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The storage system below is an example of one method for storing chemicals by compatibility.  Many guides to separation and storage are available through online searching.  No single method is required to be used at the University of Kentucky, however, it is of primary importance to know the properties of all chemicals utilized in the lab. Laboratory staff must familiarize themselves with the Global Harmonization System for categorizing chemicals and the pictograms used. Whichever storage system the laboratory chooses to use for their chemical storage, the following chemical groups are kept separate by using secondary containment, cabinets, or distance:

  • oxidizers, including peroxides;
  • corrosives—inorganic bases;
  • corrosives—inorganic acids, not including oxidizers or combustibles;
  • flammable materials;
  • reproductive toxins; select carcinogens; and substances with a high degree of acute toxicity
Prudent Practices Segregation

Compatible storage group classification system

This system should be used in conjunction with specific storage conditions taken from the manufacturer's label and material safety data sheet. 

Fig. 5.1 Prudent Practices in the Laboratory, Adapted from Stanford University's ChemTracker Storage System. Used with permission from Lawrence M. Gibbs, Stanford University.

TABLE 5.1 Examples of Compatible Storage Groups

A: Compatible Organic Bases

Diethylamine
Piperidine
Triethanolamine
Benzylamine
Benzyltrimethylammonium hydroxide
B: Compatible Pyrophoric & Water-Reactive Materials

Sodium borohydride
Benzoyl chloride
Zinc dust
Alkyl lithium solutions such as methyl lithium in tetrahydrofuran
Methanesulfonyl chloride
Lithium aluminum hydride
C: Compatible Inorganic Bases

Sodium hydroxide
Ammonium hydroxide
Lithium hydroxide
Cesium hydroxide
D: Compatible Organic Acids

Acetic acid
Citric acid
Maleic acid
Propionic acid
Benzoic acid
E: Compatible Oxidizers Including Peroxides

Nitric acid
Perchloric acid
Sodium hypochlorite
Hydrogen peroxide
3-Chloroperoxybenzoic acid
F: Compatible Inorganic Acids not Including Oxidizers or Combustibles

Hydrochloric acid
Sulfuric acid
Phosphoric acid
Hydrogen fluoride solution
J: Poison Compressed Gases

Sulfur dioxide
Hexafluoropropylene
K: Compatible Explosives or Other Highly Unstable Materials

Picric acid dry(<10% H2O)
Nitroguanidine
Tetrazole
Urea nitrate
L: Nonreactive Flammables and Combustibles, Including Solvents

Benzene
Methanol
Toluene
Tetrahydrofuran

 
X: Incompatible with ALL Other Storage Groups

Picric acid moist (10-40% H2O)
Phosphorus
Benzyl azide
Sodium hydrogen sulfide

Table 5.1 Because chemicals in storage are contained, their separation by compatibility groups can be simplified. The color-coded system described here allows for ease of storage.

 

Prudent Practices in the Laboratory: Handling and Management of Chemical Hazards: Updated Version. National Research Council (US) Committee on Prudent Practices in the Laboratory. Washington (DC): National Academies Press (US); 2011. SOURCE: Adapted from Stanford University's Chem Tracker Storage System. Used with permission from Lawrence M. Gibbs, Stanford University.