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Lab Reagents

AAS & ICP Standard Solutions

Single-element AAS and ICP calibration standards at 1,000 mg/L and 10 g/L in dilute nitric or hydrochloric acid, traceable to NIST.
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Atomic spectroscopy depends on a calibration curve, and the curve is only as good as the standard behind it. This sub-category supplies single-element stock solutions for flame and graphite furnace AAS, ICP-OES and ICP-MS. Typical items are Aluminium (Al) ICP Standard Solution 1 gm/L in dilute HNO3, Aluminium AAS standard solution 1000 mg/L in dilute HCl, and Antimony (Sb) ICP Standard Solution 10 gm/L in dilute HCl, each traceable to NIST.

Choosing the right standard is mainly about matrix. Nitric acid suits most metals and avoids chloride interferences in ICP-MS. Hydrochloric acid keeps elements such as antimony, tin and gold stable in solution. Concentration matters too, since 10 g/L stocks allow larger dilution ranges for high-level samples.

Each bottle carries a certified concentration with its uncertainty and the traceability chain on the COA. Store standards tightly closed at room temperature and avoid pipetting directly from the stock bottle. Mixed standards and other elements can be requested through our request for quotation form.

AAS & ICP Standard Solutions: questions buyers ask

Should I choose an HNO3 or HCl matrix for my ICP standard?
Use the matrix that matches your digested samples and keeps the element stable. Most metals are stable in dilute nitric acid, which is also preferred for ICP-MS. Elements that hydrolyse or precipitate in nitric acid, such as antimony, tin and some precious metals, are better kept in hydrochloric acid.
How long is a single-element standard valid after opening?
Unopened bottles carry the expiry date on the label and COA. After opening, evaporation and contamination slowly change the concentration, so many labs set an in-use period of several months and record each opening. Pour off an aliquot for dilution rather than pipetting from the bottle to protect the stock.
What does NIST traceability mean for these solutions?
It means the certified concentration has been established by comparison, through an unbroken chain of measurements, with a reference material from the US National Institute of Standards and Technology. The COA identifies the reference used and states the measurement uncertainty, which supports your method validation and audit records.

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