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• Mixture that includes any of the above substances <br /> Source: Lab Waste Drain Disposal, Montana State University(accessed February 1, 2016). <br /> Many of these substances will require hazmat pickup. However, for those that can go down the sink, <br /> remember to use the laboratory sinks ONLY, and never a storm drain that goes directly to a water <br /> source without treatment.When flushing chemicals, be sure ALL of one chemical is gone from the sink <br /> before a second chemical is flushed. Run an excess of water after disposing the chemical, even up to <br /> 100 times the original volume of which you disposed. On any given day, only dispose of a few hundred <br /> grams or milliliters, and check with your maintenance staff before disposing larger amounts. <br /> Which chemicals are acceptable for drain disposal? <br /> Those that meet criteria for trash disposal <br /> • Acids and bases with a pH between 5.5 and 10.5 <br /> • Combinations of the cations and anions listed below(unless they are strong acids or mases). <br /> Please note, if you have a compound that is not a pairing of a cation and anion on this list, it is <br /> NOT safe for drain disposal and shouid be disposed with hazmat pickup. <br /> Cations AM <br /> AI3+ HCO3- <br /> NH-4+ HS03- <br /> Ca2+ BrO3- <br /> Cs+ Br- <br /> H+ C032- <br /> u+ 0103- I <br /> Mgz+ Cl- <br /> K+ OH' <br /> Na+ I03 <br /> Sr2+ I- <br /> Sn2T NO3 <br /> Fee-J'Fe3+ NO2- <br /> F,4/Ti4+ pz- I <br /> Zr2+ POa3- <br /> 5042- <br /> 5032- <br /> B033- <br /> B<4072- <br /> OCN- <br /> SCN- <br /> What to do with hazardous materials <br /> Hazardous materials provide a unique problem for high school chemistry teachers, because most of us <br />