Description

Semixylenol Orange is a high-purity metallochromic indicator and complexometric titration reagent, widely recognized for its sharp color change in the presence of metal ions. Its primary value lies in providing precise and reliable endpoint detection in analytical chemistry, particularly for the titration of metals like aluminum, iron, and thorium. This product is essential for laboratories and industrial quality control units in sectors such as chemical manufacturing, pharmaceuticals, and environmental testing where accurate metal ion quantification is critical.

Application

• Complexometric Titrations: Primary use as a visual indicator for the titration of aluminum, iron, thorium, and other metal ions with EDTA.
• Analytical Chemistry: Employed in quantitative analysis for determining metal concentrations in various sample matrices.
• Water Treatment Analysis: Used in testing for heavy metal content in industrial wastewater and process water.
• Pharmaceutical QC: Applied in the analysis of raw materials and finished products for trace metal impurities.
• Research & Development: Serves as a key reagent in metallurgical studies and the development of new analytical methods.
• Educational Laboratories: A standard reagent for teaching complexometric titration techniques in university chemistry courses.

Basic Information

Product Name	Semixylenol Orange
CAS No.	19329-67-0
Molecular Formula	C31H32N2O13S3
Molecular Weight	760.78 g/mol
Synonyms	3,3'-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein; Xylenol Orange, Semi; 3,3'-Bis[bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein; NSC 112204; o-Cresolsulfonphthalein-3,3'-bis(methyliminodiacetic acid); Semixylenol Orange indicator; 3,3'-Bis[bis(2-carboxyethyl)aminomethyl]-o-cresolsulfonphthalein (common representation)
EINECS	242-952-5

Quality Control

Our Semixylenol Orange is manufactured under strict quality management systems to ensure batch-to-batch consistency and high performance. Each lot undergoes comprehensive analytical testing, including identification, purity assay, and impurity profiling. A Certificate of Analysis (COA) detailing all test results 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. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Absorbance (at λ max)	Conforms
Transition Interval (pH)	Conforms to standard
Heavy Metals (as Pb)	≤ 20 ppm

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