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COD refers to the total amount of oxygen required to oxidize organic and inorganic matter in water, while soluble COD specifically measures the amount of oxygen needed to oxidize only the soluble organic matter in a sample. Soluble COD is a subset of total COD and provides a more focused measurement on the readily biodegradable organic compounds in water.
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What is difference between open reflux and closed reflux chemical oxygen demand measurement?
The closed reflux method is more efficient in the oxidation of volatile organic compounds than is the opened reflux method. The reason for this is that the oxidant is in contact with these compounds for a longer time. Besides, the closed method is cheaper as only 2 mL of sample is required, since 5 mL is the total volume of the mixture. This means that the amounts of reagents and sample are reduced by a factor of over 20 compared to the opened reflux method. In addition, this fact makes the method less contaminating and allows for the simultaneous digestion of a great number of samples
What is the difference between BOD and COD?
1. COD or Chemical Oxygen Demand is the total measurement of all chemicals in the water that can be oxidized BOD- Biochemical Oxygen Demand is supposed to measure the amount of food (or organic carbons) that bacteria can oxidize. 2. COD is usually measured and the test is simple and easy to perform with the right equipment and can be done in 2 hours. BOD usually takes 5 days 3. Permissible limit of COD =250 to 500 ppm Permissible limit for BOD = 30 mg/L
Why are chemical fertilisers expensive?
Chemical fertilizers are expensive due to the high cost of production, which involves chemicals and energy-intensive processes. Additionally, their prices can be affected by factors such as transportation costs and market demand.
What is theoretical oxygen demand?
The calculated amount of oxygen required to oxidized a compound to its final oxidation products . The organic matter of sewage is mainly composed of carbohydrats , protein, fats,and products of their decomposition . If the chemical formulaeof the organic matter are called as theoretical oxygen demand can be calculatd.
What is the difference between Analytically pure and chemically pure grades?
Chemical pure grade materials have purity that is suitable for use in general applications. Analytical pure materials have purity that is suitable for use in analytical applications (very sensitive).
Difference between elastic and inelastic demand?
difference between elastic and inelastic demand
What is the difference between a term security and a demand security?
distinguish between a term security and a demand security
What is the difference between demand and exchange?
Demand is to ask for something forcibly. Exchange is to trade.
Difference between a demand schedule and demand curve?
Demand schedule is a tabular representation nd Demand curve is a graphical representation
What is the difference between a demand schedule and a demand curve?
a demand schedule is a table showing the relationship between the price of a good and the quantity demanded , but a demand curve is a graph showing the relationship between the price of a good and the quantity demanded.
What is the difference between demand function and demand schedule?
Demand schedule: a list of demand/price equivalencies. It can best be seen as a table with discrete points. Demand function: a continuous function of price-demand interaction. Main difference: schedule is discrete; function is continuous.
The primary difference between a change in demand and a change in the quantity demanded is?
a change in demand is a movement along the demand curve, and a change in quantity demanded is a shift in the demand curve
What is the difference between supply side gaps and demand side gaps?
Supply is the amount produced and demand is the amount that is wanted.
What is the Difference between decrease in demand and contraction in demand?
if demand falls due to change in price of commodity its terms in Economics as contraction in demand, and if demand falls due to other reasons its term decrease in demand...
What is the difference between Peak and off peak?
peak is when the demand of electric power is very high, and off peak is when the demand is low
What the primary difference between aggregate demand curve and individual demand curve?
aggregate demand curve is the total sum of all the individual demand curves while individual demand curve is the demand made by the single individual.
Difference between Indian and pak rupees?
Because of forex market and demand & supply
