Chemical Oxygen Demand Calculator

Chemical Oxygen Demand (COD) Calculator

Calculate COD (mg/L) using titration data (Standard Dichromate Method)

Blank Titration Volume, A (mL) Sample Titration Volume, B (mL) Normality of FAS, N (eq·L⁻¹) Sample Volume, V (mL)

Formula Used:
COD = [(A − B) × N × 8 × 10³] ÷ V
COD unit = mg·L⁻¹

🔬 Introduction

Chemical Oxygen Demand (COD) is a critical water quality parameter used to quantify the amount of oxygen required to chemically oxidize organic and inorganic pollutants in water. 🌊⚗️ A COD Calculator enables rapid estimation of pollution load in wastewater, sewage, industrial effluents, and surface water bodies. It plays a vital role in environmental monitoring, effluent treatment plant (ETP) design, regulatory compliance, and sustainability assessment. Accurate COD analysis supports pollution control, public health protection, and ecosystem preservation. 🌱📊

🌍 Applications of COD in Daily Life

Wastewater treatment plants (STP/ETP) 🏭
Drinking water quality assessment 🚰
Industrial discharge monitoring 🧪
Environmental impact analysis 🌳
Regulatory compliance (CPCB, EPA, WHO) 📜
River, lake, and groundwater pollution studies 🌊

⚠️ Disclaimer

This Chemical Oxygen Demand (COD) Calculator is intended for educational, academic, and preliminary assessment purposes only. 📘🧠 Results generated may vary based on sampling technique, digestion method, reagents, and laboratory conditions. For legal, industrial, or regulatory reporting, COD values must be confirmed through standard laboratory methods (APHA/IS standards). The platform does not assume responsibility for decisions made solely on the basis of calculated results. ⚖️🔍

❓ Frequently Asked Questions (FAQs)

🔹 What is Chemical Oxygen Demand (COD)?

COD measures the oxygen equivalent of organic matter susceptible to oxidation by a strong chemical oxidant.

🔹 Why is COD important in water analysis?

It indicates the pollution strength of wastewater and helps assess treatment efficiency. 🌊

🔹 What is the unit of COD?

COD is expressed in mg/L (milligrams per liter).

🔹 How is COD different from BOD?

COD measures total chemically oxidizable matter, while BOD measures biodegradable organic matter only. ⚗️🧬

🔹 Where is COD commonly used?

In industrial effluents, municipal sewage, rivers, lakes, and environmental audits. 🏭🌍

🔹 Is COD harmful?

High COD indicates severe pollution, leading to oxygen depletion and aquatic life damage. 🐟⚠️

Related Calculators

Combustion Reaction Calculator