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Method for eliminating interference of original matter in sewage on ammonia nitrogen water quality on-line monitor

A technology of interference elimination and monitoring instrument, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as interference

Inactive Publication Date: 2012-06-20
BOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for eliminating the interference of raw substances in sewage on the ammonia nitrogen water quality online monitor based on the Nessler reagent method, so as to solve the online monitoring of ammonia nitrogen concentration monitoring in water using the Nessler reagent method During the use of the instrument, there is the problem of the original substance interference in the sewage that causes the change of the absorbance during the measurement process, so as to reduce and eliminate the influence of other pollutants on the measurement results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Use the mixed solution of component A (potassium sodium tartrate) and NaOH as a masking agent, the concentration of potassium sodium tartrate in the mixed solution is 200 g / L, and the concentration of NaOH is 0.3mol / L; accurately weigh the required potassium tartrate Sodium, after dissolving with distilled water, add the required amount of high-concentration NaOH solution, stir evenly and then constant volume;

[0022] 2. Use the mixed solution of mercury iodide, potassium iodide and NaOH as the Nessler reagent, the concentration of mercury iodide in the mixed solution is 15g / L, the concentration of potassium iodide is 10 g / L, and the concentration of NaOH is 1.0 mol / L; accurate Weigh the required mercuric iodide and potassium iodide, fully stir and dissolve with distilled water at room temperature, slowly add the required amount of high-concentration NaOH solution, stir evenly and then constant volume;

[0023] 3. Determination of Absorbance of Reference Samples

...

Embodiment 2

[0033] 1. Use the mixed solution of component A (potassium sodium tartrate) and NaOH as a masking agent, the concentration of potassium sodium tartrate in the mixed solution is 300 g / L, and the concentration of NaOH is 0.8 mol / L; accurately weigh the required potassium tartrate Sodium, after dissolving with distilled water, add the required amount of high-concentration NaOH solution, stir evenly and then constant volume;

[0034] 2. Use the mixed solution of mercury iodide, potassium iodide and NaOH as Nessler's reagent, the concentration of mercury iodide in the mixed solution is 20 g / L, the concentration of potassium iodide is 20 g / L, and the concentration of NaOH is 0.3 mol / L; Accurately weigh the required mercuric iodide and potassium iodide, fully stir and dissolve with distilled water at room temperature, slowly add the required amount of high-concentration NaOH solution, stir evenly and then constant volume;

[0035] 3. Determination of Absorbance of Reference Samples ...

Embodiment 3

[0045]1. Use the mixed solution of component A (potassium sodium tartrate) and NaOH as a masking agent, the concentration of potassium sodium tartrate in the mixed solution is 500 g / L, and the concentration of NaOH is 1.0 mol / L; accurately weigh the required potassium tartrate Sodium, after dissolving with distilled water, add the required amount of high-concentration NaOH solution, stir evenly and then constant volume;

[0046] 2. Use the mixed solution of mercury iodide, potassium iodide and NaOH as Nessler's reagent, the concentration of mercury iodide in the mixed solution is 25 g / L, the concentration of potassium iodide is 25 g / L, and the concentration of NaOH is 0.7 mol / L; Accurately weigh the required mercuric iodide and potassium iodide, fully stir and dissolve with distilled water at room temperature, slowly add the required amount of high-concentration NaOH solution, stir evenly and then constant volume;

[0047] 3. Determination of Absorbance of Reference Samples ...

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Abstract

A method for eliminating interference of original matter in sewage on an ammonia nitrogen water quality on-line monitor solves the problem of interference of the original matter in the sewage and resulting in changes of absorbance in the determining process during the use of an on-line monitor used for monitoring ammonia nitrogen concentration in water and utilizing a Nessler's reagent method. The technical scheme of the method is that regarding distilled water as a reference sample, adding a screening agent and a Nessler's reagent into the distilled water, and determining the absorbance of the reference sample after color development; fetching a standard water sample as a standard sample, adding the distilled water, the screening agent and the Nessler's reagent into the standard water sample, and determining the absorbance of the standard sample after color development; fetching a water sample to be tested, adding the distilled water, the screening agent and the Nessler's reagent into the water sample to be tested, and determining the absorbance of the water sample to be tested after color development, wherein the screening agent is mixed solution of component A and strong base, the component A is potassium sodium tartrate or sodium citrate or potassium citrate, and the Nessler's reagent is mixed solution of mercuric iodide, potassium iodide and the strong base; and inputting determined data into a computer system to calculate the concentration of the ammonia nitrogen in the water sample to be tested.

Description

technical field [0001] The invention relates to a sewage online monitoring technology, in particular to a method for eliminating the interference of raw substances in sewage on an ammonia nitrogen water quality online monitor based on Nessler's reagent method. Background technique [0002] Inorganic nitrogen pollutants in water include ammonia nitrogen, nitrate nitrogen and nitrite nitrogen. High nitrate content can lead to eutrophication of the water body. Nitrite is a strong carcinogen and is extremely harmful to the human body. Different forms of nitrogen in water can be transformed into each other under certain environmental conditions, which constitutes an important part of the nitrogen cycle. In an aerobic environment, aerobic microorganisms can convert ammonia into nitrite, and then further into nitrate. In an anaerobic environment, nitrate can also be reduced to nitrite under the action of anaerobic microorganisms, and then It is then reduced to ammonia. Therefore,...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 孙彤徐姝颖金振兴李铁军刘华刘月娇
Owner BOHAI UNIV
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