Solvent extraction behaviour of thiocyanic acid.
The solvent extraction behaviour of thiocyanic acid with isobutyl methyl ketone and xylene as solvents is described. In the ketone system the thiocyanic acid is solvated in the organic phase to give a complex with a proposed composition of HSCN. 2IBMK. Deviations from ideal behaviour, which can be attributed to variations in the activity coefficient of the acid in the aqueous phase, are shown.
The separation of platinum and palladium by selective extraction of H(2)Pt(SCN)(6) and H(2)Pd(SCN)(4) using a polyTHF-impregnated filter.
Platinum and palladium are known to form complexes with the thiocyanate ion in solution. The isolation and separation of both platinum and palladium as thiocyanate complexes is demonstrated by passing them through an organic-impregnated filter (OIF) prepared with polyTHF. Simultaneous extraction is performed by converting both metals into the extractable form. Sequential extraction is achieved by exploiting the difference in the rates of formation for the extractable complexes of the two metals. The extraction of both metals is rapid with quantitative recoveries of platinum with flow rates as high as 600 ml min(-1) in small samples, while recoveries from larger volume samples were considerably lower. Once extracted, the metals can be removed from the OIF by conversion to a non-extractable form with a high pH eluting solution. The rapid separation, isolation and preconcentration of both platinum and palladium from aqueous samples is demonstrated.
The Open Mobile Alliance: Delivering Service Enablers for Next-Generation Applications
Apractical overview of OMA specifications and how they enable mobile multimedia services & much more ! The Open Mobile Alliance (OMA) is an industry forum, which develops open specifications to help in the creation of applications and services to be deployed over converged networks. The alliance is the leading industry forum for generating market-driven specifications for interoperable mobile service enablers that facilitate global user adoptions of mobile multimedia services. Members include traditional wireless industry segments, such as mobile operators mobile operators (e.g. AT&T, China Mobile, Orange, Sprint Nextel, T-Mobile, Telefonica, Vodafone), equipment and mobile systems manufacturers (e.g. Alcatel-Lucent, Ericsson, Motorola, Nokia, Philips, Samsung, Siemens, Sony-Ericsson), and Information Technology vendors (e.g. BEA Systems, IBM, Microsoft, Oracle Corporation, Sun Microsystems and NEC). Since its formation in 2002, the OMA has made significant progress in areas such as push-to-talk over cellular, device management, presence and group management, and messaging. The Open Mobile Alliance: Provides a comprehensive overview of the service enablers published by the OMA, tying together all the different piece parts developed by the individual working groups Offers a thorough introduction to the OMA Service Environments (OSE) and the specification process for enabling technologies. Discusses enablers for services such as gaming, IMS, Parlay, mobile broadcast and web services. Contains contributions from all stakeholders in the mobile application value chain. The Open Mobile Alliance Alliance is an invaluable resource for OMA members, product managers, network architects and planners, standards managers, standards engineers and IT professionals. Advanced Students and lecturers on mobile application development and standardization courses will also find this book of interest."The success of OMA is due to its individual members' contributions, and this book is testament to their hard work. The individual members' efforts and the authors of this book are to be congratulated on their magnificent achievements." Mark Cataldo, Senior Advisor, Orange SA, OMA Technical Plenary Chairman