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Hrr<.- ~'-'-~. 5~ TH~J 1~31c <br />METHOD OP DETECTION <br />F' - © 4 <br />There are four basic methods used to detect cyanide. T ey are <br />Silver Nitrate Titration, Colorimetric Method, Cyanide elective <br />Electrode, and Ion Chromatography. All four methods wo k equally <br />well with Weak Acid Dissociable Cyanides and Total Cyan dea because <br />the cyanides in the sample are converted to HCN and are absorbed <br />into a sodium hydroxide solution. The cyanide present 'n the <br />samples is distilled away from interfering substances. The <br />detection limits for the four methods differ. The Silv r Nitrate <br />Titration has the highest detection limit of the four m thuds, <br />with the detection limit of 1.0 mg/L. For samples cunt fining <br />less Chan 1 mg(L, one of the other three methods of det ction <br />must be used to quantitate the amount of cyandide press t. <br />All four methods show interferences, both positive and egative, <br />for free cyanide determinations, depending upon what of er <br />compounds are in solution in the sample. <br />