Speciation analysis and characterisation of arsenic in lavers collected from coastal waters of Fujian, south-eastern China

► The characterisation of arsenic in laver (Porphyra haitanensis) was reported for the first time. ► Five different arsenical species were detected in laver. ► DMAsSugarMethoxy was found to be the predominant species of arsenic in laver. ► The speciation of arsenic in seaweeds is dependent on the seaweed's species.