Nitric acid is widely used in trace-element laboratories for sample digestion, preservation, matrix matching and preparation of standards for inductively coupled plasma mass spectrometry. At low detection limits, the acid is not merely a reagent: it becomes part of the analytical blank. A nominal assay such as 68 percent does not demonstrate suitability because sub-microgram contaminants can dominate results. Laboratories should qualify each grade and lot against the target analytes, method blank, container system and instrument configuration. This guide focuses on procurement and quality control. Analysts must follow validated methods, fume-hood requirements, closed-vessel ratings and instrument-manufacturer guidance for the specific matrix.
For B2B implementation, assign purchasing, production, quality, engineering and EHS ownership before the first delivery. Approve receiving tests, sampling tools, storage, transfer, deviation response and retained-sample period in writing. During qualification, compare several representative acid lots under the same operating conditions and record mass balance, product quality, waste load and equipment observations. This control plan helps separate raw-material variation from operating or analytical changes and provides objective evidence for buyer-supplier investigations. Review transportation, package integrity and unloading alongside laboratory results because contamination can enter after the supplier’s final test. Define who can approve a deviation, what evidence is required before release and which changes trigger requalification. Review complaint response, shelf-life evidence, emergency contacts and delivery scheduling during the same approval. Close each trial with an authorized report, an updated specification, assigned follow-up actions and a clear decision on routine monitoring.
Define purity by the analytical objective
List target elements, reporting limits and maximum blank contribution. Request lot data for relevant metals rather than relying on a broad “high purity” label. Consider whether semiconductor, trace-metal or another grade is appropriate for the method.
Separate assay from trace-metal quality
Acid concentration establishes dilution and digestion calculations, while element-specific contamination controls the blank. Both must be specified. An acid can meet concentration yet fail a low-level lead, iron or sodium method.
Qualify lots using blanks and controls
Run reagent blanks, digestion blanks and container blanks under the complete preparation sequence. Compare a candidate lot with the incumbent lot and certified reference material. Record instrument background, recoveries and detection capability before approval.
Use containers as part of the system
Bottle material, closure, cleaning, storage time and dispensing can introduce or adsorb analytes. Validate acid in the actual vessels and pipetting workflow. Avoid repeatedly opening a large stock bottle in a busy laboratory.
Match acid use to sample preparation
Matrices differ in their response to nitric acid alone or an approved multi-reagent digestion. Do not improvise reagent combinations. Closed-vessel microwave work requires validated mass, pressure, temperature and cooling limits from the method and equipment supplier.
Use authoritative analytical evidence
A NIST ICP-MS publication describes closed-vessel digestion using diluted nitric acid with hydrogen peroxide for a defined fuel matrix. It demonstrates the role of acid in preparation but does not create a universal digestion method.
Control dilution water and laboratory environment
Ultrapure water, clean-room class, laminar-flow work, gloves and labware can matter as much as acid grade. Trend blank results by analyst, bottle and preparation batch to locate contamination sources.
Protect standards and calibration
Matrix-match standards and samples where the validated method requires it. Track acid concentration after dilution and use compatible certified standards. Review spectral and nonspectral interferences rather than assuming extra acid improves every result.
Specify packaging and change control
Request original sealed bottles, lot traceability, expiry or retest guidance, storage conditions and a lot-specific impurity certificate. Define notification for manufacturing-site, purification or bottle changes.
Prepare a laboratory-grade RFQ
State concentration, required element limits, package size, annual consumption, destination, COA, SDS and sample request. Review the Hiacid nitric acid product information and supply page, then ask whether a suitable documented grade is available.
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Frequently asked questions
Is reagent-grade nitric acid always suitable for ICP-MS?
No. Suitability depends on target elements, reporting limits, blanks and the validated method.
Why run a container blank?
It separates contamination from bottles, caps and cleaning from contamination in the acid itself.
Should every digestion use hydrogen peroxide?
No. Reagent combinations and quantities must come from a validated method for the specific matrix and vessel.
What evidence should qualify a new lot?
Use lot impurity data plus blanks, controls, recoveries and comparison with the approved incumbent lot.