How to calculate PAH diagnostic ratios?

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Question about calculation for Standards GC-MS?

I have 4 substances for PAH, each one is 100ppm or 1000ppm, i would like to make a mix(4-PAH) of them of final volume 1mL and final concentration 100μg/kg. How can i proceed? Thank you in advance,

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Virendra Kumar Saxena

Please Ref:

Ravindra and others 2008a .

Yunker and others 2002

Valerio Paolini

I agree with Dr Saxena. Another useful and more recent review of PAH diagnostic ratio is Cecinato et al 2014.

DOI: 10.1016/j.uclim.2014.04.004

The direct link on RG is: https://www.researchgate.net/publication/262074513_Use_of_the_PAH_fingerprints_for_identifying_pollution_sources

Aniket Desai

Thank you! Virendra Kumar Saxena and Valerio Paolini for your prompt answers.