High levels of certain metals in waste can cause it to be classified as hazardous by governmental agencies. Hazardous waste policies require a test for leachable toxic metals if they are present in solid waste at levels above certain thresholds. The ability of metals to move out of the waste by leaching is an important environmental concern. In some cases,
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Do a preliminary evaluation on 100 g of the material. This involves (1) determining if there are insignificant solids or finding the percent solids,
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Determine the appropriate extraction fluid for samples that have more than 0.5 percent dry solids. Place a 5 g sample (having a particle size less than 1 ml) in a 500 ml beaker or Erlenmeyer flask containing 96.5 ml of reagent water. Stir this for 5 minutes on a magnetic stirrer. If the pH of this water is less than 5.0,
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Connect the filtrate collection vessel to the outlet valve and open it. Increase the pressure to 10 psi to force out liquid for 2 minutes,
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Analyze the samples in four volume equivalent portions. Add the metal standard to three of the fractions in different concentrations at a level of 50,
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