This is a coated cast iron casserole by Staub that was tested in 2016. It tested negative for lead, arsenic, cadmium and mercury when tested with an XRF instrument. The interior and exterior surfaces were tested. The exterior was positive for chromium (Cr) at 26,200 ppm. For context chromium is part of many stainless steel items.
Here’s a link to this product on Amazon,
please note I have not tested all colors and different colors may contain different levels of various toxicants.