Figure 2

Measurement of the CO concentration in the handling preservation chamber.
(A) The measurement location of the CO gas after opening the valve of the chamber. “a”: human working area 30 cm from the chamber. “b”: 10 cm directly above the chamber. (B) CO concentration at point “a” and “b”. i: opening the valve of the chamber after preservation. ii: pressure gauge zero. iii: opening the cover of the chamber to remove the preserved hearts.