6237
In this study accumulation of eight heavy metals ( Cu , Ni , Zn , Cr , Fe , Mn , Co and Pb ) in green vegetables like Allium cepa , Allium sativum , Solanum lycopersicum and Solanum melongena , irrigated with wastewater in Mardan are studied using Atomic Absorption spectrophotometer .
 Chemical: Cu; Chemical: Ni; Chemical: Zn; Chemical: Cr; Chemical: Fe; Chemical: Mn; Chemical: Co; 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: Cu; Chemical: Ni; Chemical: Zn; Chemical: Cr; Chemical: Fe; Chemical: Mn; Chemical: Co; Chemical: Pb