20032
To evaluate the vegetative periodic effect of rhizosphere on the patterns of metal bioaccumulation , the concentrations of Mg , K , Ca , Mn , Zn , Fe , Cu , Cr , Ni , Cd and Pb in the corresponding rhizosphere soil and tissues of Phragmites australis growing in the Sun Island wetland ( Harbin , China ) were compared .
 Chemical: Mg; Chemical: K; Chemical: Ca; Chemical: Mn; Chemical: Zn; Chemical: Fe; Chemical: Cu; Chemical: Cr; Chemical: Ni; Chemical: Cd; Chemical: Pb
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Mg; Chemical: K; Chemical: Ca; Chemical: Mn; Chemical: Zn; Chemical: Fe; Chemical: Cu; Chemical: Cr; Chemical: Ni; Chemical: Cd; Chemical: Pb