Journal
TALANTA
Volume 56, Issue 6, Pages 1163-1165Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-9140(01)00609-9
Keywords
cyanide assay; ninhydrin reagent; 2,2-dihydroxy-1,3-indanedione
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A very simple, accurate, fast, selective and sensitive assay of cyanide based on its reaction with 2,2-dihydroxy-1,3-indanedione at basic pH is proposed. As little as 0.01 mug ml(-1) of cyanide can be determined. The molar absorptivity may reach 5.1-8.0 x 10(4) 1 mol(-1) cm(-1) depending on the reaction conditions. Thus, 1 ml of sample solution is mixed with 500 mul of 5 mg ml(-1) solution of 2,2-dihydroxy-1,3-indanedione monohydrate in 2% sodium carbonate. The absorbance of the purple color is measured at 510 nm in 1-cm glass cuvettes, 10-15 min after mixing the reagents. The procedure could also be used to identify free CN- in natural waters and hydrocyanic acid in the environment. (C) 2002 Elsevier Science B.V. All rights reserved.
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