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As a result of this association , Fe3O4 NPs loaded with high concentration of arsenic can enter into organisms and produce locally high concentrations of arsenic , which may lead to some unexpected toxicity to aquatic organisms .
 Chemical: Fe3O4; Chemical: arsenic; Chemical: arsenic
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Fe3O4, arsenic, arsenic 
Answer:
 Chemical: Fe3O4; Chemical: arsenic; Chemical: arsenic