Seizure-inducing methyl bromide and carcinogenic formaldehyde are only some of the poisonous gases scientists found inside cargo containers.
For their study, Hinz and her colleagues enlisted the help of the New Zealand customs authority. Staff used probes, which they pushed through the rubber seals of the container doors, to collect gas samples from 490 sealed containers. Hinz also gathered air samples from dozens of other containers herself, tracking how the concentrations of compounds changed in real time as the containers were opened and the air inside allowed to mix with fresh outside air.
In their study, Hinz and her colleagues found that some of the measured concentrations appeared high enough to cause an acute reaction that triggers immediate symptoms. However, Hinz says that, in practice, it’s unusual for a worker to come into direct contact with toxic gases at such elevated levels. Instead, there is a more common but still notable risk from repeat exposure to low concentrations.
A few years ago, Johanson and his colleagues were called to examine a suspect container in Sweden. It was loaded with rice, but inside the container was also a strange blue bag filled with white powder. When Johanson analyzed the air, he found phosphine, a fumigant,To protect dockworkers, Johanson and his colleagues have designed a device that connects to an extraction fan and attaches to the existing—but tiny—ventilation holes on the sides of most containers.
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