Measurement device and measurement method for high-accuracy in-situ detection on pH of seawater

An in-situ detection and measurement device technology, applied in the field of environmental chemical monitoring, can solve the problems of complex structure, low integration, large volume, etc.

Active Publication Date: 2014-09-24
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most sensors are in the stage of laboratory research and development, and there are common defects such a...

Method used

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  • Measurement device and measurement method for high-accuracy in-situ detection on pH of seawater
  • Measurement device and measurement method for high-accuracy in-situ detection on pH of seawater
  • Measurement device and measurement method for high-accuracy in-situ detection on pH of seawater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this embodiment, the structure of the measuring device for high-precision in-situ detection of seawater pH is as follows: figure 1 As shown, it includes water circuit components, optical circuit components, circuit control system and computer processing system. The waterway assembly includes an indicator bag 1 , an indicator pump 2 , a seawater pump 3 , a tee 4 , a fluid pipeline 5 , a mixer 6 , a Z-shaped flow cell 7 and a waste liquid pipeline 8 . The tee has two inlets and one outlet, the two inlets are respectively connected to the indicator pump and the seawater pump, the outlet is connected to the fluid pipeline, the mixer, and the flow cell in turn, and the flow cell is also connected to Waste line. Wherein the indicator pump is a micropump, and the seawater pump is a peristaltic pump, which respectively pumps the indicator and seawater into the fluid pipeline through a tee for mixing; inside the mixer is a curved fluid pipeline, which is beneficial for seawa...

Embodiment 2

[0047] In this embodiment, the measuring device described in Example 1 is used to detect the pH value of the profile seawater, the indicator is thymol blue, the optical flow cell 7 has an optical path of 2 cm, and the specific detection wavelengths of the three light sources are 435nm, 596nm and 780nm.

[0048] The operation steps of the test analysis of this embodiment:

[0049] 1. Preparation of indicator

[0050] Prepare a mixed solution of 8mmol / L and NaCl concentration of 0.7 mol / L with a thymol blue sodium salt concentration, and adjust the R value of the mixed solution to 0.8 with 1.0mol / L hydrochloric acid.

[0051] 2. Calibration of indicator interference in the laboratory

[0052] Since the indicator itself is a dibasic acid, it will interfere with the pH of seawater, so it is necessary to correct the interference of the indicator on the pH value of seawater in the laboratory before on-site measurement.

[0053] A series of seawater samples with different pH were s...

Embodiment 3

[0057] In this example, the measuring device described in Example 1 is used to analyze the pH value of seawater at a fixed point, the indicator is thymol blue, the optical flow cell 7 has an optical path of 2 cm, and the specific detection wavelengths of the three light sources are 435nm, 596nm and 780nm.

[0058] 1. Preparation of indicator

[0059] Prepare the mixed solution whose concentration of thymol blue sodium salt is 8mmol / L and the NaCl concentration of 0.7 mol / L, and adjust the R value of the mixed solution to 0.8 with 1.0mol / L hydrochloric acid.

[0060] 2. Correction of absorbance ratio R in the laboratory

[0061]A series of seawater samples with different pH values ​​were selected. First, use the seawater pump 3 to pump a certain seawater sample into the fluid pipeline 5 at a certain flow rate v, detect the light intensity of the blank in the flow cell 7, then start the indicator pump 2, and pump a certain volume V into the fluid pipeline 5 After the indicator...

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Abstract

The invention provides a measurement device and a measurement method for high-accuracy in-situ detection on pH of seawater. The measurement device comprises a water path component, a light path component, a circuit control system and a computer processing system. Sample introduction and mixing of the seawater and an indicator are completed only by a peristaltic pump, a pulse pump, a tee joint and a flow cell, furthermore, in the light path system, an light emitting diode (LED) lamp and a photodiode replace a thermal radiation light source and a commercialized detector, so that the cost and the power consumption are lowered, and the measurement device can be conveniently used in field monitoring sensors. Based on a spectrophotonetry and flow injection analysis, the measurement device for the detection on the pH of the seawater can be used as a section or fixed point analysis meter for the detection on the pH of the seawater. The measurement device can calculate the pH of the seawater through detecting the absorbance of a mixed solution of the seawater and the indicator, has the high precision degree and good accuracy, and is applicable to field monitoring, and the step of baseline correction by adopting an electrode detection method is omitted.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical monitoring, and in particular relates to a measuring device and a measuring method for high-precision in-situ detection of seawater pH. Background technique [0002] pH can reflect the acid-base state of the water body and is one of the most important parameters to quantitatively describe the chemical characteristics of the ocean. Real-time tracking of in-situ pH changes in the ocean can assess the impact of future ocean acidification on ecosystems, and can also reflect the impact of atmospheric CO 2 Concentration changes, thereby deepening the understanding of the global carbon cycle. Therefore, obtaining high-precision pH results is a prerequisite for understanding ocean acidification and the carbon cycle. However, ocean acidification is a slow process. The average annual seawater pH value drops to 0.002. At the same time, the pH value is used to accurately and quantitatively de...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 曹璐马然张述伟褚东志程岩郭翠莲石小梅王茜张颖吴宁吴丙伟曹煊高杨王昭玉范萍萍吕婧张国华张颖颖刘岩
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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