Moluscos del Parque Nacional de Aigüestortes

Es van recol·lectar molluscs al Parc Nacional d'Aigüestortes i els seus voltants, principalment entre 1.600 i 2.500 m d'alçada, durant els estius de 1958 i 1959. Es van recollir un total de 51 espècies (34 dins dels límits del Parc). Aquesta diversitat relativament baixa sembla estar causada per l'alçada i els substrats majoritàriament silicis.Molluscs were sampled in and around Aigüestortes National Park (Central Pirenees) mostly at altitudes comprised between 1.600 and 2.500 m., in summer of 1958 and 1959. A total of 51 species were found (34 within the Park's limits). This relatively low diversity appears to be caused by altitude and the mostly siliceous substrates.Se recolectaron moluscos en el Parque Nacional de Aigüestortes (Pirineo Central) y sus alrededores, principalmente entre 1.600 y 2.500 m., de altitud, en los veranos de 1958 y 1959. Se halló un total de 51 especies (34 dentro de los límites del parque). Esta diversidad relativamente baja parece causada por la altitud y los sustratos mayoritariamente silíceos

Determinació de bromur d’etiltrifenilfosfoni i de clorur de butiltrifenilfosfoni en resines de polièster saturat per LC-MS

Treballs Finals de Grau de Química, Facultat de Química, Universitat de Barcelona, Any: 2021, Tutores: Anna Rigol Parera, Immaculada Peña UseroPowder Coatings are a type of paintings fully applied in the form of dry powder. Thermosseting Polyester Powder Coatings, one of the most used in industry, are based in a saturated polyester resin (with –COOH or –OH functionality group) as binder and crosslinker. In certain cases small amount of catalyst is added in order to the resin to try to achieve an acceptable curing time in baking temperatures. In Arkema Química S.A.U. (Sant Celoni) two specific types of catalyst, TRAP and BTPC (phosphonium salts), are added to the polyester that they synthesizes. The R&D laboratory of the industry requires the analysis of these two catalysts in the resins. The present work aims at developing a method that allows an estimation of the proportion of TRAP and BTPC present in the resins. Several tests have been performed to find the optimal working conditions to analyze the target catalysts by LC-MS. The chromatographic parameters have been optimized, finding the proportions of the appropriate eluents in a gradient method and the best parameters for mass detection using ES ion source. Two blank injections between every single sample analysis were determined as the best way to prevent the carry-over effect of TRAP. The extraction conditions of the catalysts in the resin have also been optimized, obtaining an approximate recovery of 90% for different sets of resin containing TRAP. This study is the basis for future validation of the quantitative metho