K. Geetha et N. Balasubramanian, Determination of cyanide by an indirect spectrophotometric method using formaldehyde and 3-methyl-2-benzothiazolinone hydrazone, ANAL LETTER, 34(14), 2001, pp. 2507-2519
A simple spectrophotometric method to determine cyanide based on the reacti
on between cyanide - formaldehyde-3-methyl-2-benzothiazolinone hydrazone is
proposed. The method is useful for determining cyanide in the concentratio
n range 0-0.2 ppm with a standard deviation of 3.5% for n = 10 at 0.06 ppm
of CN- and the calculated molar absorptivity is 4.3 x 10(4) L mol(-1) cm(-1
). Response of the proposed method for cyanide determination in the presenc
e of potential interferents is evaluated. The method is practically free fr
om the interference of thiocyanate in the presence of high concentration of
nitrite and nitrate. The proposed method has been successfully applied to
determine free and total cyanide in effluent samples and in soil sample tak
en from treated cyanide dump. The results are validated with the barbituric
acid method and by standard addition.