Chemistry: physical processes – Physical processes – Crystallization
Patent
1978-12-14
1980-07-22
Turk, Arnold
Chemistry: physical processes
Physical processes
Crystallization
23230EP, G01N 3324
Patent
active
042137624
ABSTRACT:
A method of determining the amount of chromate ion in drilling and mud filtrates containing lignosulfonates is disclosed. Briefly, the method comprises: (a) treating the filtrate with an effective amount of hydrogen peroxide to destroy any color bodies contributed by the lignosulfonate, and (b) measuring the amount of chromate ion in the filtrate by means of a spectrophotometer.
REFERENCES:
patent: 3077387 (1963-02-01), Boyd
patent: 3407042 (1968-10-01), Slentz
patent: 3528776 (1970-09-01), Hudson
Skoog et al., "Analytical Chemistry - An Introduction", Holt, Rinehart and Winston, Nov. 1965, p. 366.
Rydholm, "Pulping Processes", Interscience Publishers, 1965, pp. 210-213.
Conoco Inc.
Rutherford, Jr. Bayless E.
Turk Arnold
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