Method for Measuring Dissolved Oxygen Content in Oxygen-rich Water

1.Background Introduction

At normal temperature and pressure, the Dissolved Oxygen content in water is generally 6-10 mg/L. In some water bodies, the dissolved oxygen content in the water will increase significantly due to some reasons, leading to rich oxidation in the water body, and the dissolved oxygen content can reach more than 20mg/L. For example, rivers and lakes contain a lot of aquatic plants. When the weather is fine, the oxygen released by the photosynthesis of the aquatic plants will cause the water body to be oxidized; there are also some waters that cause dissolved oxygen in the water due to aeration or pressurized dissolved oxygen measures. The concentration is greatly increased, and common aeration tanks and oxygen-enriched beverages are common.

The Electrode method test process is more simple, convenient and accurate. However, the effective range of the common dissolved oxygen meter on the market at present is mostly 0-20mg/L, and it is incapable of measuring oxygen-rich water with a dissolved oxygen content greater than 20mg/L. After exploration, the technical research and development personnel of REX successfully expanded the effective range of the instrument from the conventional 0~20mg/L to a higher range, thus solving the problem of detecting high dissolved oxygen concentration in an oxygen-rich environment.

2.REX Dissolved Oxygen Meter Test Oxygen Enrichment

(1) Recommended instruments: REX DO-500T dissolved oxygen meter, DO-610L portable dissolved oxygen meter

(2) Recommended electrode: DO-958-Q Dissolved Oxygen Electrode

(3) Reagents: zero oxygen solution, saturated dissolved oxygen solution, etc.

(4) Sample: oxygen-enriched water sample to be tested

(5) The measurement process is as follows:

Electrode prepare---Calibration---Measurement