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Ion test means having a porous carrier matrix

  • US 4,670,218 A
  • Filed: 06/24/1985
  • Issued: 06/02/1987
  • Est. Priority Date: 02/24/1984
  • Status: Expired due to Term
First Claim
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1. A test means for determining the presence of an ion in an aqueous test sample, the test means comprising a carrier matrix having a porous structure substantially uniformly incorporated with(a) a homogeneous hydrophobic composition containing an ionophore capable of forming a complex with a specific ion to be determined, a reporter substance capable of interacting with the complex of the ionophore and the ion to produce a detectable response and a hydrophobic substance;

  • and(b) a buffering substance capable of providing a pH in the range of from about 5 to 10;

    the porous structure of the matrix being maintained after the incorporation and drying wherein an aqueous sample flows readily into the carrier matrix upon contact.

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