Microfluidic-circulation analysis-based high-precision in-situ seawater pH analysis system and method

An analysis system and high-precision technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of poor instrument stability, high power consumption, large volume, etc., achieve small reagent consumption, improve precision and accuracy, and high integration. Effect

Active Publication Date: 2014-10-29
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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  • Application Information

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Problems solved by technology

The reason is mainly due to the complex internal structure of the measurement system, large volume, and high power consumption.
Most of the water system of the instrument adopts the flow injection method, which leads to the unsteady mixing ratio of seawater and indicator, and the stability of the instrument is poor

Method used

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  • Microfluidic-circulation analysis-based high-precision in-situ seawater pH analysis system and method
  • Microfluidic-circulation analysis-based high-precision in-situ seawater pH analysis system and method
  • Microfluidic-circulation analysis-based high-precision in-situ seawater pH analysis system and method

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Embodiment 1

[0033] The high-precision in-situ seawater pH analysis system based on microfluidic-circulation analysis described in the present invention (such as figure 1As shown) includes a microfluidic chip A with a circulating mixing structure, a filter head B, a seawater pipeline C, an indicator bag D, an indicator pipeline E, a waste pipeline F, a bright white LED light G, and an optical fiber H , flow cell I, spectrometer J. Among them, the microfluidic chip A with a circulation mixing structure is provided with a plurality of chip channels forming a liquid loop, and the chip channels are provided with a plurality of micro solenoid valves 3-17 (hereinafter referred to as micro solenoid valves) for controlling the switch of the chip channel. valve), the chip channel is also provided with a micro piezoelectric pump 1, a micro-injection pump 2, a flow cell 1 and a liquid storage channel, and the two ends of the flow cell 1 are respectively connected with a bright white LED light G throu...

Embodiment 2

[0038] This embodiment analyzes the pH value of seawater, using the analysis system described in Example 1, the length of the flow cell I on the chip is 20mm. Described analysis method comprises the following steps:

[0039] 1. Preparation of indicator solution

[0040] The m-cresyl violet sodium salt solution is purified by high performance liquid chromatography, and the preparation of the purified solution using the purified cresyl violet sodium salt concentration is a mixed solution of 2mmol / L and NaCl concentration of 0.7mol / L, and is mixed with 1.0mol / L hydrochloric acid The pH of the mixed solution was adjusted to 7.9.

[0041] 2. On-site seawater measurement

[0042] 1) Open the valves 3, 17 and the micro piezoelectric pump 1, close other pump valves, make the filtered seawater sample pass through the seawater pipeline C to clean the chip channel and fill the quantitative channel L1, and the excess seawater flows out from the waste discharge pipeline F . Turn off th...

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Abstract

The invention provides a microfluidic-circulation analysis-based high-precision in-situ seawater pH analysis system and method. The analysis system comprises a microfluidic chip with a circulation mixing structure, a filter head, a seawater pipeline, an indicator bag, an indicator pipeline, a waste discharging pipeline, a highlight while light LED lamp, an optical fiber and a spectrograph. According to the analysis system, the quantified mixing and detection of samples can be finished on the chip by a microfluidic chip technology, so that the instrument size is decreased, the dosage of reagents is reduced, the system integration level is high and the analysis system is suitable for in-situ measurement; the chip has the circulation mixing structure, after seawater and an indicator are quantified through chip channels, the two quantification channels form a closed loop, a piezoelectric pump is used for driving the seawater and the indicator to flow and mix in the loop and then the perfect mixing of the seawater and the indicator in a constant ratio is realized. According to the analysis system and the analysis method, the precision of the measurement system is improved and an operation step of indicator interference correction in a laboratory is omitted, so that manpower and material resources are saved.

Description

technical field [0001] The invention belongs to the field of seawater chemical analysis, and relates to a high-precision in-situ seawater pH analysis system and analysis method based on microfluidic-circulation analysis. Background technique [0002] Obtaining high-precision results of seawater pH is a prerequisite for studying ocean acidification and carbon cycle. The basic principle of photometry is to calculate the pH value of seawater by detecting the absorbance of the mixed solution of seawater and indicator. The measurement precision of this method can reach 0.001, and the structure is simple, no correction is required, and high-precision detection of seawater pH can be realized. [0003] Researchers based on photometry have developed a series of shipborne or in-situ high-precision pH analyzers, but most of them are in the laboratory development stage, and only the SAMI high-precision pH in-situ sensor developed by the University of Montana has been commercialized. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 曹璐马然张述伟程岩褚东志郭翠莲孔祥峰吴宁吴丙伟刘东彦曹煊高杨王昭玉范萍萍吕婧张颖颖张国华刘岩
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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