Dr Horton is an expert in the fate and ecological effects of microplastics in aquatic systems. In 2017 she published the first study identifying microplastics in UK rivers including the River Thames, and has since led experimental studies on the effects of microplastics on aquatic and terrestrial invertebrates, alone and in combination with persistent organic chemicals. She is currently working on industry-funded and EU-funded projects investigating microplastics in wastewater, rivers and the open ocean. In order to understand how and why organisms will come into contact with plastics she is particularly researching how the connections between land, lakes, rivers and the sea lead to the input, transport and accumulation of plastics within the environment.
Alongside her research she leads the UK Microplastics Network, working closely to integrate academic research with industry, policy and business to more efficiently address the variety of issues surrounding microplastics within the environment.