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Detection method of pH value of coastal seawater

A detection method and technology in coastal waters, applied in the direction of testing water, material inspection products, etc., can solve the problem of not considering the influence of the pH value of the organic carbon system

Active Publication Date: 2016-11-09
OCEAN UNIV OF CHINA
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Problems solved by technology

However, none of them considered the effect of organic carbon systems, especially low molecular weight organic acids, on seawater pH

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  • Detection method of pH value of coastal seawater
  • Detection method of pH value of coastal seawater
  • Detection method of pH value of coastal seawater

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Embodiment Construction

[0124] In view of the high concentration of low-molecular-weight organic acids in coastal seawater, this embodiment measures the concentration of total alkalinity, dissolved inorganic carbon, dissolved organic carbon, and low-molecular-weight organic acids in seawater, and combines temperature, salinity, and phosphate , silicate and other parameters, and finally achieve a more accurate detection of the pH value of coastal seawater.

[0125] The specific implementation manner will be described in detail below.

[0126] (1) Seawater samples were collected in Jiaozhou Bay in March 2013, and the parameters in the seawater samples were tested and analyzed using existing technologies. The specific data of each parameter are as follows:

[0127] Concentration of dissolved inorganic carbon C T =0.001993mol / kg-SW, temperature T=296.35K, salinity S=30.64, total alkalinity Alk=0.002262mol / kg-SW, phosphate concentration PT=7.91×10 -7 mol / kg-SW, silicate concentration SiT=6.98×10 -6 mol...

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Abstract

The invention provides a detection method of the pH value of coastal seawater. The pH value of coastal seawater rich in organic matters is accurately detected by detecting a variety of physical and chemical parameters of the seawater. The detection method comprises the following steps: acquiring a seawater sample; detecting a variety of physical and chemical parameters of the seawater sample; calculating the dissociation constants of a variety of acids; and analyzing and calculating the alkalinity of each component. According to the method, contribution of organic acids in the seawater to alkalinity is taken into consideration; the rule of influence of organic acids in the coastal seawater on the pH value is obtained through study; deviations caused by negligence of organic acids in the process of detection of the pH value of seawater are avoided; and a novel method is provided for high-precision detection of the pH value of the coastal seawater.

Description

technical field [0001] The invention relates to a method for detecting the pH value of offshore seawater, and belongs to the technical field of detection of the pH value of seawater. Background technique [0002] The pH value of seawater is a sign of the acidity and alkalinity of seawater, and its changes can affect many marine organisms and marine carbonate systems. Organic acids, especially low-molecular-weight organic acids, play an important role in regulating the pH value of seawater. Therefore, it is very necessary to deeply understand the influence of low-molecular-weight organic acids on reducing the pH value of seawater. [0003] Since the end of the 20th century, the problem of ocean acidification has gradually attracted the attention of researchers, and these experts have continuously perfected and improved the method for calculating the pH value of seawater. However, none of them considered the effect of organic carbon systems, especially low-molecular-weight or...

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Application Information

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IPC IPC(8): G01N33/18
CPCG01N33/18
Inventor 吕丽娜丁海兵陆道明孙承君梁皓瑞
Owner OCEAN UNIV OF CHINA
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