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In this work, an index is established to detect anomalies in trace elements in the soil. This index, which relates the\udtotal concentration of each element with the regional geochemical background value of the element considered, was\uddefined by studying the levels of trace elements from different soils located in SE Spain. In the area, a previous\udscreening of trace elements detected seven zones with anomalies and revealed two conflictive areas: Sierra Gador and\udCabo de Gata. In each zone, a second sampling was undertaken at two different depths (0-20 cm and 20-40 cm). The\udresults indicate that the main anomalies were due to arsenic (As), lead (Pb), and zinc (Zn). In Sierra Gador Pb was the\udelement that registered the highest rate of enrichment with respect to the regional geochemical background, reaching\udvalues up to 270-fold higher in some samples. In this zone, more than 50% of the samples were anomalous in any of\udthe trace elements studied (higher than regional geochemical background). In Cabo de Gata, As concentration was\udhigher than the geochemical background in more than 40% of the samples; meanwhile Pb concentration was higher\udin 50% of the samples.En este trabajo establecemos un ??ndice para detectar anomal??as en el contenido de elementos traza en suelos. Este ??ndice relaciona el contenido total de cada elemento traza con el fondo geoqu??mico regional, definido mediante el estudio de los niveles de elementos traza en diferentes suelos localizados en el sureste espa??ol. En un primer estudio sobre niveles de elementos traza en suelos del ??rea de estudio detectaron siete zonas con anomal??as, de las cuales dos fueron consideradas conflictivas: Sierra de G??dor y Cabo de Gata. En cada una de estas dos zonas se realiz?? un segundo estudio m??s exhaustivo a dos niveles de profundidad (0-20 y 20-40 cm). Los resultados indican que las principales anomal??as correspondes a los niveles de As, Pb y Zn. En Sierra de G??dor el Pb es el elemento que presenta una mayor tasa de enriquecimiento con respecto al fondo geoqu??mico regional, con valores puntuales que lo superan hasta 270 veces. Tambi??n en esta zona m??s del 50% de las muestras presentan anomal??as en alguno de los elementos analizados. En Cabo de Gata el As supera el fondo geoqu??mico regional en m??s del 40% de las muestras; mientras que el Pb lo supera en el 50% de las muestras

A new index to evaluate anomalies of trace elements in soils: the case of SE Spain