The catalytic product propylene contains a high level of arsenic; what causes this?

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There are generally two sources of arsenic in catalytic products: one is present in the crude oil used as a catalyst, and the other comes from the additives incorporated into the catalyst, such as the sulfur transfer agents we used in the past. Recently, it has been found that the arsenic content in propylene is relatively high, typically at 80 ul/m3. Catalyst additives have been ruled out as the cause; the main components of the catalytic feedstock are unhydrogenated wax oil, hydrogenated refined wax oil, and residue. I would like to know which component in the catalytic feedstock has a high arsenic content – for example, what is the arsenic content in residue? I also want to ask which crude oils have a higher arsenic content? At present, the nature of our residue oils is Cabinda, Kalun, and Dahuem; the nature of the wax oils is more varied.