4-Aminobenzenesulfonic Acid, 99.5%, for Analysiscas: 121-57-3 Reagent Sulfanilic Acid Aniline-4-Sulfonic Acid

• Customization: Available
• Type: Reagents
• Appearance: Vial Seal
• Model NO.: yh-djbhs
• Grade Standard: Reagent Grade
• Purity: 99%
• Environmental Protection: Yes
• Freight1: Small Quantity Logistics or Air Transport
• Freight2: Pick up
• Freight3: Ocean Freight
• Free Sample: Available
• Belong: Yuhan Chem
• Lead Time: Within 7 Days
• Storagemethod: Sealed Container
• Packaging: Sealed Packaging
• Odor: Odorless
• MOQ: 5g or Smallest Bottle
• Port1: Chongqing
• Storage2: Cool Dry Place
• Stability: Excellent
• Transport Package: Sealed and Refrigerated
• Specification: Customization
• Trademark: Customizable
• Origin: China
• HS Code: 29214200
• Production Capacity: 5000 Groups/Year

Product Description

 

Product Parameters

Item	Information
CAS Number	121-57-3
Chemical Name	4-Aminobenzenesulfonic acid
Synonyms	Sulfanilic acid, Aniline-4-sulfonic acid
Molecular Formula	C6H7NO3S
Molecular Weight	173.19
Purity	99.5%
Physical State	Crystalline Powder
Appearance	White to slightly brown crystalline powder
Melting Point	Decomposes without melting at 288°C
Solubility in Water	Insoluble
Specific Gravity	1.485 at 25°C
NFPA Ratings	Health: 2; Flammability: 1; Reactivity: 0

 

 

 

Product Description

4-Aminobenzenesulfonic acid (also known as sulfanilic acid) is a versatile chemical reagent used in various laboratory and industrial applications due to its unique chemical properties. Here are some of its common uses:

1. Analytical Chemistry

• Titration: Sulfanilic acid is used in titration processes, particularly in the determination of nitrite ions. It reacts with nitrite to form a diazonium salt, which can then be coupled with a suitable dye for colorimetric detection.
• Calibration Standards: High-purity sulfanilic acid is used to prepare calibration standards for quantitative analysis in techniques such as UV-Vis spectroscopy and high-performance liquid chromatography (HPLC).
• Sample Preparation: It is used in the preparation of samples for various analytical techniques, where it helps in the formation of stable complexes or derivatives that can be easily detected.

2. Synthetic Chemistry

• Diazotization Reactions: Sulfanilic acid is a key starting material in diazotization reactions, where it forms diazonium salts. These diazonium salts are widely used in the synthesis of azo dyes and other aromatic compounds.
• Coupling Reactions: The diazonium salts derived from sulfanilic acid can undergo coupling reactions with phenols, anilines, and other aromatic compounds to form azo compounds, which are important in the dye and pharmaceutical industries.

3. Pharmaceutical Applications

• Drug Synthesis: Sulfanilic acid is used as a building block in the synthesis of various pharmaceuticals, particularly those containing aromatic amines and sulfonamide groups.
• Quality Control: In pharmaceutical quality control labs, sulfanilic acid is used as a reference standard for the analysis of related compounds in drug formulations.

4. Dye and Pigment Industry

• Azo Dye Synthesis: Sulfanilic acid is a crucial intermediate in the production of azo dyes. The diazonium salts formed from sulfanilic acid can couple with various aromatic compounds to produce a wide range of azo dyes with different colors and properties.
• Pigment Production: It is also used in the synthesis of certain pigments, where it helps in the formation of stable and vibrant colorants.

5. Research and Development

• Material Science: In research labs, sulfanilic acid is used in the development of new materials, such as functional polymers and nanoparticles, where it can be incorporated into the polymer backbone or used as a surface modifier.
• Biochemical Assays: It is used in biochemical assays for the detection and quantification of nitrite ions, which are important biomarkers in various physiological processes.

Safety Considerations

• Toxicity: Sulfanilic acid is moderately toxic and can cause irritation to the skin, eyes, and respiratory system. It should be handled with care, and proper personal protective equipment (PPE) such as gloves, goggles, and lab coats should be worn.
• Storage: Store in a cool, dry place, away from moisture and incompatible materials. Keep containers tightly closed to prevent moisture absorption.
• Disposal: Dispose of waste in accordance with local regulations. Avoid release into the environment.

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FAQ

Q1: Can I get some samples?
A: Yes, sure. Usually, we can provide free samples for less than 5 kg, but the customer needs to pay for the shipping.

Q2: What is your MOQ?
A: The minimum order quantity varies for different products, with most requiring a minimum of 1 ton. However, we can accommodate smaller quantities, such as 100kg, with a 100% sample charge.

Q3: How to confirm product quality before placing an order?
A: You can obtain free samples of the products, but you need to cover the shipping fee or arrange for the samples to be sent to us by express. Additionally, you can provide us with your product specifications and requirements, and we will manufacture the products accordingly.

Q4: Is there a discount for bulk purchases? How much is the discount?
A: Yes, we offer discounts for bulk purchases. The discount is determined by evaluating factors such as purchase volume, product type, and cooperation period. Generally, the larger the purchase volume, the greater the discount.

Q5: How do I start paying?
A: Payment can be made by wire transfer, Western Union, PayPal, Visa, Mastercard, T/T, Apple Pay, Google Pay, etc.

Q6: What is the shipping time?
A: We ship the products out within 1-3 days and provide a tracking number. Shipping time varies by country.

Q7: What qualifications and certifications does the company have? Such as ISO certification, etc.
 A: Our supply manufacturers hold several authoritative certifications to ensure our products and services meet international standards and industry regulations. This includes the ISO 9001 Quality Management System certification, which indicates we have reached internationally recognized levels in product quality control, production process management, and continuous improvement, providing stable and reliable quality assurance for customers.

Q8: How about the after-sale service of products?
A: After purchasing products from our company, you will be supported by our professional technical team and after-sales team, who will help solve any problems you may encounter.