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A ph correction method for a multi-parameter water quality profiler

A calibration method, multi-parameter technology, applied in the field of marine science, which can solve the problems of data drift, response lag, etc.

Inactive Publication Date: 2021-09-14
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to its small size, it is very suitable for rapid survey of offshore water, large-scale survey, water quality profile observation, navigation observation, towing body installation observation, buoy long-term observation, seabed long-term monitoring, etc., but the instrument works for a long time or is located in the thermohalocline There may be data drift or response hysteresis when measured at

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  • A ph correction method for a multi-parameter water quality profiler
  • A ph correction method for a multi-parameter water quality profiler
  • A ph correction method for a multi-parameter water quality profiler

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Embodiment Construction

[0028] The invention mainly includes the steps of data acquisition, data quality control, data averaging and data correction. figure 1 A block diagram of the proposed method is given. include:

[0029] 1. Data acquisition: Use a multi-parameter water quality profiler to obtain the pH profile of each station in the observed sea area, and use S to represent it. The pH probe has been calibrated at room temperature using NIST (National Institute of Standards and Technology, USA) standard buffer solutions with pH = 4.01, 7.00 and 9.21 before deployment; during the deployment process, ensure that the side of the deployment ship faces the wind and is uniform Lower it so that the instrument can measure stably. The sampling frequency of the multi-parameter water quality profiler is 6Hz, the measuring range of the pH probe is 1 to 13, and the accuracy is 0.1, which can obtain a richer pH profile;

[0030] 2. Data quality control: In order to eliminate the external interference caused...

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Abstract

The invention relates to a pH correction method of a multi-parameter water quality profiler, which comprises the following steps: data acquisition: using a multi-parameter water quality profiler to obtain the pH profile S of each station in the observed sea area; Temperature data, reverse pressure correction data, calculation of local standard deviation to remove large-amplitude singular values, and other steps to perform quality control on S, and the quality control results are represented by Q; data averaging: perform sliding average on the downlink data of each station in Q, and process the results Represented by A; data correction: based on the pH value of seawater measured by a bench-top pH meter calibrated with a pH standard buffer solution, A is corrected.

Description

technical field [0001] The invention relates to the field of marine science, in particular to a pH correction method for a multi-parameter water quality profiler (abbreviated as RBR). Background technique [0002] pH represents the negative logarithm of the hydrogen ion (H+) concentration of acidic substances in water (pH=log10[H+]), which is an important indicator of the health of the water environment and is of great significance to the survival and reproduction of marine organisms. Regarding the determination of the pH value of seawater, conventional chemical methods mostly use water collectors to collect water samples, and use a desktop pH meter to measure the pH value of seawater. Because the probe of the desktop pH meter is cheap and easy to replace, the measurement results are more accurate, but this method is time-consuming and labor-intensive and can only obtain single-point pH data, which has great limitations. The advent of the multi-parameter water quality profi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/18
CPCG01N33/18
Inventor 孙雪宋贵生刘方方秦钰魏皓
Owner TIANJIN UNIV