Resonance scattering spectrometry for measuring ammonia nitrogen in water rapidly

A technique of resonance scattering and rapid measurement, applied in the field of analytical chemistry, can solve the problems of complicated operation, insufficient sensitivity, long measurement time, etc., and achieve the effect of high sensitivity, easy availability of reagents and simple instrument.

Inactive Publication Date: 2009-10-07
GUANGXI NORMAL UNIV
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Problems solved by technology

Some of these determination methods are not sensitive enough. Metal ions such as calcium, magnesium and iron, sulfides, aldehydes and ketones in the water samples, water samples are colored, turbid, and contain other interfering substances, which all affect the determination. For the corresponding pretreatment, the measurement time is relatively long and the operation is cumbersome

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  • Resonance scattering spectrometry for measuring ammonia nitrogen in water rapidly

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[0017] (1) Standard system for preparing ammonium chloride: Add 0.3mL 1.77mol / L potassium sodium tartrate solution and 0.1mL Nessler's reagent to five 5mL colorimetric tubes, mix well, and then pipette Inject 0-150 μL of ammonium chloride standard solution with a concentration of 10 μg / mL into 5 color tubes, mix well, then add ammonia-free water to 5.0 mL, and place at room temperature for 20 minutes;

[0018] (2) prepare blank control system with the method of step (1), do not add ammonium chloride standard solution;

[0019] (3) Take the above-mentioned systems in different quartz cells, and scan the excitation wavelength λex and emission wavelength λem (λex=λem) synchronously on the fluorescence spectrophotometer to obtain the synchronous scattering resonance spectrum of the system, and measure the scattering intensity at 447nm I, the reagent blank is I 0 , to calculate ΔI 447nm =I-I 0 ;

[0020] (4) by ΔI 447nm Make a working curve for the concentration relationship o...

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Abstract

The present invention discloses a resonance scattering spectrometry for measuring ammonia nitrogen in water rapidly, the measurement steps is that 1. a standard system of ammonium muriate is prepared, and a scattering intensity I is mensurated at a point of 447m; 2. a blank system without ammonium muriate is prepared, and a scattering intensity I0 is mensurated; 3. calculation of Delta I447m = I-I0; 4. a working curve is made according to the concentration relation of the Delta I447m to the ammonium muriate; 5. a detection system is prepared by adding a measuring object containing ammonium muriate with ignorance concentration, and Delta I447M of the measuring system is obtained; 6. according to the working curve, the ammonium muriate concentration of the measuring object is calculated. Comparing with the existing method, the instrument of the method of the invention is simple, operation is easy, reagent is obtained easily, sensitivity is high, measurement range is wide, and cost is low.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a resonance scattering spectrometry method for quickly measuring ammonia nitrogen in water. Background technique [0002] Ammonia nitrogen widely exists in rivers, rivers, lakes, seas, surface water and groundwater, and is one of the important indicators for water quality evaluation. The amount of nitrogen compounds in the water can be used as an indicator of the degree of pollution of the water body by nitrogen-containing organic substances. At present, the methods for determining ammonia nitrogen mainly include Nessler colorimetry, phenol-hypochlorite (or salicylic acid-hypochlorite) colorimetric method, electrode method and distillation-titration method. The Nessler colorimetric method is a classic method for the determination of ammonia and is listed as a standard analysis method in many countries. Some of these determination methods are not sensitive enough. Metal ions ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/51
Inventor 蒋治良周莲平覃惠敏梁爱惠李付亚温桂清
Owner GUANGXI NORMAL UNIV
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