warg

30 Waste and Recycling wet chemistry techniques. Newer generations of automated equipment can also result in waste reduction over older, less efficient models. Ethidium Bromide Several less mutagenic ethidium bromide substitutes are available. SYBR-Safe is the only substitute approved by the City of Ames for disposal down the sanitary sewer. Contact EH&S for more information regarding this product. Glassware Cleaning Solutions Chromic acid should not be used to clean campus glassware. Users should select one of the following alternatives, listed in order of increasing hazard. • Non-hazardous cleaning solutions (may be disposed of down the drain) ¤ Ultrasonic baths ¤ Alconox or similar detergents ¤ Pierce RBS-35 or similar detergents ¤ Biodegradable surfactants • Strong corrosive solution (waste must be collected by EH&S) ¤ Potassium hydroxide/ethanol solutions ¤ Dilute hydrochloric acid • Strong oxidizing acid solutions- no chromium (waste must be collected by EH&S) ¤ Potassium persulfate/sulfuric acid (No-Chromix) ¤ Aqua regia (mixture of hydrochloric and nitric acids) Latex versus Petroleum-based Paint Products Latex (water-based) paint should be used in place of oil- based paint whenever possible. Consider disposal costs when purchasing paints and buy only what you need. If you have extra, use it or give it to someone who can use it. Use naphtha or mineral spirits for paint clean-up instead of Xylol or Toluol. Avoid using chlorinated paint strippers. Use heat guns, bio- strippers, or mechanical methods to remove old paint. Contact EH&S to check for lead prior to conducting any paint removal project.