17291
A calibration curve of absorbance ( at 730 nm ) vs . [ PA ] is linear ( r = 0 . 998 ; n = 7 ) from 1 . 0 to 7 . 0 mu molL ( - 1 ) [ PA ] .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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