Systems and methods for sampling
A system includes a capillary having a first end connected to a sampling device and a second end. The sampling device is configured to separate a sample with a separation solution and deliver the sample and the separation solution to the second end. The second end is coupled to a capillary ground contact. A transport liquid supply system in fluidic communication with a transport liquid supply conduit provides a transport liquid from a transport liquid source through the transport liquid supply conduit. The transport liquid provided from the transport liquid supply conduit includes a receiving volume defined at least in part by a meniscus. The second end of the capillary is in fluidic communication with the receiving volume. A liquid exhaust system in fluidic communication with a removal conduit removes liquid from the receiving volume. An analysis system is in fluidic communication with the removal conduit.
1 . A system comprising:
a capillary having a first end connected to a sampling device and a second end, wherein the sampling device is configured to separate a sample with a separation solution and deliver the sample and the separation solution to the second end, wherein the second end is coupled to a capillary ground contact;
a transport liquid supply system in fluidic communication with a transport liquid supply conduit that provides a transport liquid from a transport liquid source through the transport liquid supply conduit, wherein the transport liquid provided from the transport liquid supply conduit comprises a receiving volume defined at least in part by a meniscus, and wherein the second end of the capillary is in fluidic communication with the receiving volume;
a liquid exhaust system in fluidic communication with a removal conduit that removes liquid from the receiving volume;
an electrical conductor for connecting the transport liquid supply conduit to the removal conduit;
a first electrical contact connected to the transport liquid supply conduit; and
an analysis system in fluidic communication with the removal conduit.
2 . The system of claim 1 , wherein the second end of the capillary is disposed within the meniscus and wherein the capillary ground contact comprises at least in part the receiving volume.
3 . The system of claim 1 , wherein the second end of the capillary is disposed in the removal conduit and wherein the capillary ground contact comprises at least in part the receiving volume.
4 . The system of claim 1 , wherein a perimeter of the second end of the capillary is spaced apart from the removal conduit.
5 . The system of claim 1 , further comprising an interface coupled to the transport liquid supply conduit and the second end of the capillary, wherein the interface defines the receiving volume proximate the removal conduit.
6 . The system of claim 1 , wherein the second end of the capillary further comprises a conductive tip and wherein the capillary ground contact is connected to the conductive tip.
7 . The system of claim 5 , wherein the interface comprises at least one flexible element and optionally wherein the flexible element comprises at least one of rubber, polyurethane, neoprene, and silicone.
8 . The system of claim 1 , wherein the sampling device performs capillary electrophoresis or liquid chromatography.
9 . The system of claim 1 , wherein the analysis system is a mass spectrometer.
10 . The system of claim 6 , wherein the tip is disposed remote from and above the meniscus.
11 . A method for analyzing a sample, the method comprising:
receiving the sample and a separation solution from a capillary, wherein the capillary has a first end connected to a sampling device and a second end coupled to a capillary ground contact, wherein the sampling device is configured to separate the sample from the separation solution, wherein the sample and the separation solution is received from the second end and into a receiving volume defined at least in part by a transport liquid delivered from a transport liquid supply conduit;
aspirating the received sample and the separation solution into a liquid exhaust system in fluidic communication with a removal conduit in fluidic communication with the receiving volume;
electrically connecting the transport liquid supply conduit to the removal conduit with an electrical conductor; and
analyzing the received sample and separation solution with a mass analysis system.
12 . The method of claim 11 , the method further comprising supplying the transport liquid to the transport liquid supply conduit from a transport liquid supply system in fluidic communication with the transport liquid supply conduit.
13 . The method of claim 11 , wherein the receiving volume is defined at least in part by a meniscus.
14 . The method of claim 11 , the method further comprising receiving the second end of the capillary within the meniscus.
15 . The method of claim 11 , wherein a perimeter of the second end of the capillary is in contact with the removal conduit.
16 . The method of claim 11 , the method further comprising receiving an interface defining the receiving volume proximate the removal conduit.
17 . The method of claim 11 , wherein the sampling device performs at least one of capillary electrophoresis and liquid chromatography to obtain the sample.
18 . The method of claim 11 , the method further comprising receiving the sample and the separation solution from the capillary, wherein the sample and the separation solution are released from the second end of the capillary under gravity into the receiving volume.
19 . The method of claim 11 , wherein the separation solution is diluted by the transport liquid to allow for ionization by the mass analysis system.