28778
The limits of detection were found in the range of 1 . 6 - 3 . 9 micro g L ( - 1 ) , while preconcentration factor for all understudy metal ions were found to be 166 with loading half time ( t 1 / 2 ) less than 10 min .
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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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