A heterogeneous spent soda effluent generated from Tunisian petroleum refineries has been filtrated and separated in four solid fractions with a particle diameter of 160 to 100, 100 to 40, 40 to 16 and 16 to 10 µm and the fifth one with diameters < 10 µm obtained after total evaporation of the remained filtrate. Spectroscopic characterizations of the condensed phases by means of X-ray induced photoelectron and IR absorption, as well as pH-metry, potentiometry and stationary voltammetry at Ag₂S/Ag electrode studies of the filtrate, show that the whole of the separated fractions contain Na₂S, NaHS, C₂H₅SNa, Na₂S₂O₃, Na₂SO₃ and methyl, ethyl and propyl mercaptans.

突尼斯炼油厂产生的非均质废碱废水经过过滤并分离成粒径为 160 至 100、100 至 40、40 至 16 和 16 至 10 µm 的四种固体部分，并获得直径 < 10 µm 的第五种固体部分剩余滤液完全蒸发后。通过 X 射线诱导光电子和红外吸收对凝聚相进行光谱表征，以及对滤液进行 pH 测定、电位测定和 Ag ₂ S/Ag 电极固定伏安法研究，结果表明，整个分离的级分含有Na ₂ S、NaHS、C ₂ H ₅ SNa、Na ₂ S ₂ O ₃、Na ₂ SO ₃和甲基、乙基和丙基硫醇。