Method for directly measuring content of nitrate in seawater and application of method

A technology of nitrate content and determination method, which is applied in the field of direct determination of nitrate content in seawater, can solve problems such as inapplicable nitrate content, and achieve the effects of high accuracy, good precision and simple operation

Active Publication Date: 2022-01-04
HAINAN UNIVERSITY
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Problems solved by technology

However, this method is not suitable for the determination of nitrate content in seawater samples or other salty water samples, because the interference factors such as complex salt in seawater will interfere with the method, resulting in no peak at low concentration of nitrate content and cannot be used

Method used

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  • Method for directly measuring content of nitrate in seawater and application of method
  • Method for directly measuring content of nitrate in seawater and application of method
  • Method for directly measuring content of nitrate in seawater and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Determination of nitrate in seawater of shrimp culture in a company in Wenchang City.

[0071] S1, preparation solution:

[0072] Blank solution / diluted solution: Collect clean seawater, filter it with a 0.45μm filter membrane, add anhydrous sodium carbonate to alkalinize to pH=10±0.1, add the same volume of distilled water, boil and evaporate to the original volume, then add 1+9 hydrochloric acid dropwise Adjust the pH to 7±0.1 to obtain ammonia-free seawater; for long-term storage, add 1mL of chloroform to each liter of ammonia-free seawater, mix well, and seal it in a light-proof reagent bottle for long-term storage. Its salinity is 33.4ppt and conductivity is 51.0mS / cm.

[0073] Nitrate nitrogen standard stock solution: Weigh 0.7218g of premium pure potassium nitrate (KNO 3 ), dissolved in water, added 1mL of chloroform as a preservative, and adjusted to 1000mL, mixed well to obtain a standard stock solution containing 100mg / L of nitrate nitrogen.

[0074] Nitrat...

example 2

[0090] Determination of Nitrate Nitrogen Content in High Salt Amino Acid Industrial Wastewater from a Fine Chemical Company in Jiujiang

[0091] The analysis process is the same as example 1, because the salinity of the sample reaches 113ppt, the pH is 6.1, and the NO 3 - -N concentration is too high, exceeding the maximum concentration of the standard curve, so the samples were diluted 10 times and 20 times respectively. The calculated recovery rate of standard addition is shown in Table 3. The recovery rate of standard addition is between 98.4% and 101.7%, and the relative standard deviation is less than 2.04%. Therefore, the recovery rate and precision of this method are good, and it is also suitable for certain salt-containing Determination of industrial wastewater samples.

[0092] Table 3 Determination results of nitrate nitrogen spiked recovery rate in certain saline amino acid wastewater

[0093] water sample Sample content μg Scaling amount μg Measu...

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Abstract

The invention provides a method for directly measuring the content of nitrate in seawater and application of the method. According to the method, ammonia-free seawater is used as a blank solution and a diluted solution, so that the influence of background factors such as salinity in a seawater sample on determination is eliminated, meanwhile, scanning treatment is performed by adopting a second derivative ultraviolet spectrum method, the interference of other substances near an ultraviolet absorption peak of nitrate is eliminated, and the accuracy and selectivity of the method are effectively ensured. The method has the characteristics of good selectivity, wide linear range, high accuracy and good stability, can quickly and effectively detect the nitrate content in the seawater sample, and can be used for batch inspection. According to the method, no masking agent needs to be additionally added, the nitrate content in the sample can be directly measured after filtration, and the method has the advantages of being small in interference, easy to operate, high in speed, high in recovery rate, good in precision and the like and is suitable for rapidly and directly measuring the nitrate content in seawater, other saline water samples and some salt-containing industrial wastewater.

Description

technical field [0001] The invention relates to the technical field of environmental detection and analysis, in particular to a method for directly measuring nitrate content in seawater and its application. [0002] technical background [0003] In the prior art, the cadmium column reduction method (GB17378.4-2007) is mainly used to determine the nitrate content in seawater. Azo spectrophotometry is used to measure the nitrite content, and the original nitrite content in the water sample is deducted to obtain the nitrate content. The cadmium column reduction method has the advantages of high sensitivity, less interference, and stable color development. However, this method has cumbersome steps, long detection cycle, large consumption of reagents, and cannot achieve rapid measurement. In addition, gas-phase molecular absorption spectrometry, flow analysis, ion chromatography, etc. are also commonly used for the determination of nitrate content in seawater, but these methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N1/28G01N1/38
CPCG01N21/33G01N1/28G01N1/38
Inventor 杨飞郭小夏潘国英文畅黄薇薇周梅阳
Owner HAINAN UNIVERSITY
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