Mercury calibration source slow-release device
A slow-release device and slow-release membrane technology, applied in the field of mercury standard source slow-release devices, can solve the problems of mercury leakage, difficult control of mercury volatilization and penetration, and difficulty in controlling mercury release and concentration, so as to achieve stable concentration and release The effect of rate stabilization
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Embodiment 1
[0028] This example provides a mercury standard source slow-release device, which includes a micro-quartz test tube containing liquid mercury and a quartz slow-release membrane sealed at the mouth of the test tube. Before use, the quartz slow-release membrane is covered with a sealed cork to prevent the release of mercury. The test tube adopts a micro-quartz test tube, and the sustained-release membrane adopts the above-mentioned quartz sustained-release membrane, which is inert to mercury, and the pore size is selected according to the release requirement of mercury. The sealing plug is made of mercury-inert, dense modified silica gel, PTFE soft rubber and other polymers, which will not degrade in the range of -20-100 °C.
[0029] The volume of the micro-quartz test tube is 1ml, the inner diameter is 6mm, the diameter of the quartz slow-release membrane is 6mm, the thickness is 1mm, the aperture range of the quartz slow-release membrane is 10-200μm, and the amount of liquid m...
Embodiment 2
[0034] Such as figure 1 , figure 2 As shown, on the structure of the mercury standard source slow-release device in embodiment 1, the mouth of the micro-quartz test tube 1 is also covered with a secondary slow-release structure, which is placed on the upper part of the quartz slow-release membrane 2, and the slow-release structure is Eight strips of sealing rubber strips 4 are pasted on the surface of the quartz slow-release membrane 2 , and the sealing rubber strips 4 are pasted on the upper surface of the quartz slow-release membrane 2 . A sealing cork is also added to the mouth of the micro-quartz test tube 1, and the sealing cork is covered outside the quartz slow-release film and the rubber strip to prevent mercury leakage before use. The sealing rubber strip 4 is made of polymers such as inert to mercury and dense modified silica gel, PTFE soft rubber, etc., which will not degrade in the range of -20-100°C. According to the situation, select the number of strips to b...
Embodiment 3
[0041] Such as Figure 4 , Figure 5 As shown, on the basis of the mercury standard source slow-release device in Example 1, the mouth of the micro-quartz test tube 1 is additionally covered with a secondary slow-release structure, which is gap-packed on the upper part of the quartz slow-release membrane 2. The release structure is a capillary group 5 formed by a plurality of capillaries arranged in parallel, the lower opening of each capillary communicates with the slow membrane 2, and the upper opening of each capillary is closed. The capillary group 5 is sealed except that the capillary is connected with the quartz slow-release membrane, and the other parts are sealed. Generally, the structure of the capillary group fired on the quartz plate is adopted. Specific as figure 2 shown.
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