Table of Contents
The amount of water is determined by subtracting the dry weight from the initial weight, and the moisture content is then calculated as the amount of water divided by the dry weight or total weight, depending on the reporting method.
What are the official methods of moisture content determination?
The primary methods of water content determination include spectroscopic, chemical, conductivity and thermogravimetric analysis. For this technical review, the information will focus on the thermogravimetric method of moisture analysis, and the use of halogen heating as the source of thermal radiation.
Why do we determine moisture content?
Moisture content of the food material is important to consider the food is suitable before the consumption, because moisture content affects the physical, chemical aspects of food which relates with the freshness and stability for the storage of the food for a long period of time and the moisture content determine the.
How do you calculate moisture content by Karl Fischer method?
Abstract. The Karl Fischer (KF) titration is a method of determining the water content of solid, liquid and gaseous samples. It is the technique preferred for use in industrial quality control. In principle it involves the oxidation of sulfur dioxide by iodine, in the presence of water, in a buffered solution.
How do you calculate moisture content in a dry basis?
Dry Basis. Dry basis moisture content (designated Md in the text) is described by the percentage equivalent of the ratio of the weight of water (WW) to the weight of the dry matter (Wd). Note that dry weight moisture content can range from 0 to very large percentages.
What is moisture test?
Moisture meters are used to measure the percentage of water in a given substance. This information can be used to determine if the material is ready for use, unexpectedly wet or dry, or otherwise in need of further inspection. Wood and paper products are very sensitive to their moisture content.
Which of the following methods are used to determine moisture content Mcq?
Beta radiation and gamma radiations are used for moisture determination.
What is the KF reagent?
As shown in Formula (1) below, the Karl Fischer method uses Karl Fischer reagent, which reacts quantitatively and selectively with water, to measure moisture content. Karl Fischer reagent consists of iodine, sulfur dioxide, a base and a solvent, such as alcohol.
What is mean by KF factor?
How do you calculate Karl Fischer factor? The water equivalence factor F is determined according to the formula 0.1566 x w / v in mgs of H2O per ml of reagent, where W is the sodium tartrate weight in mgs, and V is the reagent volume in ml.
What is KF in pharma?
Karl Fischer reagent method of water content determination is widely used in pharmaceuticals and other manufacturing industries. This is most reliable and accurate method for moisture determination. The method to use is the Karl Fischer (KF) moisture analysis.
How do you calculate dry basis from as is basis?
To calculate the protein on a dry matter basis, you remove the water, so 100 g powder – 5.3 g water = 94.7 grams of dry matter. You convert from “as is” to DMB by taking the percentage protein on a DMB basis and dividing by the new percentage of dry product: % protein DMB = as is protein / (1- % water).
What is the moisture ratio?
Moisture ratio is the ratio of the moisture content at any time, t to that of the initial moisture content of the sample. Therefore it has no unit. Drying rate is the rate at which internal moisture evaporates to the surroundings.
How do you convert moisture content on a dry basis to wet basis?
The conversion of percentage moisture on a wet basis to a dry basis is calculated with the formula , where is the moisture content on a dry basis in g /100 g dry matter and is the moisture content on a wet basis, that is, g /100 g total mass.
How do I check the moisture content of wood without a meter?
The Oven Test. The simplest way to check the moisture content of a piece of wood is to weigh a piece of wood, dry it in an oven, then measure it again to see the difference in weights. This is the most accurate way to test MC in wood, but it’s also time-consuming.
Which of the following is most accurate method for determining moisture content?
Oven dry method is the most accurate and simplest method for water content determination.
Which is one of the following method for determining water content?
The oven-drying method is the most accurate method of determining water content.
How does a moisture meter measure moisture content?
Shake the moisture meter up and down vigorously for 5 seconds, then quickly turn it so that the gauge is upwards, give a tap to the body of the moisture meter to ensure that all the contents fall into the cup. Hold the rapid moisture meter downwards, again shake for 5 seconds, then turn it with gauge upwards and tap.
How do you make Karl Fischer reagent?
Preparation of the KF Reagent Prepare a solution by mixing 670 mL of methanol and 170 mL of pyridine. Now, add 125 g of iodine to the solution and cool it. Then, take a 250 mL graduated cylinder and add 100 mL of pyridine to it. Keep the solution in an ice bath.
What electrode is KF titration?
The most advanced KF titration technology uses a double platinum electrode for electrochemical indication of the end point, but visual and photometric indicators are also used.
