Potentiometric Determination of Mercaptans in Aqueous Alkaline Solutions

Release of hydrogen sulfide and methyl mercaptan from sulfur-containing amino acids

“…Just prior to titration the 1 M NaOH was also made 0.1 M with respect to NH4OH to avoid precipitation of silver oxide (Tamele et al, 1941). The silver ion activity was monitored with the same electrodes as described above.…”

Potentiometric titration behavior of sodium sulfide, methyl mercaptan, dimethyl sulfide, dimethyl disulfide and polysulfides in mixed alkaline solutions and sulfate pulping black liquors

“…Ag2Sn -*• Ag2S 1 + S"-i° (14) Titration curves of sodium sulfide in alkaline solution of white liquor (WL 1-3) and black liquor (BL 1-2), with and without the addition of CH3SNa solution, are shown in Fig- Similarly, Table II shows the accuracy of sulfide determination of known quantities of hydrogen sulfide and methyl mercaptan in alkaline solution with and without i% thiolignin as an additive. On the titration curve, inflection point A is taken for calculation of the actual sulfide present, A to B for bound mercaptan (organic/inorganic polysulfide), B to C for free mercaptan.…”

The First 110 Years of Laboratory Automation: Technologies, Applications, and the Creative Scientist

“…40 The mercaptan automatic titrator for gasoline developed by the Shell Oil Company was an example of the type of device designed specifically to alleviate a skilled labor shortage. In 1941, chemists working at Shell developed a potentiometric titration procedure, 41 and by 1943, the procedure was automated. 38 The entire device was designed for use by an unskilled operator who would load the sample, add a conductive media, press the start button, and read the result directly from the chart recorder.…”