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An automated colorimetric method for the determination of cyanoguanidine in water

An automated segmented flow analytical procedure for the determination of cyanoguanidine (dicyandiamide or DCD) in surface and ground water was developed. DCD reacts with 1-naphthol and diacetyl to form a red-coloured complex which was measured spectrophotometrically at 540 nm. Interferences of a number of ions were evaluated and the results given. Ethylene diamine tetra-acetic acid (EDTA) was used to eliminate the interference of calcium and magnesium. The method was evaluated in the range 0,1 to 30 mg/ DCD-N. At a sample frequency of 30 samples/h a good precision and accuracy were achieved and the carry-over between samples was less than 2%