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Detection reagent combination for automatic ammonia nitrogen analyzer and method for measuring ammonia nitrogen concentration in water sample

An automatic analyzer and detection reagent technology, applied in the field of analytical chemistry, can solve problems such as inability to ensure sensitivity and non-disclosure

Inactive Publication Date: 2015-04-29
SHENZHEN ENVIRONMENTAL MONITORING CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN1877311A discloses a rapid detection reagent for ammonia nitrogen concentration in water samples and its usage. The detection reagent in this document uses visual colorimetry to detect the concentration of ammonia nitrogen in water samples, which largely depends on people's visual inspection and cannot ensure the determination Sensitivity, and this document does not disclose or suggest the detection reagent suitable for ammonia nitrogen automatic analyzer

Method used

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  • Detection reagent combination for automatic ammonia nitrogen analyzer and method for measuring ammonia nitrogen concentration in water sample
  • Detection reagent combination for automatic ammonia nitrogen analyzer and method for measuring ammonia nitrogen concentration in water sample
  • Detection reagent combination for automatic ammonia nitrogen analyzer and method for measuring ammonia nitrogen concentration in water sample

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Embodiment 1

[0055] The detection reagent combination of the ammonia nitrogen automatic analyzer in this embodiment includes a first reagent and a second reagent.

[0056] The first reagent contains dichloro-isocyanuric acid and sodium hydroxide with a weight ratio of 9.27:28. The first reagent is in the form of an aqueous solution. The concentration of dichloro-sodium isocyanurate in the first reagent is 9.27g / 2L, hydrogen The concentration of sodium oxide in the first reagent is 28g / 2L. In an indoor environment with a room temperature of 26.2°C and a relative humidity of 64%, the pH of the first reagent is 12-13.

[0057] The second reagent contains sodium salicylate, sodium hydroxide, sodium nitrosoferrocyanide and potassium sodium tartrate in a weight ratio of 93.3:5.2:10.67:50. The second reagent is in the form of an aqueous solution, and sodium salicylate is in The concentration of the second reagent is 93.3g / 2L, the concentration of sodium hydroxide in the second reagent is 5.2g / 2L...

Embodiment 2

[0084] The detection reagent combination of the ammonia nitrogen automatic analyzer in this embodiment includes a first reagent and a second reagent.

[0085] The first reagent contains sodium hydroxide and dichloro-isocyanuric acid with a weight ratio of 25:8, the first reagent is in the form of an aqueous solution, the concentration of sodium hydroxide in the first reagent is 25g / 2L, dichloro-isocyanuric acid The concentration of sodium in the first reagent is 8g / 2L. In an indoor environment with a room temperature of 26.2°C and a relative humidity of 64%, the pH of the first reagent is 12-13.

[0086] The second reagent contains sodium salicylate, sodium hydroxide, sodium nitrosoferrocyanide and potassium sodium tartrate in a weight ratio of 85:4.5:9.7:48. The second reagent is in the form of an aqueous solution, and sodium salicylate is in The concentration of the second reagent is 85g / 2L, the concentration of sodium hydroxide in the second reagent is 4.5g / 2L, the concent...

Embodiment 3

[0092] The detection reagent combination of the ammonia nitrogen automatic analyzer in this embodiment includes a first reagent and a second reagent.

[0093] The first reagent contains sodium hydroxide and dichloro-isocyanuric acid with a weight ratio of 29:9, the first reagent is in the form of an aqueous solution, the concentration of sodium hydroxide in the first reagent is 29g / 2L, dichloro-isocyanuric acid The concentration of sodium in the first reagent is 9g / 2L. In an indoor environment with a room temperature of 26.2°C and a relative humidity of 64%, the pH of the first reagent is 12-13.

[0094] The second reagent contains sodium salicylate, sodium hydroxide, sodium nitrosoferrocyanide and potassium sodium tartrate in a weight ratio of 90:4.9:10:49. The second reagent is in the form of an aqueous solution, and sodium salicylate is in The concentration of the second reagent is 90g / 2L, the concentration of sodium hydroxide in the second reagent is 4.9g / 2L, the concentr...

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Abstract

The invention relates to a detection reagent combination for an automatic ammonia nitrogen analyzer and a method for measuring ammonia nitrogen concentration in a water sample. The detection reagent combination is applied to a salicylic acid spectrophotometric method. The detection reagent combination comprises a first reagent and a second reagent, wherein the first reagent contains an alkaline agent and an oxidant according to a weight ratio of (25-30):(8-10); the oxidant refers to sodium dichloroisocyanurate; the second reagent contains a color developing agent, an alkaline agent, a catalyst and a masking agent according to a weight ratio of (85-95):(4.5-5.5):(9.7-11):(48-52); the color developing agent refers to salicylate; the catalyst refers to nitroso ferrous cyanide salt; and the masking agent refers to tartrate. The detection reagent combination disclosed by the invention can be universally applied to automatic ammonia nitrogen analyzers of the salicylic acid spectrophotometric method in various different manufacturers, the cost is less than 1 / 10 of that of an imported reagent, and the detection reagent combination can be preserved at normal temperature, does not need to be subjected to cold preservation and has high stability, color developing sensitivity and linearity.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a detection reagent combination for an automatic ammonia nitrogen analyzer. The invention also relates to a method for measuring the ammonia nitrogen concentration in the water sample. Background technique [0002] The operation of the existing method for determining the concentration of ammonia nitrogen in water samples has a distinction between manual analysis in the laboratory and automatic online analysis; among them, the methods for manually analyzing the concentration of ammonia nitrogen in water samples in the laboratory include: visual colorimetry, salicylic acid spectrophotometry method and Nessler's reagent method, etc.; and ammonia nitrogen automatic analyzers include: German Kozer K301 type, HACH AMTAX inter2 type, etc. The ammonia nitrogen automatic analyzer has the characteristics of fast analysis speed, high accuracy and good reproducibility, and compared with ...

Claims

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Application Information

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IPC IPC(8): G01N31/22G01N21/78
Inventor 罗澍梁鸿陈慧明侯华明郭键锋何龙黄远峰颜宇春黄杰华马彬李仕平张晓东杨小妮陈德华
Owner SHENZHEN ENVIRONMENTAL MONITORING CENT
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