Aqueous Calibration Solution ASTASOL® ANS009

• Category: Certified Reference Material
• Analyte: Calcium (Ca)
• Product code: ANS009
• Primary starting material and purity: CaCO₃ 99.999%

Matrix: 2% HNO₃ (v/v) prepared from sub-boiling distilled HNO₃ (ANALPURE®) and ultrapure demineralized water, filtered through a membrane filter with a pore size of 0.22 µm (resistivity ≥18 MΩ·cm)

Certified concentration value and expanded uncertainty (k = 2) at 20 °C: 1,000 ± 5 mg/L

Specifications

• Batch number: 1050
• Date of manufacture: 29 August 2023
• Shelf life: 5 years from the date of manufacture

Application

For calibration and validation of analytical methods used for the analysis of aqueous solutions, such as atomic spectroscopy (AAS, AFS), molecular absorption spectrometry, and certain electroanalytical methods.

Characterization and traceability

This CRM is certified based on gravimetric preparation, which also ensures direct traceability to the SI unit – kilogram. The certified value, its uncertainty, and traceability were verified by complexometric methods (using SRM NIST 928) or instrumental analytical methods (AAS, AES, ICP-OES) using CRM AN9009(1N) through a short, uninterrupted calibration chain.

Content of trace impurities in the prepared solution

• Maximum 0.5 mg/L (total)

Homogeneity and stability

The calibration solution is homogeneous, and its stability is guaranteed throughout the entire shelf life, provided it is stored under the conditions specified below.

Storage and instructions for use

This CRM must be stored and kept in its original packaging at temperatures between 5 and 30 °C. The manufacturer guarantees the stated shelf life and expiration date only if the material is handled properly.

The solution temperature must be 20 ± 0.5 °C before each use. The date when the bottle was first opened must be recorded on the certificate. The expiration date, which depends on the date of first opening, must also be recorded on both the certificate and the label.

After use, it is recommended to protect the bottle neck with a layer of parafilm. Small residual amounts in the bottle (less than 10% of the original content) should no longer be used. For this reason, especially in the case of dark bottles, it is advisable to record each withdrawn volume, for example directly on the bottle.

Do not pipette directly from the bottle, and do not return any poured-off liquid back into the original packaging (bottle).