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Eriochrome black T (C.I. 14645) - (Eriochrome black T (C.I. 14645))

Category:

Finished Dosage

CAS NO:

N/A

Standard:

In-house Standards,

Price Range:

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North America,Central/South America,Western Europe,Eastern Europe,Australasia,Asia,Middle East,Africa

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Merck Chemicals (Shanghai) Co., Ltd.

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YES

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Product Description

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Merck Chemicals (Shanghai) Co., Ltd. is the subsidiary of the globally operating group Merck KGaA, Darmstadt (Germany) and provides Chinese market with high quality life science and chemical products and services

The contact persons for the specific product groups of the Chemicals businesses are listed on the website of Merck Group in China.

AI Product Description

*The following content is generated by AI and is for reference only.

Eriochrome Black T (C.I. 14645) is a widely utilized azo dye and metallochromic indicator primarily employed in analytical chemistry for the determination of metal ions, particularly calcium and magnesium. As a key reagent in complexometric titrations, it forms stable, colored complexes with divalent cations such as Ca²⁺ and Mg²⁺. In its free acid form, the indicator exhibits a blue color in alkaline solutions (pH 7–11), while the metal-indicator complex appears wine-red. This distinct color transition allows analysts to accurately detect the endpoint when EDTA is used as the titrant, making it indispensable for water hardness testing and quality control in industrial processes. Beyond water analysis, Eriochrome Black T serves various roles in textile dyeing and biological staining, though its primary significance remains in volumetric analysis. It is often supplied as a sodium salt or mixed with an inert buffer like sodium chloride to enhance stability and solubility. The standard working pH range is critical; if the solution is too acidic, the indicator turns red due to protonation, while excessive alkalinity may cause precipitation of metal hydroxides, interfering with results. Consequently, ammonia-ammonium chloride buffers are frequently added to maintain optimal conditions. Safety precautions are essential when handling this chemical. Although not highly toxic, it can cause skin and eye irritation upon contact. Inhalation of dust should be avoided, and proper personal protective equipment, including gloves and safety goggles, must be worn during preparation and use. Storage should occur in a cool, dry place away from incompatible oxidizing agents to prevent degradation. While generally stable, prolonged exposure to light may alter its color intensity, affecting titration accuracy. Users should dispose of waste containing heavy metal complexes according to local environmental regulations, ensuring that hazardous metal-laden solutions do not enter the sewage system untreated. Its reliability, cost-effectiveness, and clear visual endpoints ensure Eriochrome Black T remains a staple in laboratories worldwide for precise metal ion quantification.