A coated-platinum sulfate-selective electrode |
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Authors: | Elizabeth W Baumann |
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Institution: | Savannah River Laboratory, E.I. du Pont de Nemours and Co., Aiken, South Carolina 29801 U.S.A. |
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Abstract: | Sulfate-selective electrodes can be fabricated from commercial platinum electrodes by coating them with a mixture of Aliquat-336 and trifluoroacetyl-p-butylbenzene in polyvinyl chloride matrix. Adding a solid, sparingly soluble sulfate such as that of strontium, lead, barium, or 2-aminoperimidine (2-AP) improves the selectivity for sulfate relative to nitrate. The 2-AP electrode shows the best physical stability and is described in detail. The order ofanion interference is ClO4->Cl->NO3->H2PO4->F-. The useful pH range is 4–9. The response is Nernstian from 10-5 to 10-1 M in sodium sulfate solutions. |
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