The Keen Dissolved Oxygen Test Kit (RMR-2009) is a reliable and easy-to-use chemical titration test kit designed for the precise measurement of Dissolved Oxygen (DO) levels in water. Using a modified Winkler method, this kit accurately determines DO concentration in ppm (mg/L), making it ideal for environmental monitoring, aquaculture, laboratories, and water treatment applications.

This complete dissolved oxygen testing kit includes all necessary reagents and equipment required to perform the analysis. With the ability to conduct approximately 100 tests, it offers a cost-effective and dependable solution for routine water quality monitoring.

Each reagent bottle is pre-prepared and clearly labeled with lot number and expiration date, ensuring traceability, accuracy, and ease of use. The simple drop counting titration method provides fast, accurate, and reliable results even for users with minimal laboratory experience.

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Key Features at a Glance

• Performs approximately 100 Dissolved Oxygen tests

• Measures aqueous Dissolved Oxygen (DO) levels quickly

• Measurement range: 0.5 ppm to 20 ppm

• Resolution: 0.5 ppm per drop

• Tolerance: ±0.5 ppm

• Easy drop counting titration method

• Pre-made reagents for convenient use

• Reagents labeled with expiration date and lot number

• Complete test setup included

• Provides fast, easy, and accurate results

Mechanism of Measurement

The RMR-2009 Dissolved Oxygen Test Kit uses a modified Winkler method, a well-established chemical method for determining oxygen levels in water.

Step 1 – Oxygen Fixation

Manganous ions react with dissolved oxygen in the presence of potassium hydroxide to form manganese oxide precipitate.

Step 2 – Iodine Formation

After acid is added, manganese oxide hydroxide oxidizes iodide ions to iodine. The formulation is designed to prevent nitrate interference and does not use toxic azide compounds.

Step 3 – Titration Reaction

The iodine produced is proportional to the dissolved oxygen concentration and is titrated using thiosulfate solution until the iodine is reduced back to iodide ions.

Chemical Reactions

1. 2Mn²⁺ + O₂ + 4OH⁻ → 2MnO(OH)₂

2. MnO(OH)₂ + 2I⁻ + 4H⁺ → Mn²⁺ + I₂ + 3H₂O

3. I₂ + 2S₂O₃²⁻ → S₄O₆²⁻

Significance of Dissolved Oxygen Testing

The concentration of dissolved oxygen in water is critical to maintaining healthy aquatic ecosystems and efficient water treatment systems. Adequate oxygen levels support aquatic life growth and survival in rivers, lakes, and oceans.

Low oxygen levels can lead to anaerobic decomposition of organic matter, which produces harmful compounds and degrades water quality. In industrial and municipal water systems, maintaining at least 2 mg/L of dissolved oxygen helps prevent pipe corrosion and system damage.

Regular monitoring with the Keen DO Test Kit ensures water quality remains within safe, effective limits.

Applications

The Keen Dissolved Oxygen Test Kit is widely used for:

• Aquaculture and fisheries monitoring

• Fish ponds and biofloc systems

• Drinking water testing

• Environmental water analysis

• Industrial water treatment

• Boiler water monitoring

• Educational and research laboratories

Package Includes

• RMR-2009 Test Kit Box

• 6 Bottles with Pre-prepared Reagents

• Sample Tube

• Sample Collecting Syringe

• Instruction Manual

✔ Accurate, economical, and easy to use, the Keen Dissolved Oxygen Test Kit (100 Tests) is an essential tool for reliable water quality monitoring in laboratories, aquaculture systems, and industrial water applications.