Synthesis of Sulfonated Naphthalene-Formaldehyde Condensates and their Trace-analytical Determination in Wastewater and River Water     

C. Redín  F. T. Lange  H.-J. Brauch  S. H. Eberle 《洁净——土壤、空气、水》1999,27(3):136-143

Naphthalenesulfonates and their condensates with formaldehyde (SNFC) are widely used in industrial processes, e.g. as plasticizers for concrete or as tanning agents. Based on their high aqueous solubility these compounds are expected to be eliminated incompletely in mechanical-biological treatment plants and to end up in the aquatic environment. Due to the lack of reference compounds the identification and quantification of these condensates in the aquatic environment was impossible in the past. This paper describes the synthesis of several condensates of 2-naphthalenesulfonate with formaldehyde. With the synthesized products as reference compounds it was possible for the first time to detect and quantify some sulfonated naphthalene-formaldehyde condensates in the aquatic environment. For this purpose characteristic peaks in the HPLC screening of wastewater and river water samples were compared with the corresponding peaks of a technical SNFC product. Three out of several paths on which these compounds enter the aquatic environment were identified. The identified compounds in the analyzed wastewater samples have concentrations between 0.14 and 110 μg/L.  相似文献   

Untersuchung der Anwendungsmöglichkeiten von einigen komplexbildenden Ionenaustauschern zur Kupferabtrennung aus natürlichen Wässern und Abwässern     

O. N. Kononowa  N. W. Fjodorowa  A. G. Cholmogorow  S. W. Katschin 《洁净——土壤、空气、水》2000,28(2):102-106

Application of Some Complexing Ion Exchangers for Copper Recovery from Natural Water and Wastewater The rational use of water resources is one of the urgent environmental control problems. These problems can be solved by the treatment of sewage. Removal of different non‐ferrous heavy metal ions from wastewater is of great importance. Besides, the selective complexing ion exchangers are of interest because of their good sorption properties. The present paper is devoted to the study of some complexing resins for copper recovery from natural water and sewage. The following carboxylic resins were studied: the cation exchangers KB‐2T, KB‐4 and the amphoteric ion exchangers ANKB 35, AMF‐2T, and AMF‐2S (manufacturer – “TOKEM” company, Kemerovo, Russia). The exchangers investigated differed from each other both by their functional groups and by their matrix physical structures. The copper recovery from CuCl₂‐, CuSO₄‐, and Cu(NO₃)₂‐solutions was studied in batch‐experiments (in presence of NaCl, Na₂SO₄, and NaNO₃). The initial copper concentration in the solutions was 0.0002...0.008 mol/L; pH values were 1.0...5.0. After equilibrium (24 h) the resins were separated from the solution. The copper concentration in the solutions after the sorption was determined by the photometrical method with pyridylazoresorcin (λ = 500 nm). On the basis of the experimental data distribution ratio, the separation factors, equilibrium constants, and stability constants of copper complexes in the exchanger phase were calculated. It was found out in this work that the amphoteric ion exchanger AMF‐2T of macroreticular structure is the most effective for the copper sorption from sewage.  相似文献