741
Three different species of nonliving red algal biomass Laurancia obtusa , Geldiella acerosa and Hypnea sp . were used to build three types of fixed - bed column for the removal of toxic heavy metal ions such as Cu ( 2 + ) , Zn ( 2 + ) , Mn ( 2 + ) and Ni ( 2 + ) from industrial effluent .
 Chemical: Cu ( 2 + ); Chemical: Zn ( 2 + ); Chemical: Mn ( 2 + ); Chemical: Ni ( 2 + )
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: Cu ( 2 + ), Zn ( 2 + ), Mn ( 2 + ), Ni ( 2 + ) 
Answer:
 Chemical: Cu ( 2 + ); Chemical: Zn ( 2 + ); Chemical: Mn ( 2 + ); Chemical: Ni ( 2 + )