“…A new method for small quantities of molybdenum is based on its separation by means of cupferron and chloroform and its colorimetric determination with toluene-3,4-dithiol (128). CHLORINE Berry (14) reports that in the Volhard method for chlorine the excess silver can be titrated in the presence of the silver chloride precipitate with good results if tartrazine is used as the indicator instead of a ferric salt. Vorob'ev (176) points out sources of error in the Berg method which involves fixation of bromine and iodine ions with acetone and determination of the chlorine by the Volhard method.…”