The above chrome black t indicator liquid indicator is stored in the refrigerator in a brown bottle, which is convenient to use. Dissolve triethanolamine, 0.5g chrome black T indicator in 100ml triethanolamine, and replace triethanolamine with up to 25ml ethanol to reduce the viscosity of the solution, because triethanolamine has the basicity of amines and no hardness buffer can be added. When using water, 95% ethanol or glycerol as solvent, 0.5g of chrome black T indicator must be added with 10ml of hardness buffer, then dissolved in water, 95% ethanol or glycerol and diluted to 100ml, instead of being directly dissolved in 95% ethanol and diluted to 100ml according to? 9.1.3.6 of the sanitary standard for drinking water. the color of the samples varies from depth to depth, and the discoloration at the end point is not very obvious, which often causes large errors and brings inconvenience to the analysis work.ДЄccording to the characteristics of stable properties and easy solubility of solid chrome black t indicator in water and ethanol, water, 95% ethanol, glycerol and triethanolamine can be selected as solvents respectively. it is difficult to grasp the dosage when measuring in parallel. The liquid chrome black T indicator is very convenient to use, but its aqueous solution can only be stored for a few days.Д¬hrome black t indicator is a metal ion indicator commonly used in EDTA complexometric titration, especially suitable as an indicator of magnesium, but its aqueous solution has poor stability and is usually used in a solid mixture with KCl or NaCl. The solid chrome black T indicator is very stable and the quantity is not easy to control when used. Practice has proved that the most suitable pH value for chromium black T indicator is between 9.0 and 10.5. The pH value is blue between 6.3 and 11.6.

The pH value is greater than 11.6 and orange. There are three different colors in the solution, and when the pH value is less than 6.3, it is purple. The resulting indicator was verified that the solution was dark purple red with water sample and pure water respectively, and the color of titration end point could not change.Д¬hrome black T indicator is a commonly used metal indicator. When we 2001 and prepared the chrome black T indicator according to the sanitary standard for drinking water, we found that 9.1.3.6 of which only dissolved the chrome black T indicator with 95% ethanol and diluted it to 100ml. Chromium black T indicator is also used as indicator when measuring the total hardness (total amount of calcium and magnesium ions) of water samples. Used for wool, wool and all kinds of wool fabric dyeing, can also be used for nylon dyeingД¬hrome black T indicator, also known as mordant black 11, alias Eilai chrome black T indicator, scientific name 1-(1-hydroxy-2-naphthylazo)-6-nitro-2-naphthol -4-sodium sulfonate is a comprehensive indicator for the determination of barium, cadmium, indium, magnesium, manganese, calcium, lead, scandium, strontium, zinc, zirconium, etc. When dyeing, copper and iron are encountered, and the color light has a greater influence. Its aqueous solution, adding concentrated hydrochloric acid has no big change adding sodium hydroxide concentrated solution to turn brown light magenta. It is dark blue in concentrated sulfuric acid and light reddish brown after dilution it is withered orange in concentrated nitric acid. Soluble in water, and red to paddle red slightly soluble in alcohol, and brownish magenta slightly soluble in acetone. Incompatible with strong oxidizing agents, strong reducing agents.Д¬hemical properties dark brown powder. Sodium 3-hydroxy-4-7-nitro-naphthalene-1-sulfonate Sodium 3-hydroxy-4-7-nitronaphthalene-1-sulfonate Sodium (4Z)-4-7-nitro-3-oxo-3,4-dihydronaphthalene-1-sulfonate Mordant Black 11, monosodium salt (8CI)ДЎ-Naphthalenesulfonic acid, 3-hydroxy-4-7-nitro-, monosodium saltДў-Hydroxy-1-(1-hydroxy-2-naphthylazo)-6-nitro-4-naphthalenesulfonic acid, sodium saltДЈ-Hydroxy-4-(1-hydroxy-2-naphthylazo)-7-nitro-1-naphthalenesulfonic acid, sodium salt

Epichrome vs fluid