NITRIC ACID ANALPURE®

Significance of the topic

The high purity of nitric acid is critical for applications in trace analysis, semiconductor manufacturing, and quality control in chemical industries. Ensuring minimal inorganic contaminants and precise acid concentration protects sensitive analytical workflows and prevents interference in downstream processes.

Objectives and overview

This Certificate of Analysis describes the quality parameters of the product “Nitric Acid ANALPURE®” (Code: SAc0061, Batch: 3107) released on 08 June 2023. The main goals are to verify the acid concentration (assay), assess general contaminants (chloride, sulfur, phosphorus) and quantify trace metals to ppb levels, demonstrating compliance with stringent purity specifications.

Methodology

Quality evaluation relied on standardized chemical tests for assay and major anions, while trace metal content was determined by ultra–trace analytical techniques capable of detecting elements at sub–ppm and sub–ppb levels. Specific techniques may include titrimetric assay for concentration and high–sensitivity spectrometry for impurity profiling.

Main results and discussion

The product showed an assay of 69% nitric acid. Key impurity levels were below specification limits: chloride < 0.2 ppm, total sulfur < 0.3 ppm, total phosphorus < 0.01 ppm. All 54 monitored trace elements were below their maximum allowable concentrations, with actual values typically < 0.1 ppb for most analytes. These results confirm extremely low metal contamination across alkali, alkaline earth, transition and rare earth elements, ensuring suitability for ultra–clean applications.

Benefits and practical applications

• Reliable reagent for trace metal analysis and environmental monitoring, preventing background contamination.
• Suitable for wafer etching and semiconductor processes requiring acid of the highest purity.
• Applicable in pharmaceutical and biotechnology laboratories where analytical accuracy is paramount.

Future trends and possibilities

As analytical demands push toward even lower detection limits, nitric acid purity standards will evolve further. Emerging applications in nanotechnology and advanced materials will drive development of ultra–high–purity reagents. Coupling acid production with in-line real-time impurity monitoring via novel sensor technologies may enhance batch validation efficiency.

Conclusion

The analyzed batch of Nitric Acid ANALPURE® meets rigorous purity criteria, with a precise assay and exceptionally low levels of both major contaminants and trace metals. This profile underpins its use in critical analytical and industrial processes, ensuring minimal interference and high reliability.