The method below uses only underivatized HCHO, so you just need to weigh accurately and dissolve your paraformaldehyde in water to prepare your standards.
http://www.phenomenex.com/Application/Detail/21516
This showed up a few weeks ago from Ahmed...
https://www.researchgate.net/post/How_can_I_determine_methanol_and_formaldehyde_concentration_in_water_by_a_GC_FID_and_Rt-U-BOND_Columns_Thanks_in_advance
And, added honestly, cf. to another Question from Ahmed, asked 4th of August 2017:
How to prepare different concentrated formaldehyde solution (e.g 250,500,750,1000 ppm) using para-formaldehyde powder for GC standard calibration.
(= https://www.researchgate.net/post/How_to_prepare_different_concentrated_formaldehyde_solution_eg_250_500_750_1000_ppm_using_para-formaldehyde_powder_for_GC_standard_calibration?_tpcectx=post_detail_recommendations )
To @Ahmed Sakib: I strongly recommend to add the RG-Links to your additional requests/questions as it turns out they (at least 3 questions) might be correlated to each other....
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