Description

o-Tolidine Dihydrochloride Hydrate 97% is a high-purity, hydrated salt form of the aromatic amine o-tolidine, widely recognized as a critical chromogenic reagent and chemical intermediate. Its primary value lies in its ability to produce a distinct, measurable color change in the presence of specific analytes, making it indispensable for precise detection and quantification. This compound is essential for industrial and research laboratories, particularly in water quality testing, clinical diagnostics, and the synthesis of dyes and pigments.

Application

• Chromogenic Reagent for Chlorine Detection: A key component in test kits and analytical methods for measuring free and total chlorine in drinking water, wastewater, and industrial process water.
• Clinical Diagnostic Assays: Used as a substrate in enzymatic assays (e.g., for peroxidase) and in the development of diagnostic strips for various biomarkers.
• Chemical Synthesis Intermediate: Serves as a precursor in the manufacture of azo dyes, pigments, and other specialty organic compounds.
• Analytical Chemistry Standard: Employed as a reference standard in spectrophotometric and colorimetric analysis for method validation and calibration.
• Research & Development: Utilized in biochemical and environmental research for developing new detection methodologies and sensor technologies.

Basic Information

Product Name	o-Tolidine Dihydrochloride Hydrate 97%
CAS No.	304671-77-0
Molecular Formula	C14H18N2·2HCl·xH2O
Molecular Weight	285.23 (anhydrous basis)
Synonyms	3,3'-Dimethylbenzidine Dihydrochloride Hydrate; o-Tolidine Dihydrochloride; 4,4'-Diamino-3,3'-dimethylbiphenyl Dihydrochloride; 3,3'-Dimethyl-[1,1'-biphenyl]-4,4'-diamine Dihydrochloride; Bianisidine Dihydrochloride; Fast Blue B Base Dihydrochloride; OT Dihydrochloride
EINECS	Contact for details

Quality Control

Our o-Tolidine Dihydrochloride Hydrate 97% is manufactured under strict quality management protocols. Each batch undergoes rigorous analytical testing, including assay, identification, and impurity profiling, to ensure it meets the declared specification and is suitable for its intended analytical and synthetic applications. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	White to light yellow or light beige crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Water Content (KF)	Contact for details
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm

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