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Method and apparatus for pumping and diluting a sample

A sample and equipment technology, applied in the field of suction and dilution samples and equipment, can solve the problem of not having a flow rate range, and achieve the effect of overcoming the problem of memory effect

Inactive Publication Date: 2005-09-28
热电子公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as previously mentioned, peristaltic pumps do not have sufficient flow rate range and are not precise enough to dispense sample solutions at low enough flow rates to avoid releasing useful fluid into waste containers
Additionally, the use of peristaltic pumps limits the achievable dilution factor due to their limited effective flow rate range

Method used

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  • Method and apparatus for pumping and diluting a sample
  • Method and apparatus for pumping and diluting a sample
  • Method and apparatus for pumping and diluting a sample

Examples

Experimental program
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Embodiment Construction

[0039] Referring to Figure 3, there is shown in diagrammatic form a pump system 50 embodying the present invention. The sample 52 to be analyzed is drawn from the container by the autosampler 54 along a first conduit or sample draw conduit 56 to a valve or conduit flow switch 58 . The autosampler used in this example is well known in the art and includes a pump (not shown) and a probe 60 . The probe is movable for insertion into a fluid in a container located below the probe. Different containers can be placed on a carousel (not shown) so that different samples or washes 62 can be drawn into the pump system by the probe and autosampler pumps.

[0040] The switch 58 includes six input / output ports A, B, C, D, E, and F, and three internal conduits or conduits each joining one port to the other. The switch is movable between two positions such that when the switch is moved, the flow of fluid from one conduit to another can be switched from the conduit to a different conduit. T...

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PUM

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Abstract

A pumping apparatus ( 50 ) which isolates a sample ( 52 ) from a pump ( 72 ), thereby circumventing the so-called 'memory effect' problem. The sample is pumped into an intermediary, or buffer region ( 64 ) using a first pump ( 54 ). The sample is displaced from this buffer region by pumping a second fluid ( 74 ) into the buffer region using a second pump ( 72 ). When the sample is displaced from the buffer region it proceeds to a mixer ( 78 ) where it can be diluted before analysis. The second pump is required to operate with a high degree of accuracy so that the sample is diluted by a consistent amount. Preferably, the second pump is a highly accurate piston pump.

Description

technical field [0001] The present invention relates to a method and a device for aspirating a sample to an analysis device and diluting the sample before analyzing it, or for any other reason. [0002] Herein, the invention is described with reference to a liquid sample that needs to be diluted before being analyzed in a mass spectrometer. However, the invention is not limited to liquid samples or mass spectrometry, and the invention is equally applicable to dissolved or suspended samples and any other testing or analysis equipment. Background technique [0003] Analytical equipment for the analysis of trace elements in liquids is critical for dissolved solid materials or matrices such as CaCO 3 or salts or similar dissolved in water) have limited measurement capabilities. The trace elements that users are concerned about usually only account for a few parts per billion or less, while the matrix can account for several parts per million or more. Such high levels of matri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/00G01N1/10G01N1/38G01N35/08
CPCG01N35/08G01N1/38G01N35/1097
Inventor 菲利普·尼尔·肖菲利普·马里奥特
Owner 热电子公司
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