Determination of chromate ion in drilling mud filtrates

Chemistry: physical processes – Physical processes – Crystallization

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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.

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