Chemistry: physical processes – Physical processes – Crystallization
Patent
1977-11-28
1979-11-13
Scovronek, Joseph
Chemistry: physical processes
Physical processes
Crystallization
23232R, 422 56, 422 58, 422 61, 422 68, G01N 3122
Patent
active
041742028
ABSTRACT:
A method for quickly determining whether or not the H.sub.2 S concentration in fluids exceeds a preselected level, such as that set by government standards for oil field fluids, comprises: (1) admixing a preselected quantity of a liquid to be tested with a quantity of metal ion (such as Cd.sup.++) capable of reacting with sulfide ion to form a precipitate, the quantity of metal ion being equal to that required to precipitate a preselected amount of sulfide ion; (2) purging any residual H.sub.2 S from the liquid (such as by generating CO.sub.2 in situ); (3) contacting a reagent colorimetrically and selectively responsive to the presence of H.sub.2 S (such as lead acetate) with gas purged from the liquid; and (4) observing the color of colorimetrically responsive reagent.
A kit convenient for use in carrying out the method in the field comprises: a capped bottle containing a premeasured quantity of a reagent reactable with hydrogen sulfide to form a precipitate; a second cap for the bottle, the second cap having mounted on at least a portion of its inner face a water-absorbent paper or fabric which serves as the substrate for the colorimetrically responsive reagent; an effervescent alkali metal bicarbonate tablet which is chargeable to the bottle; a second bottle containing the colorimetrically reactive reagent, said reagent bottle being normally closed, and means for transferring a portion of the colorimetrically responsive reagent to the water-absorbent substrate on the second cap.
REFERENCES:
patent: 2864725 (1958-12-01), Sorg et al.
patent: 3528775 (1970-09-01), O'Hara et al.
Aloe Scientific Catalog 103, pp. 157, 1010, 1048.
Hach Catalog 11A, p. 27.
Korfhage Glenn H.
Scovronek Joseph
The Dow Chemical Company
Turk Arnold
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