求助两个标准：ASTM D7771 和 ASTM D7772

ASTM D7771 - 15 Standard Test Method for Determination of Benzo-α-Pyrene (BaP) Content in Carbon Black
http://www.doc88.com/p-1127698299475.html
http://bbs.angui.org/thread-142465-1-1.html

ASTM D7772 - 15 Standard Test Method for Carbon Black Extractables – Absorbance of Cyclohexane Extract
http://www.doc88.com/p-8826954255393.html
http://bbs.angui.org/thread-142464-1-1.html