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<br /> <br />METHOD OF DETECTION <br />There are four basic methods used to detect cyanide. They are <br />Silver Nitrate Titration, Calorimetric Method, Cyanide Selective <br />Electrode, and Ion Chromatography. All four methods work equally <br />well with Weak Acid Dissociable Cyanides and Total Cyanides because <br />the cyanides in the sample are converted to HCN and are absorbed <br />into a sodium hydroxide solution. The cyanide present in the <br />samples is distilled away from interfering substances. The <br />detection limits for the four methods differ. The Silver Nitrate <br />Titration has the highest detection limit of the four methods, <br />with the detection limit of 1.0 mg/L. For samples containing <br />Less than 1 mg/L, one of the other three methods of detection <br />must be used to quantitate the amount of cyandide present. <br />All four methods show interferences, both positive and negative, <br />for free cyanide determinations, depending upon what other <br />compounds are in solution in the sample. <br />