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A sentence from a document describing the contents of a pharmaceutical tablet and the prodecure helping to determine whether a tablet has the proper content:

The procedure for assaying ethinyl estradiol and chlormadinone is described in the Assay section.

The procedure for assay of ethinyl estradiol and chlormadinone is described in the Assay section.

Which of the two looks more natural? I've found the "for assay of" combination while googling on the topic.

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    Assay is a verb, especially in chemistry, so I believe the first one is correct. – StorymasterQ Sep 25 '14 at 5:59
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    For the second one, I suppose it should be "for the assay of". For actual usage this might be a good question for Chemistry SE. – user3169 Sep 25 '14 at 6:24
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Both are correct. However since "assay" can be used as both verb (to perform the assay) and noun (the output of the assay) I find the second one more natural. (I am native Australian English speaker, but not a chemist or geologist etc)

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