4450
Based on range - specific evaluation , extraction of individual OPs was characterised by sub - ppb level sensitivity and a wide 0 . 01 - 2 . 5 mg L ( - 1 ) dynamic range .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None