How would the steps of this tracing differ if the urea were recycled?

If urea were recycled, the steps of the tracing process would involve monitoring the input and output of the recycled urea stream. This would require analyzing both the incoming urea feed and the output urea product to ensure that the recycling process is functioning effectively. Additionally, measurements of the concentration of urea in the recycling loop would be necessary to track its flow and potential losses.