I'm looking to calculate Black Carbon concentration using MABI (Multi-wavelength Absorption Black Carbon Instrument) at wavelengths 405nm, 465 nm, 525nm, 639 nm, 870 nm, 940 nm and 1050 nm. Since I used Micro glass fiber for PM10 (47 mm), I couldn't find the standard value of the mass absorption coefficient for BC concentration measurement for the micro glass fiber at these respective wavelengths. So, is there any way/method to calculate the mass absorption coefficient for the above-mentioned PM10 filter paper?