A quantitative testing method for the presence of peroxides in organic solvents and ethers exists as well:
Note: The following instructions come from Galade Chemical, a distributor of the above product, and the authors of Water Testing Blog present them ‘as is’, with no expressed or implied guarantees of accuracy.
Immerse a test strip for approximately 1 second in the solvent being tested and allow to evaporate.
Breathe on the reaction zone 4 times for 3-5 seconds each time. Alternatively, immerse briefly in distilled water.
Compare the reaction zone with the color scale.
Low Volatility Ethers
A. Immiscible with water.
Mix a sample of the ether to be tested with 3 times its volume of peroxide-free ether or petroleum benzine (boiling range 40-60°C).
Test as described under “Volatile ethers.”
Record the value indicated on the scale and multiply by 4.
B. Miscible with water
Mix a sample of the ether to be tested with 3 times its volume of distilled water.
Immerse a test strip for approximately 1 second.
Wait 2 minutes and compare with the color scale.
Convert the results as under “Conversion.”
Allowing for dilution, 3mg/l on the color scale is equivalent to:
90mg/l tetrahydrofuran peroxide or 30mg/l peroxide calculated as H2O2
150mg/l dioxan peroxide or 45mg/l peroxide calculated as H2O2.