Description

Variamine Blue B Sulfate (=4-Amino-4'-Methoxydiphenylamine Sulfate)[For Iron-Titration] is a high-purity analytical reagent grade chemical primarily used as a redox indicator in complexometric titrations. Its core value lies in providing a sharp, distinct color change at the endpoint for the precise volumetric determination of iron and other metal ions. This compound is essential for analytical laboratories, quality control departments, and research facilities requiring accurate and reliable titration results. The product is supplied with a guaranteed specification to ensure consistent performance in critical analytical applications.

Application

• Primary Application as a Redox Indicator: Specifically formulated for the visual titration of iron (Fe²⁺/Fe³⁺) in aqueous solutions, offering a clear color transition from colorless to blue.
• Complexometric Titrations: Used in the analysis of other transition metals that form complexes with EDTA or similar chelating agents, where a redox-sensitive indicator is required.
• Water and Environmental Analysis: Determination of iron content in water samples, wastewater, and environmental extracts to monitor pollution levels and treatment efficacy.
• Pharmaceutical and Cosmetic QC: Testing for trace metal impurities, particularly iron, in raw materials, active pharmaceutical ingredients (APIs), and final products.
• Geological and Metallurgical Assaying: Quantitative analysis of iron ores, alloys, steels, and other metallurgical samples.
• Food and Beverage Industry: Analysis of iron fortification levels or natural mineral content in foodstuffs and beverages.
• Research and Method Development: Serves as a critical reagent in developing and validating new analytical methods in academic and industrial research settings.
• Educational Laboratories: Used in university and technical college laboratories for teaching quantitative analysis and titration techniques.

Basic Information

Product Name	Variamine Blue B Sulfate (=4-Amino-4'-Methoxydiphenylamine Sulfate)[For Iron-Titration]
CAS No.	3169-21-9
Molecular Formula	C₁₃H₁₆N₂O₅S
Molecular Weight	312.34 g/mol
Synonyms	4-Amino-4'-methoxydiphenylamine sulfate; Variamine Blue B; Variamine Blue B Salt; 4-Methoxy-4'-aminodiphenylamine sulfate; N-(4-Methoxyphenyl)-1,4-phenylenediamine sulfate; C.I. 37240; p-Methoxyphenyl-p-phenylenediamine sulfate; Iron Titration Indicator Variamine Blue B
EINECS	221-647-9

Quality Control

Our Variamine Blue B Sulfate is manufactured under strict quality control protocols to meet the exacting requirements of analytical reagent applications. Each batch is tested to ensure high purity, correct identification, and optimal performance as a titration indicator. Certificates of Analysis (COA) detailing purity, assay, and impurity profiles are provided with every shipment. Our quality system is designed to support compliance with various pharmacopeial and industrial standards for reagents.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Light gray to grayish-blue crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Loss on Drying	≤ 1.0 %
Residue on Ignition (Sulfated Ash)	≤ 0.1 %
Iron (Fe)	≤ 10 ppm
Heavy Metals (as Pb)	≤ 20 ppm
Suitability Test (Titration)	Passes test (sharp endpoint)

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.