dear Elisa
firstly, if you have not already, you may refer to
https://pubs.acs.org/doi/10.1021/acs.oprd.3c00153
https://pubs.acs.org/doi/10.1021/acs.oprd.0c00224
A section “Can the N-nitrosamine be formed?” is available in https://www.efpia.eu/media/tkbnsicy/efpia-nitrosamines-risk-management-workflows-jun-24-udpate.pdf
also previous discussion is also available Nitrosamines in solution at pH 7
however, from the regulatory point of view, confirmatory testing is usually expected in the presence of secondary amines and any nitrosating agent.