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Why cod higher than bod?
A COD test measures all of the chemicals in a sample which can be oxidized. A BOD5 test measures the total amount of food (or organic carbons) that bacteria can oxidize (in 5 days).A COD test result (that can be performed in about 2 hours) can be correlated to an expected BOD5 result (which takes 5 days).by rislys
How to calculate BOD value in a sample?
if unseeded, BOD = (D1-D2)/Pif seeded, BOD = ((D1-D2)-(B1-B2)f)/PD1 = DO of diluted seeded wastewaterD2 = DO of wastewater after incubationB1 = DO of diluted seed sampleB2 = DO of seed sample after incubationf = ratio of seed volume in seeded wastewater test to seed volume in BOD test on seedP = decimal fraction of wastewater sample used. (vol. of wastewater)/(vol. of dilution water plus wastewater)Maybe that helps
How will you test the presence of protein in milk?
You can test the presence of protein in milk using the Biuret test. This test involves adding Biuret reagent to the milk sample, which reacts with proteins to give a purple color change. The intensity of the color change is proportional to the protein concentration in the milk sample.
How to test a seed?
how to test a seed for what?
What is ammonium molybdate test?
The ammonium molybdate test is a qualitative analytical test used to detect the presence of phosphate ions in a sample. It involves adding ammonium molybdate reagent to the sample, resulting in the formation of a yellow precipitate if phosphate ions are present. The intensity of the yellow color can provide an indication of the concentration of phosphate ions in the sample.
Why you use BOD5?
BOD tests the amount of oxygen that is used up in a sample due to organic matter (bacteria). The results tell us the quality of organic matter the sample. 5 days is the best time because after five days some of the bacteria changes and becomes nitrifying (feeds off nitrogen instead of oxygen). It's almost always used to test wastewater.
What is a chemical test for protein?
A common chemical test for proteins is the Biuret test. This test involves adding a solution of copper sulfate and sodium hydroxide to the protein sample, resulting in a color change from blue to purple if proteins are present. The intensity of the purple color can provide an estimate of the protein concentration in the sample.
What is an Anthrone test?
The Anthrone test is a chemical test used to detect the presence of carbohydrates, specifically monosaccharides and disaccharides, in a sample. It involves adding Anthrone reagent to a sample, which produces a blue color in the presence of carbohydrates. The intensity of the blue color can be used to estimate the concentration of carbohydrates in the sample.
What is the test for lipids in foods?
One common test for lipids in foods is the Sudan III test. This test involves adding Sudan III dye to a food sample - if lipids are present, the dye will bind to them and turn the sample a red color. Another method is the iodine test, where iodine reacts with lipids in food and changes color from brown to purple if lipids are present.
Why using phosphate buffer and magnesium sulphate and calcium chloride and ferric chloride for dilution water in BOD5 test?
Phosphate buffer helps maintain the pH of the dilution water, which is crucial for proper bacterial activity in the BOD5 test. Magnesium sulfate, calcium chloride, and ferric chloride provide essential nutrients for the bacteria to thrive and efficiently break down organic matter during the test. These chemicals help create an environment that supports the growth and metabolic activity of the microorganisms responsible for oxygen consumption in the BOD5 test.
What is the regent used to test for sugars?
The Benedict's test is commonly used to test for the presence of reducing sugars in a sample. It involves adding Benedict's reagent (a solution of copper sulfate, sodium carbonate, and sodium citrate) to the sample and heating it. A color change from blue to green, yellow, orange, or red indicates the presence of reducing sugars.
What is the test used for identifying lipids?
One common test for identifying lipids is the Sudan III test. This test involves adding Sudan III dye to a sample, and if lipids are present, the dye will bind to the lipids and turn the sample red. This test is simple and used in labs to detect the presence of lipids in various substances.
