| CPC G01N 1/4044 (2013.01) [G01N 33/24 (2013.01)] | 7 Claims |
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1. A soil sample digestion device, comprising:
a base;
a driving mechanism;
a first disk;
a heating mechanism;
a digestion vessel;
a second disk;
a first liquid adding mechanism;
a second liquid adding mechanism; and
a humidity sensor;
wherein the driving mechanism and the first disk are mounted on the base; the heating mechanism and the digestion vessel are mounted on the first disk; the heating mechanism is configured to heat a solution in the digestion vessel; the second disk is mounted on the driving mechanism, and is configured to be driven by the driving mechanism to ascend and descend, or rotate relative to the first disk; and the first liquid adding mechanism and the second liquid adding mechanism are mounted on the second disk, and are configured for liquid addition to the digestion vessel, respectively;
the first disk is provided with a positioning groove, and the digestion vessel is detachably inserted into the positioning groove; and a thermal conductive sleeve is fixedly arranged in the positioning groove, and is configured to protrude outward relative to a notch of the positioning groove;
the second disk is provided with a sealing groove; a sealing plug is provided in the sealing groove; and a peripheral wall of the sealing groove and an outer peripheral surface of the sealing plug have an annular space therebetween, such that when the second disk is driven to move close to the first disk, the sealing plug is inserted into the digestion vessel to seal a mouth of the digestion vessel, and the thermal conductive sleeve and the digestion vessel are inserted into the annular space;
the humidity sensor is mounted to the second disk, and is configured to be inserted into the digestion vessel to acquire a humidity in the digestion vessel; and the humidity sensor and the sealing plug have a gap therebetween in a circumferential direction of the second disk;
the second disk is configured to be driven by the driving mechanism to rotate, or ascend and descend relative to the first disk; a relative position of the sealing plug relative to the digestion vessel is adjusted as required; and the first liquid adding mechanism and the second liquid adding mechanism are configured to cooperate with the driving mechanism to automatically add a liquid to the digestion vessel; and
the soil sample digestion device is adapted to perform steps of:
adding, by the first liquid adding mechanism, hydrofluoric acid to the digestion vessel containing a soil sample; adding, by the second liquid adding mechanism, nitric acid to the digestion vessel; starting the driving mechanism to drive the second disk to descend, such that the humidity sensor is inserted into the digestion vessel, and the gap is formed between the second disk and the first disk to ensure that the mouth of the digestion vessel is in an open state; and heating, by the heating mechanism, the digestion vessel with the mouth in the open state until the humidity in the digestion vessel acquired by the humidity sensor is lower than a threshold value; and
driving, by the driving mechanism, the second disk to ascend, such that the humidity sensor is separated from the digestion vessel; adding, by the second liquid adding mechanism, the nitric acid to the digestion vessel; driving, by the driving mechanism, the second disk to descend, such that the mouth of the digestion vessel is sealed by the sealing plug; heating, by the heating mechanism, the digestion vessel with the mouth in a sealed state; and after the heating is completed, taking out the digestion vessel, and performing detection and analysis on the soil sample in the digestion vessel.
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