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In this study copper , nickel , lead , cadmium , arsenic , chromium and vanadium content was measured in the muscles and gills of 24 fishes ( Sarda sarda , Sardinella aurita and Lepidopus caudatus ) caught in the Strait of Messina , by inductively coupled plasma - optical emission spectroscopy with microwave digestion techniques .
 Chemical: copper; Chemical: nickel; Chemical: cadmium; Chemical: arsenic; Chemical: chromium; Chemical: vanadium
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: copper; Chemical: nickel; Chemical: cadmium; Chemical: arsenic; Chemical: chromium; Chemical: vanadium