Canadian requirements for sea containers are set out in the Safe Container Convention Act and Regulations and Compliance. These cover the safety aspects in regards construction and maintenance for containers on international movements. IMO is of particular note for guidance on serious structural deficiencies in containers.
Several publications are available on the web, such as:
Request an inspection for vessels loading, carrying or unloading dangerous goods
Authorized representatives can apply for the inspection of dangerous goods in solid bulk and/or packaged form being loaded, carried or unloaded. This includes ammonium nitrate-based fertilizers and explosives.