DIFFERENTIAL-PULSE POLAROGRAPHIC-DETERMIN ATION OF CYANIDE IN EFFLUENTS OF MANIOC MEAL INDUSTRIES

There are several industries manufacturing Cassava products in Brazil and other tropical countries. Some Cassava, like Manihot esculenta Cra ntz and Manihot utiliss, are largely used for the manioc meal producti on or directly used as an important source of human food. The general problem associated with the manioc meal production is the effluent wit h high level of organic matter and the toxic cyanide. The differential pulse polarographic technique was studied for the determination of cy anide using the buffer solution of tris(hydroxymethyl)aminomethane (TR IS) as supporting electrolyte. This technique is an useful alternative to the classical spectrophotometric methods for cyanide determination in wastewaters.