28779
The procedure was applied for the enrichment - separation of analyte ions in environmental samples with recoveries higher than 94 . 8 % and relative SD < 4 . 9 % ( N = 5 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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