Method for voltammetric determination of nitrate and nitrite专利检索-伏安图机电学专利检索查询-专利查询网

Method for voltammetric determination of nitrate and nitrite

阅读：662发布：2021-01-26

专利汇可以提供Method for voltammetric determination of nitrate and nitrite专利检索，专利查询，专利分析的服务。并且Nitrate and/or nitrite in water are determined by a cadmium electrode maintained at a critical negative potential and with the test solution at a hydrogen ion concentration favoring the reduction of nitrate and nitrite to hydroxylamine, the detected current being linearly proportional to the nitrate or nitrite concentration. Interfering metal ions are replaced with hydrogen ions by cation exchange, and the nitrate, nitrite, and dissolved oxygen components of the test solution are chromatographically separated in an anion exchange column. For effective separation of the dissolved oxygen and the nitrite, the chromatographic adsorption is preferably made from a solution stream at a lower hydrogen concentration than the hydrogen ion concentration used during the voltammetric determination. The method can be carried out by an analyzer apparatus producing a chromatogram.，下面是Method for voltammetric determination of nitrate and nitrite专利的具体信息内容。

权利要求

1. THE VOLTAMMETRIC METHOD OF DETERMINING THE CONCENTRATION OF SMALL AMOUNTS OF NITRATE AND/OR NITRITE IN WATER, CHARACTERIZED BY THE STEP OFL: A. MAINTAINING A CADMIUM ELECTRODE AT A NEGATIVE POTENTIAL IN THE RANGE OF -0.80 TO -1.15 VOLTS WITH REFERENCE TO A SATURATED CALOMEL ELECTRODE; B. CONTACTING AN AQUEOUS TEST SOLUTION WITH SAID CADMIUM ELECTRODE, SAID SOLUTION CONTAINING UP TO ABOUT 15 PPM NITROGEN AS AN UNKNOWN CONCENTRATION OF NITRATE AND/OR NITRITE, SAID SOLUTION HAVING A HYDROGEN ION CONCENTRATION IN THE RANGE OF 0.001 TO 5 MOLAR FAVORING THE REDUCTION OF SAID NITROGEN OXIDE ION TO HYDROXYLAMINE; AND

2. The method steps of claim 1 further characterized in that said cadmium electrode is maintained at a constant negative potential in the range of -0.90 to -1.05 volts with referenee to a saturated calomel electrode.

3. The method steps of claim 1 further characterized in that said test solution has a hydrogen ion concentration of 0.01 to 1.0 molar.

4. The method steps of claim 1 further characterized in the said cadmium electrode is in the form of a tube and said test solution is passed continuously at a uniform rate through said electrode tube.

5. The voltammetric method of determining the concentration of small amounts of nitrate and/or nitrite in water, characterized by the steps of: a. maintaining a cadmium electrode at a negative potential in the range of -0.90 to -1.05 volts with reference to a saturated calomel electrode; b. contacting an aqueous test solution with said cadmium electrode, said solution containing up to about 15 ppm nitrogen as an unknown concentration of nitrate and/or nitrite, said solution having a hydrogen ion concentration from 0.01 to 1.0 molar; and c. detecting the current flow between said cadmium electrode and a counter electrode in contact with said test solution.

6. The method steps of claim 5 further characterized in that said calmium electrode is in the form of a tube and said test solution is passed continuously at a uniform rate through said electrode tube.

7. The voltammetric method of determining the concentration of small amounts of nitrate and/or nitrite in water, characterized by the steps of: a. maintaining a cadmium electrode at a constant negative potential in the range of -0.90 to -1.05 volts with reference to a saturated calomel electrode, said cadmium electrode being in the form of a tube; b. passing an aqueous test solution at a constant flow rate through said tubular cadmium electrode, said solution containing up to about 15 ppm nitrogen as an unknown concentration of nitrate and/or nitrite, said solution having a hydrogen ion concentration in the range of 0.001 to 5 molar favoring the reduction of said nitrogen oxide ion to hydroxylamine; and c. detecting the current flow between said cadmium electrode and a counter electrode in contact with said test solution.

8. In a method of determining the concentration of small amounts of nitrate and/or nitrite in an aqueous test solution containing metal ions and dissolved oxygen, the steps comprising: a. removing the metal cations from said test solution and replacing them with hydrogen ions; b. chromatographically separating said nitrate, nitrite, and oxygen components by successive adsorption and elution in a column of a strong cation exchange resin to provide an eluent containing up to about 15 ppm nitrogen as an unknown concentration of nitrate and/or nitrite; and c. voltammetrically determining the concentration of the separated nitrate and/or nitrite in the eluent by flowing said eluent through a tubular cadmium electrode maintained at a negative potential in the range of -0.80 to -1.15 volts with reference to a saturated calomel electrode.

9. The method steps of claim 8 in which said voltammetric determination is carried out at a hydrogen ion concentration in said tubular electrode of 0.01 to 1.0 molar.

10. The method steps of claim 8 in which said cadmium electrode is maintained at a constant negative potential in the range of -0.90 to -1.05 volts.

说明书全文

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