G - Physics – 01 – N
Patent
G - Physics
01
N
150/26, 73/55
G01N 33/18 (2006.01) G01N 21/59 (2006.01) G01N 31/22 (2006.01)
Patent
CA 1234038
"METHOD FOR THE COLORIMETRIC DETERMINATION OF POLYCARBOXYLATES AND SULFONATES IN AQUEOUS SYSTEMS" Abstract of the Disclosure 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); Abstract (Continued): (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).
465058
Fink Jack E.
Myers Ronald R.
Calgon Corporation
Goudreau Gage Dubuc
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