Description

Xylenol Orange Sodium Salt is a high-purity, water-soluble metallochromic indicator widely used in analytical chemistry. Its core value lies in its exceptional selectivity and vivid color change when chelating with specific metal ions, enabling precise endpoint detection in complexometric titrations. This product is essential for quality control laboratories, research institutions, and industrial facilities involved in water analysis, pharmaceutical testing, and metallurgical processes. We ensure a reliable supply of this critical reagent with consistent performance and batch-to-batch uniformity.

Application

• Complexometric Titrations: Primary use as a visual and photometric indicator for the titration of metals like zirconium(IV), thorium(IV), and bismuth(III) with EDTA.
• Spectrophotometric Analysis: Employed in the quantitative determination of trace metal ions in environmental water samples and industrial effluents.
• Biochemical Research: Used as a fluorescent probe for studying calcium and other divalent cation dynamics in cellular systems.
• Pharmaceutical Quality Control: Applied in the assay of metal-containing active pharmaceutical ingredients (APIs) and excipients.
• Geological & Metallurgical Assaying: Facilitates the analysis of ore samples and metal alloys for specific elemental content.
• Dye & Staining Applications: Serves as a histological stain for metal localization in tissue samples.

Basic Information

Product Name	Xylenol Orange Sodium Salt
CAS No.	63721-83-5
Molecular Formula	C31H27N2Na3O13S
Molecular Weight	760.58 g/mol
Synonyms	3,3'-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein Sodium Salt; Xylenol Orange Tetrasodium Salt; XO; Xylenol Orange; o-Cresolsulfonphthalein-3,3'-bis(methyliminodiacetic acid) Sodium Salt; 3,3'-Bis[bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein Sodium Salt; NSC 32425
EINECS	264-447-8

Quality Control

Our Xylenol Orange Sodium Salt is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity, spectrophotometry for molar absorptivity verification, and titration for functional performance. A comprehensive Certificate of Analysis (COA) detailing identity, purity, assay, and physical properties is provided with every shipment to ensure compliance with your laboratory's standards.

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). This product is hygroscopic (moisture-sensitive); keep the container tightly sealed in a dry environment to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Dark red to brownish-red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0 %
Absorbance Ratio (A433nm/A560nm)	1.5 - 2.0 (in water)
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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