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Recent recommendations for control of nickel carbonyl exposures have been considered in the design of a simple, sensitive field method for sampling nickel carbonyl in air and process gases. The method involves collection in dilute aqueous HCI, pH adjustment, nickel complex development with alpha-furildioxime, and extraction with chloroform. Color intensity is compared visually (or for greater accuracy, spectrophotometrically) with liquid standards. Sensitivities on the order of 0.001 ppm are obtainable. A detailed development of the thermodynamics associated with the formation of nickel carbonyl is also presented to show the maximum concentrations of nickel carbonyl that may be formed over a wide range of CO concentrations, temperatures and pressures.
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Brief et al. (1965) studied this question.
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