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© 2020 Asociacion Espanola de Estudio en Drogodependencias. All rights reserved. Wastewater-Based Epidemiology is currently a reliable and complementary tool to methodologies based on traditional indicators for the control of various substances such as drugs. Although several European countries use it as a working tool for the monitoring of drugs of abuse, in Spain its use is mainly limited to studies carried out by different research groups, as described in the case study used as an example in the article. However, the potential of the methodology has been demonstrated in the scientific studies carried out both at the Spanish and international level and, although more studies are necessary to get to know its full potential, it is expected that it could be incorporated as a complementary work tool to those that are usually used. In this sense, the Red Española de Análisis de Aguas Residuales (ESAR-Net), created in 2017 and formed by different Spanish research groups, aims to contribute to the knowledge and application of this methodology in Spain through scientific and outreach activities.

The incorporation of rare earth ions into KTiOPO4 crystals and into other isomorphous phases is more efficient for impurities of small ionic radius. Some of the Nd3+ and Er3+ spectroscopic properties in KTiOPO4 (KTP) and RbTiOPO4 (RTP) are discussed to illustrate the contribution of several centres to the optical absorption and photoluminescence properties. The Nd3+ centres observed in KTiOPO4 crystals grown in a W-rich flux have larger optical absorption cross sections than those observed in KTP crystals grown in a self-flux.