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Originally Posted by nffc
Firstly it'd probably mean compounds.
Sulfur is a common impurity in organic assays - such as extracts from fossil fuels which would then oxidise or add into combustion products- they may use sulfur-containing reagents as part of the synthesis...
Nitrogen is easy, that will come from the air, or again from a reagent or by-product in the synthesis.
Just because the end product doesn't contain N or S then that doesn't mean that either is not used at the plant - and of course when an incident like this occurs, it's the feedstock and everything else that explodes.
And incidentally, S and N oxides are produced in burning of fossil fuels and it's not likely that alkanes - hydrocarbons - used in petrols etc will contain that unless it's an impurity.
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I should have been more precise. I assumed that by "elements of" they meant "containing", that is, as you say, compounds.