Before a worker's employment in the laboratory ends, chemicals for which that person was responsible should be discarded or returned to storage. The Biology Safety Committee will oversee inspection of an ex-employee's work space(s) to ensure that all chemicals are either disposed or returned to storage.
Can the chemical be disposed in a landfill or sewer? Appendix C contains a list of common chemicals that can be disposed in a landfill or sewer. If listed, triple-rinse the container and cap with 5% of the container's volume with water. Sewer the rinses with copious amounts of water.
If the chemical is not listed in Appendix C, then treat it as a hazardous used chemical. Triple-rinse the container and cap in a solvent in which the chemical is soluble. These rinses should be 10% of the container’s volume, and must be collected and labeled for "Chemical waste disposal."
Remove or completely deface the chemical label. Submit the barcode number to Carol Jansky so that the chemical can be removed from the inventory system.
Wash the containers after they have been rinsed. They can be saved for future use, or recycled.
Label potentially hazardous used chemicals with a complete list of components, including the solvent, and their concentrations. Concentrations expressed in percentage are preferred. The label should also include the date, and the name of the employee who generated the used chemical for disposal.
Chemicals collected as potentially hazardous used-chemicals should be placed in NSC 130 on appropriate shelving.
Carol Jansky, or another designated member of the biology safety committee will determine whether the material can be safely disposed in a sewer or landfill following the criteria in Appendix C.
If the material is not contained within the sewer/landfill chemical list, and it is unknown whether the hazard level warrants hazardous waste disposal, a hazard determination form is completed (instructions and form are included in Appendix E). If the material is identified as hazardous, a Hazardous Waste Manifest for the University of Minnesota Chemical Safety Day Program is completed. If the material is not hazardous, the material is disposed using an appropriate disposal technique.
Materials collected for the University of Minnesota Chemical Safety Day Program will be stored in NSC 130 until pickup by the University of Minnesota.
The University of Minnesota on a regular basis will pick up collected hazardous chemical waste.