4452
Compared to conventional methods currently used , the SPME treatment developed here is quick , accurate , and relatively environmental friendly ; it represents an attractive , practical way to deliver international standards in OP screening routines .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None