Description

Xylenol Orange Tetrasodium Salt is a high-purity metallochromic indicator and complexometric reagent essential for analytical chemistry. Its core value lies in providing a sharp, distinct color change for the precise titration of metal ions, particularly zirconium(IV) and other heavy metals. This compound is critically needed by quality control laboratories, research institutions, and industrial facilities involved in water treatment, metallurgy, and pharmaceutical analysis to ensure accurate and reliable quantitative results.

Application

• Complexometric Titrations: Primary use as a visual indicator for the EDTA titration of zirconium(IV), hafnium(IV), and other heavy metal ions in solution.
• Spectrophotometric Analysis: Employed in the development of colorimetric assays for the detection and quantification of trace metals in environmental and industrial samples.
• Research & Development: A key reagent in chemical research for studying metal-ligand interactions, complex formation constants, and reaction mechanisms.
• Water Treatment Monitoring: Used to analyze metal ion concentrations in wastewater and process water to ensure compliance with environmental regulations.
• Pharmaceutical QC: Applied in the testing of raw materials and finished products for heavy metal impurities as per pharmacopeial guidelines.
• Metallurgical Analysis: Facilitates the determination of specific metal contents in ores, alloys, and plating baths.
• Educational Laboratories: A standard teaching tool in university chemistry courses for demonstrating principles of complexometry and analytical techniques.
• Dye Intermediate: Serves as a chemical precursor in the synthesis of specialized dyes and stains.

Basic Information

Product Name	Xylenol Orange Tetrasodium Salt
CAS No.	3618-43-7
Molecular Formula	C31H28N2Na4O13S
Molecular Weight	760.58 g/mol
Synonyms	3,3'-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein Tetrasodium Salt; Xylenol Orange Tetrasodium; XO Tetrasodium Salt; Xylenol Orange, Sodium Salt; Tetrasodium 3,3´-[3H-2,1-Benzoxathiol-3-ylidenebis[(6-hydroxy-5-methyl-3,1-phenylene)methyleneimino(1-carboxy-2-oxo-1,2-ethanediyl)azo]]bis[6-hydroxybenzenesulfonate] S,S-Dioxide; C.I. 43810; Xylenol Orange TS; Xylenol Orange Indicator
EINECS	222-816-3

Quality Control

Our Xylenol Orange Tetrasodium Salt is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for analytical and research applications. Certificates of Analysis (COA) documenting identity, purity, and performance are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and light-sensitive; prolonged exposure to air, moisture, or light may affect its performance and stability.

Specification

Item	Specification
Appearance	Orange-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0 %
Absorbance (λ max)	Conforms
Performance Test	Suitable for complexometric titration
Heavy Metals (as Pb)	≤ 20 ppm

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