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Photometric method based boat-carrying pH and pCO2 measuring device and measuring method

A measuring device, ship-mounted technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as low precision, high power consumption cost, cumbersome and complicated measurement process, save energy and cost, and avoid complex and repetitive manual work The effect of high operation and measurement accuracy

Active Publication Date: 2015-11-18
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The measurement device can solve the problems of low precision of existing measurement technology, tedious and complicated measurement process, and high power consumption cost, and can be widely used in sensors

Method used

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  • Photometric method based boat-carrying pH and pCO2 measuring device and measuring method
  • Photometric method based boat-carrying pH and pCO2 measuring device and measuring method
  • Photometric method based boat-carrying pH and pCO2 measuring device and measuring method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] In this embodiment, the pretreatment device ( figure 1 ) includes a submersible pump 21, a seawater collection pipeline 22, a seawater discharge pipeline 23, a seawater sample tank 24, a filter head 25 and a first constant temperature water tank 26. The first constant temperature water bath 26 stabilizes the seawater temperature at 25.0° C., and the error is controlled at 0.1° C. The seawater collection pipeline and seawater discharge pipeline are latex tubes with an inner diameter of 3.0mm and an outer diameter of 5.0mm. The seawater sampling pipeline connected to the measuring device is made of polytetrafluoroethylene material with an inner diameter of 1.0mm and an outer diameter of The diameter is 2.0mm. The filter head is made of stainless steel or PEEK with a pore size of 1-10μm.

[0092] Measuring device ( figure 2 ) includes a seawater sampling pipeline 1, a first indicator bag 2, a first indicator sampling pipeline 3, a first three-way valve 4, a first peris...

Embodiment 2

[0094] In this example, the pH value of seawater is analyzed, and the analysis device described in Example 1 is used.

[0095] 1. Preparation of indicator solution

[0096]Prepare m-cresyl violet and sodium chloride mixed solution, m-cresyl violet concentration is 2mmol / L, sodium chloride concentration is 0.7mol / L, and the pH value of mixed solution is adjusted with 1.0mol / L hydrochloric acid and sodium hydroxide to about 7.9.

[0097] 2. Measurement of seawater pH

[0098] 21) Thermostat the indicator to 25.0°C. The seawater sample is drawn into the seawater sample tank 24 through the seawater collection pipeline 22 by the submersible pump 21, and the temperature of the seawater sample is kept constant to 25.0° C. by the constant temperature water tank. The air bath incubator 17 keeps the temperature of the measuring device at 25.0°C.

[0099] 22) The filter head 25 is submerged in the seawater sample. In the measuring device, ①② of the first three-way valve 4 is connect...

Embodiment 3

[0114] This embodiment analyzes seawater pCO 2 values, using the analytical device described in Example 1.

[0115] 1. Preparation of indicator solution

[0116] Prepare a mixed solution of bromothymol blue and sodium carbonate, the concentration of bromothymol blue is 20 μmol / L, and the concentration of sodium carbonate is 50 μmol / L.

[0117] 2. Seawater pCO 2 Measurement

[0118] 21) Utilize CO in the laboratory 2 The standard gas is used to calibrate the measuring system to obtain the calibration coefficient.

[0119] 22) Thermostat the indicator to 25.0°C. Use the submersible pump a to draw the seawater sample into the seawater sample tank d through the seawater collection pipeline b, and use the constant temperature water tank to keep the seawater sample at a constant temperature to 25.0°C. The air bath incubator 17 keeps the temperature of the measuring device at 25.0°C.

[0120] 23) The TeflonAF2400 tubing is submerged in seawater samples. First, the first three...

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Abstract

The invention discloses a photometric method based boat-carrying pH and pCO2 measuring device and measuring method. The measuring device comprises a pretreatment apparatus and a measuring apparatus. The pretreatment apparatus comprises a submerged pump, a seawater collecting pipeline, a seawater discharging pipeline, a seawater sample tank, a filter head, and a first thermostatic water bath. The measuring apparatus comprises a seawater sample injection pipeline, an indicator bag, an indicator sample injection pipeline, a three-way valve, a peristaltic pump, a mixer, a Teflon AF2400 pipeline, a flow-through cell, a waste discharging pipeline, a miniature deuterium-tungsten halogen lamp, a spectrometer, an air thermotank, and a second thermostatic water bath. The provided measuring device can be used to measuring seawater pH and pCO2. In the prior art, the measurement on the sea carbonate system is complicated and tedious, the power consumption cost is high, and the provided device can solve the problem. Furthermore, the measuring device uses the photometric method, thus the measurement precision is high, and the measuring device can be widely applied to sensors.

Description

technical field [0001] The invention belongs to the field of marine chemical analysis, and relates to a ship-mounted high-precision seawater pH and PCO based on a photometric method. 2 Measurement systems and analysis methods. technical background [0002] To understand and explore ocean acidification and the ocean carbon cycle, it is necessary to conduct systematic research on the ocean carbonate system. pH, dissolved inorganic carbon (DIC), alkalinity (TA) and partial pressure of carbon dioxide (pCO 2 ) are the four basic parameters of the carbonate system and an important factor in the study of carbon cycle and ocean acidification. From the known two parameters, two other parameters of the carbonate system can be calculated. However, there is currently a lack of long-term observational data that can be used for the study of carbonate systems, whether in hot research areas or near-shore areas. The research on ocean acidification and carbon cycle puts forward higher req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 曹璐马然张述伟褚东志程岩郭翠莲孔祥峰吴宁吴丙伟王昭玉刘东彦吕婧范萍萍高杨张颖颖张颖刘岩
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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