The presence of strontium or barium together with chromium determined with an XRF instrument may indicate the presence of anticorrosive paints based on hexavalent chromium but it has not been examined whether similar results would be obtained if the elements are present as alloying elements in steel

What is the correctly punctuated version of this sentence?
The presence of strontium or barium together with chromium, determined with an XRF instrument, may indicate the presence of anticorrosive paints based on hexavalent chromium, but it has not been examined whether similar results would be obtained if the elements are present as alloying elements in steel.