Two-volume cryoablation cell apparatus and ablation method thereof for LA-ICP-MS analysis of fluid inclusion

A two-volume cryoablation cell apparatus for LA-ICP-MS analysis of a fluid inclusion, comprising:

• an ablation cell base, having a square metal substrate and a metal abutment disposed on the metal substrate and shaped as a hollow cylinder, wherein the ablation cell base forms a large-volume ablation cell, wherein
• a middle portion of the metal substrate has a first through hole and is provided with a first light-transmitting glass sheet;
• the metal abutment is coincident with the metal substrate on an axis, and has a second through hole arranged along the axis;
• an upper opening of the second through hole is configured to allow a fluid inclusion sample to be placed therethrough, and a lower opening of the second through hole is aligned to the first through hole and configured to guide light transmitted through the first light-transmitting glass sheet;
• a first gas inlet adapter for introducing a helium gas, a first gas outlet adapter for discharging the helium gas, a liquid inlet adapter for introducing liquid nitrogen, a liquid outlet adapter for discharging the liquid nitrogen and a position adjusting knob are disposed on a peripheral wall of the metal abutment;
• a cryogenic component, comprising a cryogenic stage disposed on the axis of the metal abutment and configured to hold the sample, wherein the cryogenic stage has a fluid channel inside and is provided, on an axis thereof, with a third through hole for transmitting light, and the fluid channel has one end connected with the liquid inlet adapter via a liquid inlet pipeline and the other end connected with the liquid outlet adapter via a liquid outlet pipeline;
• a small-volume ablation cell, positioned above the cryogenic stage and in contact with an upper surface of the sample during use, the small-volume ablation cell being of a hollow cylindrical shape with a transparent closed upper portion and an open lower portion, wherein
• the small-volume ablation cell is provided with a second gas inlet adapter on a side wall near a lower portion thereof and a second gas outlet adapter on a side wall near an upper portion thereof, wherein the second gas inlet adapter is connected with the first gas inlet adapter via a hose, and the second gas outlet adapter is connected with the first gas outlet adapter via a hose;
• the small-volume ablation cell is integrally installed on a mobile support which is provided therein with a thread matched with a screwing portion;
• the screwing portion is provided with the position adjusting knob on the peripheral wall of the metal abutment, so as to drive the mobile support and adjust a position of the small-volume ablation cell when the position adjusting knob is rotated;
• and an axis of the screwing portion is aligned with the axis of the cryogenic stage;
• and,
• an ablation cell cover body, which is capable of being buckled on the upper opening of the metal abutment during use, and seals the sample within the metal abutment, wherein a middle portion of the ablation cell cover body has a fourth through hole and is provided with a second light-transmitting glass sheet;
• wherein the first gas inlet adapter and the first gas outlet adapter are arranged along a first direction, the liquid inlet adapter and the liquid outlet adapter are arranged along a second direction, and the first direction and the second direction are perpendicular to each other.