Description

Pyrocatechol Violet is a high-purity, triphenylmethane-based organic dye and complexometric indicator. This compound is valued for its distinct colorimetric properties and its ability to form stable, colored complexes with various metal ions. It is an essential analytical reagent for researchers and quality control laboratories in the chemical and pharmaceutical sectors. Its reliable performance makes it a critical component in precise volumetric analysis and metal ion detection protocols.

Application

• Complexometric Titration Indicator: Primarily used as a metallochromic indicator in the EDTA titration of metals like aluminum, bismuth, thorium, and zirconium, providing a sharp color change at the endpoint.
• Spectrophotometric Analysis: Employed in the quantitative determination of trace metal ions (e.g., Al³⁺, Fe³⁺) in water, environmental samples, and industrial process streams.
• Biochemical Research: Utilized in histology and cytology as a staining agent for microscopic examination of tissues and cellular structures.
• Pharmaceutical Testing: Applied in the assay and impurity profiling of active pharmaceutical ingredients (APIs) where metal content must be strictly controlled.
• Industrial Quality Control: Serves as a reagent for monitoring metal ion concentrations in catalysts, plating baths, and high-purity chemical manufacturing.

Basic Information

Product Name	Pyrocatechol Violet
CAS No.	3117-41-7
Molecular Formula	C₁₉H₁₄O₇S
Molecular Weight	386.37 g/mol
Synonyms	Pyrocatechol Violet; Catechol Violet; 3,3',4'-Trihydroxyfuchsome-2"-sulfonic Acid; Pyrocatechin Sulfonphthalein; 4-[3-(3,4-Dihydroxyphenyl)-1-(4-hydroxy-3-sulfophenyl)methylidenecyclohexa-2,5-dien-1-yl]benzene-1,2-diol; CV; PV
EINECS	221-493-7

Quality Control

Our Pyrocatechol Violet is manufactured under a strict quality management system. Each batch is subjected to comprehensive analytical testing, including identity confirmation by FT-IR, purity assessment by HPLC, and loss on drying. We provide a detailed Certificate of Analysis (COA) with every shipment, ensuring traceability and compliance with your internal specifications and general reagent-grade standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from incompatible materials. The product is light-sensitive and should be stored away from light to maintain stability.

Specification

Item	Specification
Appearance	Dark green to brownish-green powder
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95.0%
Loss on Drying	Max. 2.0%
Solubility	Soluble in water and ethanol
Suitability for Titration	Passes test

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