Nitric Acid 70% ACS Grade - Low Particle

Product Overview

Nitric Acid 70% ACS Grade - Low Particle is a high-purity, colorless liquid oxidizing agent formulated specifically for analytical and industrial applications requiring minimal particulate contamination. Historically known as Aqua Fortis (HNO3), this product meets strict ACS Reagent Grade specifications. With a 70% w/w concentration, it provides the strong oxidative power necessary for digestion and synthesis while strictly controlling particle count to prevent interference in sensitive instrumentation.

This Low Particle grade is manufactured under controlled conditions to minimize metallic impurities and suspended solids. It is essential for applications such as High-Performance Liquid Chromatography (HPLC) mobile phases, where particulates can damage columns, and semiconductor wet processing, where surface contamination causes defects. Industrial buyers rely on this specific grade for reproducible results in titration-based assays and trace metal analysis.

Key Properties

• Assay (HNO3): 69.0% – 71.0% (Typical 70%)
• Grade: ACS Reagent Grade - Low Particle
• Appearance: Colorless to slightly yellow liquid, free from suspended matter
• Specific Gravity: 1.41 - 1.43 at 20°C
• Residue after Ignition: Max 0.01% (Limit ensures minimal non-volatile impurities)
• Chloride (Cl): Max 0.5 ppm
• Heavy Metals (as Pb): Max 0.2 ppm
• Iron (Fe): Max 0.2 ppm
• Sulfate (SO4): Max 1 ppm

Common Applications

• HPLC & Chromatography: Used as a mobile phase modifier or for system cleaning where low particulate counts are critical to maintain column integrity and baseline stability.
• Semiconductor Etching: Acts as a primary etchant for silicon wafers and cleaning agent for electronics manufacturing, ensuring residue-free surfaces.
• Laboratory Reagent: Standard oxidizer for elemental analysis (ICP-MS/ICP-OES) sample digestion and general wet chemistry.
• Metal Passivation: Used to passivate stainless steel components, removing free iron and promoting the formation of a protective oxide layer.
• Chemical Synthesis: Serves as a nitrating agent in the production of fertilizers, explosives precursors, and organic intermediates.

Safety Precautions

Nitric Acid 70% is a corrosive strong oxidizer and must be handled with strict adherence to safety protocols. It reacts violently with combustible materials, bases, and reducing agents. Personnel must wear acid-resistant gloves, face shields, and impervious protective clothing. Use only in a chemical fume hood or well-ventilated area to avoid inhaling toxic Nitrogen Oxide (NOx) fumes.

Store in a dedicated acid cabinet, segregated from organic solvents, bases, and carbides. Ensure containers are tightly closed and kept cool. In the event of a spill, neutralize carefully according to facility Hazmat protocols before disposal. Refer to the Safety Data Sheet (SDS) for detailed emergency response procedures.

Benefits

ACS Reagent Quality: Meets strict purity standards for research and analytical use.
Low Particulate Specification: Reduces instrument maintenance and increases yield in micro-fabrication.
Versatile Packaging: Available in 1 Liter bottles for lab use up to 55 Gallon drums for production scale.

Related Products

• 10% Diluted Acetic Acid Food Grade
• 10% Vinegar - Concentrated Industrial Strength
• 20% Diluted Acetic Acid Food Grade