Photodissociation/gas diffusion/ion chromatography system for determination of total and labile cyanide in waters

Determination of cyanide in wastewaters using modified glassy carbon electrode with immobilized silver hexacyanoferrate nanoparticles on multiwall carbon nanotube

“…A large number of analytical methods have been published concerning the determination of cyanide in water and wastewaters including ion-selective potentiometry [5], indirect atomic absorption spectrometry [6][7][8][9], spectrofluorimetry [10,11], molecular absorption spectrophotometry [12], chromatographic technique [13] and capillary electrophoresis [14]. There are numerous methods for determination of cyanide in the water and wastewater samples [15].…”

A novel spectrophotometric method for determination of cyanide using cobalt (II) phthalocyanine tetracarboxylate as a chromogen

“…While cyanide compounds are widely used in industry, metal plating is responsible for most of the cyanide wastes causing stream pollution [1][2][3][4]. Various instrumental techniques have been suggested for determining cyanides, including the use of potentiometric sensors [5][6][7][8][9][10], chromatography [11,12], spectrofluorimetry [13], indirect atomic absorption spectrometry [14] and spectrophotometry [15][16][17][18][19][20][21][22][23][24][25][26].…”

Determination of cyanide by a pervaporation–UV photodissociation–potentiometric detection approach

“…The most important metal-cyanide complexes involved in environmental issues are those of iron, zinc, nickel, copper, cobalt and cadmium, which differ considerably in toxicity and environmental persistence. Thus, weak and labile complexes such as Zn(CN) 4 22 , Cd(CN) 4 22 and Cu(CN) 4 32 , which can easily release cyanide in acidic media (pH < 4), are more toxic than Ni(CN) 4 22 , Fe(CN) 6 32 , Fe(CN) 6 42 and Co(CN) 6 32 , which require more drastic conditions. Ferrocyanides, which are the well-known hexacyano complexes of iron, are photodissociated to free cyanide upon exposure to sunlight, then the toxicity of these species could be higher than expected based on thermodynamic stability.…”

“…Ferrocyanides, which are the well-known hexacyano complexes of iron, are photodissociated to free cyanide upon exposure to sunlight, then the toxicity of these species could be higher than expected based on thermodynamic stability. 4,5 The sample pre-treatment to obtain free cyanide is perhaps the most important aspect in cyanide analysis. The standard methods for cyanide determination use acid distillation procedures to decompose metal-cyanide complexes and have several drawbacks: very time consuming, labour intensive, consumption of large amounts of samples and reagents and involving a number of serious interferents such as sulfide and thiocyanate.…”