Method for estimating concentration of soluble inorganic carbon in water body

A technology of inorganic carbon and solubility, applied in the direction of chemical analysis by titration method, can solve the problems of complex processing process, high precision of testing equipment, expensive materials, etc., and achieve good correlation accuracy, high reliability, and simple method Effect

Active Publication Date: 2021-02-02
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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Problems solved by technology

[0004] The present invention aims to solve the technical problems of the existing test method for the concentration of dissolved inorganic carbon (DIC) in water bodies, such as high precision of testing instruments, expensive materials, and complicated pretreatment process of water samples, and provides a method for estimating the concentration of dissolved inorganic carbon in water bodies method, which is a new, convenient method for estimating DIC concentration covering all types of water bodies

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  • Method for estimating concentration of soluble inorganic carbon in water body
  • Method for estimating concentration of soluble inorganic carbon in water body
  • Method for estimating concentration of soluble inorganic carbon in water body

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Embodiment 1

[0020] Embodiment 1: The method for estimating the water body dissolved inorganic carbon concentration of the present embodiment is carried out according to the following steps:

[0021] 1. In 2018, samples were taken from 206 lakes, reservoirs, and rivers distributed across the country. The distribution of sampling points is as follows figure 1 As shown, 2 to 4 sampling points were set up for each water body, a total of 687 sampling points. The water sample was used to collect 2L water samples within 0.5 to 1m of the surface of the water body, and they were transported to the laboratory in the refrigerator for storage in the dark. Use the neutralization titration method to measure the total alkalinity of the water within 24 hours of delivery to the laboratory. The specific neutralization titration method to determine the total alkalinity of the water is as follows: After the water sample is filtered through 0.45 μm, excess hydrochloric acid is added to make the pH 3.5 , boil ...

Embodiment 2

[0029] Embodiment 2: The method for estimating the water body dissolved inorganic carbon concentration of the present embodiment is carried out according to the following steps:

[0030] 1. In 2019, samples were taken from 104 lakes, reservoirs, and rivers distributed across the country. 2 to 4 sampling points were set up for each water body, and a total of 344 sampling points were sampled. Water collectors were used to collect samples within 0.5 to 1m of the surface of the water body. The 2L water sample was placed in the car refrigerator and transported to the laboratory for storage in the dark and refrigerated. Within 24 hours of transporting to the laboratory, the total alkalinity of the water was determined by neutralization titration. The specific neutralization titration method was used to determine the total alkalinity of the water. The steps are as follows: After the water sample is filtered at 0.45 μm, excess hydrochloric acid is added to make the pH to 3.8, boiled, a...

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Abstract

The invention discloses a method for estimating the concentration of soluble inorganic carbon in a water body, which relates to a method for estimating the concentration of the soluble inorganic carbon in the water body, and aims to solve the technical problems of high precision of a test instrument, expensive materials and complex pretreatment process of a water sample in the conventional methodfor measuring the concentration of the soluble inorganic carbon (DIC) in the water body. The method comprises the following steps of collecting a water sample at a sampling point of a water body, placing the water sample in a vehicle-mounted refrigerator, transporting the water sample to a laboratory, refrigerating and storing in a dark place, and measuring the total alkalinity of the water body by utilizing a neutralization titration method within 24 hours after transporting to the laboratory, substituting the alkalinity of the water body into a formula DIC=0.2*Alk+2.6, and estimating the concentration of the soluble inorganic carbon in the water body. The method is simple, the ratio of the calculated DIC value to the actually measured DIC value is 0.98, and the correlation precision is good. The method can be used in water quality monitoring and environmental evaluation fields.

Description

technical field [0001] The invention relates to a method for estimating the concentration of dissolved inorganic carbon in water bodies, and belongs to the field of water environment evaluation of inland water bodies such as lakes, reservoirs and rivers. Background technique [0002] Dissolved Inorganic Carbon DIC (Dissolved Inorganic Carbon) is the ocean and inland water CO 2 An important parameter of the system, which links the exchange flow process of carbon among the atmosphere, hydrosphere, biosphere and lithosphere. In recent years, due to atmospheric CO 2 、CH 4 The "greenhouse effect" caused by such substances has become a hot issue of concern to the international community. Scientists predict that by mid-century, atmospheric CO 2 The concentration will double that of pre-industrialization, and global warming will intensify, triggering a series of changes such as melting glaciers, rising sea levels, and submerged cities, which will have a profound impact on the gl...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 吕丽丽宋开山温志丹刘阁尚盈辛杜嘉李思佳
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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