Description

Calmagite is a high-purity metallochromic indicator widely recognized for its critical role in complexometric titrations, particularly for the determination of calcium and magnesium ions. Its primary value lies in providing a sharp, clear color change endpoint, which is essential for accurate and reliable analytical results in quality control and research laboratories. This product is indispensable for professionals in water treatment analysis, pharmaceutical quality assurance, and industrial chemical manufacturing who require precise metal ion quantification.

Application

• Complexometric Titration Indicator: Primary use as a visual endpoint indicator for EDTA titrations of calcium and magnesium in aqueous solutions.
• Water Hardness Analysis: Critical for determining total hardness (Ca²⁺ and Mg²⁺ content) in potable, industrial, and wastewater.
• Pharmaceutical QC Testing: Used in the assay of active pharmaceutical ingredients (APIs) and excipients where calcium or magnesium content must be controlled.
• Food & Beverage Industry: Employed in the analysis of mineral content in dairy products, fortified foods, and beverages.
• Geological & Soil Science: Assists in the quantitative analysis of calcium and magnesium in rock, soil, and fertilizer samples.
• Research & Development: Serves as a key reagent in methodological development and analytical chemistry research within academic and industrial settings.
• Industrial Process Control: Monitors ion concentrations in chemical manufacturing, boiler water treatment, and other industrial processes.

Basic Information

Product Name	Calmagite
CAS No.	3147-14-6
Molecular Formula	C₁₇H₁₄N₂O₅S
Molecular Weight	358.37 g/mol
Synonyms	1-(1-Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid; 3-Hydroxy-4-[(2-hydroxy-5-methylphenyl)azo]-1-naphthalenesulfonic acid; Calmagite indicator; NSC 403319; 1-(1-Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulphonic acid; Azomethine H; Metalphthalein derivative
EINECS	221-567-1

Quality Control

Our Calmagite is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Each lot undergoes comprehensive analytical testing, including identity confirmation by IR spectroscopy and purity assessment by HPLC, to meet the stringent requirements of analytical reagent grades. A detailed Certificate of Analysis (COA) documenting all test results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). The product is light-sensitive (store away from light), and prolonged exposure to air and moisture should be avoided to maintain stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Solubility (in Water)	Clear, red-violet solution
Transition Range (pH)	pH 11.0 - 13.0
Color Change	Red to Blue
Heavy Metals (as Pb)	≤ 20 ppm

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