Indirect tensammetric method for the determination of non-ionic `surfactants: Part 2. Investigation and improvement of tolerance to man-made anionic surfactants

✍ Scribed by Andrzej Szymanski; Zenon Lukaszewski

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 779 KB
• Volume: 273
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80171-g

✦ Synopsis

Non-ions surfactants can be detemuned by means of their lowering effect on the tensammetnc peak of ethyl acetate Representatwe man-made anionic surfactants were mvestlgated m order to check the tolerance to this group dunng the determination of non-ionic surfactants Both the "normal" procedure (recording m the cathodic direction startmg from -1200 V) and "reverse" recording (scanning m the anodlc dIrectIon starting from -1400 V) were used Sodium salts of dodecylbenzene sulphonate (DBS), dodecyl sulphate (DSA), dodecyl sulphonate (DSO) and stearate (S) and the commercial products Kosulfonat 40 (KOS) and Sulforokanol L3 (lauryl ether suiphate) (LES) were investigated The interference of the anionic surfactants increases m the order DSA, DBS < LES < DSO, S < KOS with "normal" recording and in the order DSA, DBS, S < LES, DSO < KOS with "reverse" recordmg The tolerance to anionic surfactants IS substantially better if "reverse" recordmg IS used On the other hand, the signals of non-ionic surfactants havmg l-3 oxyethylene subunits are sbghtly lower m this case The real tolerance to anionic surfactants IS better than expected presuming addltlwty of analytical signals A 2-pg amount of Triton X-100 can be determmed m the presence of 20 and 50 pg of DBS with "normal" and "reverse" recording respectively However, only 2 7 and 7 pg of KOS, respectively, are tolerated under the same conditions