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42 Literature referencesMetrohm is the only company that is able to offer you aproduct range covering the entire spectrum of ion analysis fromjust one source:• ion chromatography• titration (potentiometric, thermometric and Karl Fischer titration)• voltammetric trace analysisMetrohm also offers a variety of other products for the modernanalysis laboratory and for process analysis:• columns for ion chromatography• comprehensive automated solutions• dosing devices and liquid handling systems• pH meters, ion meters and conductometers• sensors for a wide range of different applications• software for instruments, networks and databases• stability measuring instruments• systems for online and atline process analysisInnumerable users from research, industry and the educationsector work with Metrohm products in their everyday routine andappreciate their reliability, accuracy and flexibility. The examplesof scientific work described below demonstrate areas in whichMetrohm instruments can be used and provide at the same timevaluable application know-how. We are pleased to be able to offeryou this literature service. However, we are unable to provide youwith copies of the original work. For one thing, this is impossiblefor copyright reasons. We would ask you to download the articlesdirectly from the publishers' website or to contact your nearestuniversity library, where it will usually be possible to obtain therequired information on reasonable terms.Free and comprehensive application know-how is availableto you from Metrohm in the form of Application Bulletins (AB),Application Notes (AN), technical posters and monographs. Consultour application database on http://products.metrohm.com tofind a solution to your application problem.Literature references on potentiometric titrationU(VI) sorption on kaolinite: effects of pH, U(VI)concentration and oxyanionsLiang Gao, Ziqian Yang, Keliang Shi, Xuefeng Wang, Zhijun Guo andWangsuo WuU(VI) sorption on kaolinite was studied as functions of contacttime, pH, U(VI) concentration, solid-to-liquid ratio (m/V) by using abatch experimental method. The effects of sulfate and phosphate onU(VI) sorption were also investigated. It was found that the sorptionkinetics of U(VI) can be described by a pseudo-second-order model.Potentiometric titrations at variable ionic strengths indicated thatthe titration curves of kaolinite were not sensitive to ionic strength,and that the pH of the zero net proton charge (pH PZNPC) was at 6.9.The sorption of U(VI) on kaolinite increased with pH up to 6.5 andreached a plateau at pH >6.5. The presence of phosphate stronglyincreased U(VI) sorption especially at pH