System for determining the proportion of at least one impurity in a cryogenic liquid

A determination apparatus for determining the proportion of at least one impurity dissolved in a cryogenic liquid, the at least one impurity being less volatile than the cryogenic liquid, the determination apparatus comprising:

• a vessel configured to receive an initial volume of the cryogenic liquid;
• vaporization means configured to vaporize the initial volume of cryogenic liquid until a volume of residual cryogenic liquid is obtained in which the impurity is concentrated, the vaporization means being disposed in a lower part of the vessel and comprising a heating surface configured to vaporize the cryogenic liquid;
• and
• means for determining the proportion of the impurity in the residual cryogenic liquid,
• wherein the vaporization means comprise at least one cryogenic liquid intake duct and a plurality of cryogenic liquid discharge ducts, the vaporization means being configured to produce a thermosiphon effect between the intake duct and the plurality of discharge ducts, the heating surface comprising internal surfaces of the discharge ducts.