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Title: Method for preconcentrating a sample for subsequent analysis

Abstract

A system for analysis of trace concentration of contaminants in air includes a portable liquid chromatograph and a preconcentrator for the contaminants to be analyzed. The preconcentrator includes a sample bag having an inlet valve and an outlet valve for collecting an air sample. When the sample is collected the sample bag is connected in series with a sorbing apparatus in a recirculation loop. The sorbing apparatus has an inner gas-permeable container containing a sorbent material and an outer gas-impermeable container. The sample is circulated through the outer container and around the inner container for trapping and preconcentrating the contaminants in the sorbent material. The sorbent material may be a liquid having the same composition as the mobile phase of the chromatograph for direct injection thereinto. Alternatively, the sorbent material may be a porous, solid body, to which mobile phase liquid is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.

Inventors:
 [1]
  1. (Hinsdale, IL)
Issue Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
867457
Patent Number(s):
4942135
Assignee:
United States of America as represented by United States (Washington, DC) ANL
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; preconcentrating; sample; subsequent; analysis; trace; concentration; contaminants; air; portable; liquid; chromatograph; preconcentrator; analyzed; bag; inlet; valve; outlet; collecting; collected; connected; series; sorbing; apparatus; recirculation; loop; inner; gas-permeable; container; containing; sorbent; material; outer; gas-impermeable; circulated; trapping; composition; mobile; phase; direct; injection; thereinto; alternatively; porous; solid; added; preconcentration; dissolving; solution; withdrawn; mobile phase; phase liquid; outlet valve; inlet valve; liquid chromatograph; subsequent analysis; inner container; outer container; liquid solution; sorbent material; air sample; container containing; recirculation loop; circulation loop; direct injection; trace concentration; portable liquid; /436/73/95/96/422/

Citation Formats

Zaromb, Solomon. Method for preconcentrating a sample for subsequent analysis. United States: N. p., 1990. Web.
Zaromb, Solomon. Method for preconcentrating a sample for subsequent analysis. United States.
Zaromb, Solomon. Mon . "Method for preconcentrating a sample for subsequent analysis". United States. https://www.osti.gov/servlets/purl/867457.
@article{osti_867457,
title = {Method for preconcentrating a sample for subsequent analysis},
author = {Zaromb, Solomon},
abstractNote = {A system for analysis of trace concentration of contaminants in air includes a portable liquid chromatograph and a preconcentrator for the contaminants to be analyzed. The preconcentrator includes a sample bag having an inlet valve and an outlet valve for collecting an air sample. When the sample is collected the sample bag is connected in series with a sorbing apparatus in a recirculation loop. The sorbing apparatus has an inner gas-permeable container containing a sorbent material and an outer gas-impermeable container. The sample is circulated through the outer container and around the inner container for trapping and preconcentrating the contaminants in the sorbent material. The sorbent material may be a liquid having the same composition as the mobile phase of the chromatograph for direct injection thereinto. Alternatively, the sorbent material may be a porous, solid body, to which mobile phase liquid is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

Patent:

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