6Lake Albufera (Valencia, Spain) is part of a legally protected wetland of international 7 importance. However, it has deteriorated as a result of urban, industrial and farming pollution. 8It is highly eutrophic, and its sediment contains persistent pollutants, such as heavy metals. In 9 anoxic sediments, sulphides represent an important binding phase for heavy metals. In this 10 study, acid volatile sulphide (AVS) and simultaneously extracted metals (SEM) were 11 analysed in surface sediment extracted from Lake Albufera; organic matter and total metals 12 were also analysed. Twelve sites were sampled in each of three sampling campaigns 13
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