22414
Optimization of the variables affecting extraction by the selected extraction techniques was conducted and recoveries ranged from 70 % to 100 % by USAE and from 70 % to 108 % by USAEME with estimated quantification limits between 0 . 020 and 2 . 6 mu g / kg were achieved .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None