Description

Methylthymol Blue, Pentasodium Salt, Pure, 96 is a high-purity metallochromic indicator and complexometric titrant. This compound is valued for its sharp color change in the presence of specific metal ions, enabling precise endpoint detection in analytical chemistry. It is primarily required by laboratories and industrial quality control units in sectors such as water treatment, pharmaceuticals, and metallurgy for complexometric titrations, particularly for the determination of calcium, magnesium, and other divalent cations.

Application

• Complexometric Titration Indicator: Primary use as a visual indicator for EDTA titrations of calcium, magnesium, barium, and zinc ions.
• Water Hardness Analysis: Critical for determining total water hardness (Ca²⁺ and Mg²⁺ concentration) in environmental and industrial water testing.
• Pharmaceutical QC Testing: Used in the assay of active pharmaceutical ingredients (APIs) and excipients containing relevant metal ions.
• Metallurgical Analysis: Employed in the quantitative analysis of metal content in ores, alloys, and plating baths.
• Biochemical Research: Serves as a chelating agent and metal ion probe in various biochemical and enzymatic studies.
• Educational & Standard Solutions: Used in academic laboratories for teaching analytical chemistry principles and preparing standardized titrants.

Basic Information

Item	Details
Product Name	Methylthymol Blue, Pentasodium Salt, Pure, 96
CAS No.	4310-80-9
Molecular Formula	C37H40N2Na5O13S
Molecular Weight	844.78 g/mol
Synonyms	Methylthymol Blue pentasodium salt; Methyl Thymol Blue sodium salt; 3,3'-Bis[N,N-bis(carboxymethyl)aminomethyl]thymolsulfonephthalein pentasodium salt; MTB; Methylthymol Blue Na5; Thymolsulfonephthalein complexone; NSC 403319; EINECS 224-319-9
EINECS	224-319-9

Quality Control

Our Methylthymol Blue, Pentasodium Salt is manufactured under strict quality management systems. Each batch is tested to ensure it meets the declared 96% minimum purity specification and is free from significant interfering impurities. A comprehensive Certificate of Analysis (COA) detailing identity (IR), assay (Titration), and purity checks is provided with every shipment to ensure traceability and consistency for your critical analytical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Dark blue to bluish-black powder
Identification (IR)	Conforms to structure
Assay (Titration)	≥ 96.0 %
Loss on Drying	≤ 5.0 %
Absorbance Ratio	Meets internal standard
Solubility (in Water)	Clear, blue solution

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