[Chemical Knowledge]：effect of carrageenan

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Carrageenan action (Karl Fischer Titration) is an analytical method commonly used to measure moisture content. It is the use of carrageenan (Karl Fischer) reagent for water titration, according to the volume of carrageenan reagent consumed to determine the water content in the sample, also known as coulometric titration. The effect of

carrageenan was first proposed by the German chemist Karl Fischer in 1935, and it has been widely used in quality control in the fields of chemical industry, medicine, food, cosmetics and so on. This method is considered to be a highly accurate, sensitive and reliable test method, which can detect the extremely small amount of moisture in the sample.

carrageenan reagents commonly used in three, they are: carrageenan reagent A, carrageenan reagent B and carrageenan reagent C. Among them, carrageenan reagent A is a reagent containing only iodide, and is suitable for measuring the moisture content of elemental and solvent substances containing 1-5% of moisture. Carrageenan Reagents B and C The addition of imidazole and isothiocyanate to carrageenan reagent A, respectively, makes the reagent selective for specific substances for the determination of specific samples. For example, carrageenan reagent B can be used for samples containing 35% or more of glycerol, ethylene glycol, and propylene glycol, while carrageenan reagent C is suitable for measuring soil samples, certain salicylic acid derivatives, and the like. The principle of

carrageenan action is to use the change in potential at the end of titration to measure moisture content. Carrageenan reagent contains sulfuric acid. According to the strong hydrophilic nature of sulfuric acid, it will absorb water from the tested sample into the reagent, react with imidazole and isothiocyanate in the reagent, and produce a change in potential. The titration end point refers to the potential change point, that is, the iodine ion added in the reagent and the reactant react with each other instantly, resulting in the potential mutation.

carrageenan action has many advantages. First of all, it is a highly accurate analysis method that can detect very small amounts of moisture in the sample, and the error range can be controlled within ± 0.1%. Secondly, carrageenan is a highly sensitive test method, and the time required for titration is usually only a few minutes, so it can speed up the quality control and also enable the staff to understand the moisture content of the sample faster. Finally, the carrageenan reagent has relatively little effect on impurities and other organic matter in the sample, so it can more accurately quantify the moisture content in the sample.

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