An assay procedure to compare sorptive capacities of activated carbon dressings: the detection of impregnation with silver

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Abstract
A semiquantitative assay procedure for the estimation of uptake of diethylamine by activated carbon dressings has been developed. The procedure involves the use of Nessler’s reagent as a comparative indicator. The use of diethylamine allows the concomitant detection of silver with which the dressings may be impregnated. The implications of silver/amine complex formation during dressing use are discussed. Quantification of the silver content of one such fabric was carried out by atomic absorption spectrophotometry. A silver content of 2770 ppm was found. It is suggested that this method might be suitable for adoption as the basis for a pharmacopoeial assay procedure for activated carbon dressings.