Tests for the Presence of Peroxides

Testing Requirements of Peroxidizable Compounds Tests for the Presence of Peroxides Characteristics of Chemical-Resistant Materials Selection of Protective Laboratory Garments Protective Clothing Levels Selection of Laboratory Gloves Selection of Respirator Cartridges and Filters Effects of Electrical Current on the Human Body Electrical Requirements of Common Laboratory Devices... 

Many common laboratory chemicals form peroxides on exposure to air. They should be tested for the presence of peroxides before being distilled or used as solvents. The recommended retention times begin with the date of synthesis or of opening the original container (Table 17-3). 

Peroxide hazard on concentration Do not distill or evaporate without first testing for the presence of peroxides Discard or test for peroxides after 6 months... 

For cleavages involving iPrOH/dioxane (up to 1 1), the latter should first be tested for the presence of peroxides by mixing it with an equal volume of 4% KI soln. If any brown color is formed after 1 min, remove the peroxides by passing the dioxane through a column of activated alumina (AI2O3). Not all commercially available activated alumina is effective Baker No. 0537 is satisfactory. Do not use acid-washed alumina. The same procedure is used to purify THF.td... 

Peroxide hazard on concentration do not distill or evaporate without first testing for the presence of peroxides. Date containers when opened and discard or test for peroxides 6 months after opening. On small fires, use dry chemical powder (such as Purple-K-Powder), alcohol-resistant foam, water spray, or COj extinguishers. 

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