One step tester for ammonia
First Claim
1. An integral one-step analysis unit for direct analysis of ammonia employing a single reagent pad comprising an indicator layer and an absorbent layer, wherein:
- (i) said indicator layer comprises an ammonia indicator embedded in a continuous phase of a hydrophobic polymer so that gaseous ammonia, but not aqueous solutions, can penetrate the embedding hydrophobic polymer and reach the ammonia indicator. (ii) said absorbent layer is buffered with hydroxide to maintain the equilibrium concentration of ammonia to obtain best test color change result; and
(iii) the indicator layer is attached to the absorbent layer.
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Abstract
A one-step integral analysis unit for the direct analysis of ammonia, wherein all necessary reagents are located in a single reagent pad comprising an indicator layer and an absorbent layer. The indicator comprises an ammonia indicator embedded in a continuous phase of a hydrophobic polymer so that gaseous ammonia, but not aqueous solutions, can penetrate the embedding polymer and reach the indicator. The second absorbent layer is buffered with hydroxide to maintain the equilibrium concentration level of ammonia to obtain best test color change results. The absorbent layer is attached to a plastic carrier and the indicator layer is attached to the absorption layer.
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Citations
10 Claims
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1. An integral one-step analysis unit for direct analysis of ammonia employing a single reagent pad comprising an indicator layer and an absorbent layer, wherein:
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(i) said indicator layer comprises an ammonia indicator embedded in a continuous phase of a hydrophobic polymer so that gaseous ammonia, but not aqueous solutions, can penetrate the embedding hydrophobic polymer and reach the ammonia indicator. (ii) said absorbent layer is buffered with hydroxide to maintain the equilibrium concentration of ammonia to obtain best test color change result; and
(iii) the indicator layer is attached to the absorbent layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification