Verified answer

Select either:

Scientific editing of a chemistry text book for xxx publication.

or

Scientific editing of chemistry textbooks for xxx publication.

Use the collocation 'editing for' to describe who you were editing for:

Scientific editing for xxx Journal Publications LTD.

Use the collocation 'editing in' to describe which publication the editing was being carried out for.:

Scientific editing in the xxx Journal..

Scientific editing of chemistry test book for xxx publications;)

Scientific editing of chemistry test book for xxx publications, this sentence is correct & suitable for you!!

scientific editing "of" is better than either of those.

You also need an article ("a" or possibly "the") if you only edited one such book, or a plural (books) if you edited more than one.

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