No, the OPCW claims in its preliminary report that it was chlorine, because it could not find any evidence of other things, not a shred of it.
But the evidence of chlorine is based on videos from the jihadi groups, and the existence of those two cylinders. How those cylinders came to be there is contentious, whether they were indeed used to release chlorine is also not established. Found the
preliminary report used for those newspaper pieces:
No organophosphorus nerve agents or their degradation products were detected, either in the environmental samples or in plasma samples from the alleged casualties. Various chlorinated organic chemicals were found in samples from Locations 2 and 4, along with residues of
explosive. These results are reported in Annex 3. Work by the team to establish the significance of these results is ongoing.
The FFM team visited Locations 2 and 4, where it observed the presence of an industrial gas cylinder on a top floor patio at Location 2, and the presence of a similar cylinder lying on the bed of a top floor apartment at Location 4. Close to the location of each cylinder there were crater-like openings in the respective reinforced concrete roofs. Work is ongoing to assess the association of these cylinders with the incident,the relative damage to the cylinders and the roofs, and how the cylinders arrived at their respective locations.
Based on the equipment and chemicals observed during the two on-site visits to the warehouse and the facility suspected by the authorities of the Syrian Arab Republic of producing chemical weapons, there was no indication of either facility being involved in the production of chemical warfare agents.
They have circumstantial evidence that some chlorine was around, and that those cylinders had contained chlorine. Given how pervasive that gas is around Syria, that is not enough to conclusive it was used in the alleged attack.
And they have the videos and statements from the jihadis, which also simulated fake symptoms of a "nerve gas attack". That is tainted evidence, if anything can be.
By now there is plenty of evidence to say that staged propaganda was used to create a phony "war crime", which was subsequently used to justify yet another illegal attack on a country. And this attack only did not took on the proportions of a full-scale war (including likely outright invasion and occupation, a la Iraq) because that country happened to have a powerful ally that threated escalating such a war if it was started.
I would like to hope that an invasion would also not happened because the population of the US and its european allies in these imperial wars has become wary of the lies used to sell them, but I still cannot hope that. Iraq's WMD were denounced as a lie and despite that the invasion still happened. The media still managed, about Syria, to peddle the propaganda that its government was being more "bloodthirsty" that, say, the US and its allied govenments had been in Mosul (or earlier in Fallujah and other cities). Duple standards and propaganda still worked after Iraq, still worked to enable the destruction of Libya, and still would have worked here absent an opposing power capable of increasing the cost of a war.