Description

Xylenol Orange is a versatile and highly sensitive metallochromic indicator and complexometric dye, widely recognized for its distinct color change in the presence of metal ions. Its primary value lies in its exceptional chelating properties, making it indispensable for precise analytical titrations and spectrophotometric determinations. This product is essential for professionals in analytical chemistry, water treatment analysis, and industrial process control who require reliable and accurate metal ion detection.

Application

• Complexometric Titrations: Primarily used as a visual indicator for the titration of metal ions like zirconium(IV), thorium(IV), and lanthanides with EDTA.
• Spectrophotometric Analysis: Employed in the quantitative determination of trace metal concentrations in environmental, biological, and industrial samples.
• Water Quality Testing: Applied in laboratories for monitoring hardness ions (calcium, magnesium) and heavy metal contaminants in water.
• Biochemical Research: Utilized as a fluorescent probe and staining agent in cell biology and histology studies.
• Industrial Process Control: Serves as a chelating agent and endpoint indicator in chemical manufacturing and metallurgical processes.
• Dye and Pigment Intermediate: Acts as a precursor or intermediate in the synthesis of specialized dyes and colorants.

Basic Information

Product Name	Xylenol Orange
CAS No.	1611-35-4
Molecular Formula	C31H32N2O13S
Molecular Weight	672.66 g/mol
Synonyms	3,3'-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein; XO; Xylenol Orange tetrasodium salt; o-Cresolsulfonphthalein-3,3'-bis(methyliminodiacetic acid); C.I. 43810; Acid Chrome Blue K; Metalphthalein Orange
EINECS	216-560-1

Quality Control

Our Xylenol Orange is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot is subjected to rigorous analytical testing, including identification, assay, and impurity profiling. A comprehensive Certificate of Analysis (COA) detailing purity, absorbance characteristics, and other critical parameters is provided with every shipment to guarantee compliance with your technical requirements.

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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain stability and performance.

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)	430 - 450 nm (in water)
pH (1% Solution)	2.0 - 4.0
Heavy Metals (as Pb)	≤ 20 ppm

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