 85

Abstract:

The instant invention is directed to a method for determining the concentration of sulfonate and/or polycarboxylate compounds in an aqueous solution comprising: (a) adjusting the pH of a portion of the aqueous solution to less than 3. 0 when measuring sulfonate concentration or to between 3. 0 and 12. 0 when measuring polycarboxylate concentration; (b) adding an effective amount of an aqueous solution containing a metachromatic dye to the pH-adjusted portion of Step (a); (c) measuring the absorbance of the admixture resulting from Step (b) at a wavelength between 300 nm and 700 nm; and (d) comparing the absorbance from Step (c) with absorbances of standard samples containing known concentrations of sulfonate and/or polycarboxylate compounds and said effective amount of the dye solution of Step (b), thereby determining the sulfonate and/or polycarboxylate concentration of the portion of Step (a).