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Cadmium concentration was determined by graphite furnace atomic absorption spectrophotometry in 91 shrimp samples after nitric acid / perchloric acid digestion .
 Chemical: Cadmium; Chemical: graphite; Chemical: nitric acid; Chemical: perchloric acid
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: Cadmium; Chemical: graphite; Chemical: nitric acid; Chemical: perchloric acid