Mercury calibration source slow-release device
A slow-release device and slow-release film technology, which is applied in the field of mercury standard source slow-release devices, can solve problems such as mercury leakage, and achieve the effects of stable release rate and stable concentration
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Embodiment 1
[0030] 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.
[0031] 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
[0035] 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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