Van den Berge L P, Devreese A, Vanhoorne M
Am Ind Hyg Assoc J. 1985 Nov;46(11):693-5. doi: 10.1080/15298668591395553.
A convenient method for the determination of hydrogen sulfide in air has been developed in which the gas is first collected by aspirating a measured volume of air through a solution of diluted sodium hydroxide and ethanol and subsequently analyzed spectrophotometrically.