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<br />~, ANALYTICAL -GENERAL <br />I <br />- Buffered Picric Acid Reagent <br />- Mill Picric Acid Recipes <br />- Standard Preparation (Using NaCN) <br />- Alternate Sample Hearing Using a Microwave <br />- Colorimeter Calibration <br />- Colrimeter Standardization and Sample Reading <br />- Effluent Monitoring -Standard Operator Method <br />- Feed Monitoring Using Silver Nitrate Titrations <br />- Feed Monitoring Using Picric Acid -Standard Operator Method <br />- Base Metals by AA <br />For the most acctuate results, add only a portion of the distilled water called for <br />in preparing the standards and unknowns. After the colour has been developed, add the <br />contents to a 100 mL volumetric flask and wash out the conical flask wit~t distilled water <br />and add it to the volumetric flask until the mark has been reached. Always measure <br />absorbance against the respective reagent blank. Plot the absorbance readings vs. µg CN" <br />added in the aliquots of the standard cyanide solution, to construct the calibration graph. <br />The plot should be a smooth curve. <br />,~"~.~.~.n~ 9 <br />