Magnesium

Location:  Group 2, Period 3
Atomic Weight:  24.305
Coordination Number:  6
Chemical Form in Solution:  Mg(H₂O)₆⁺²

^{Intended Use: For the calibration of analytical instruments and validation of analytical methods as appropriate.}

Storage & Handling:  Keep tightly sealed when not in use. Store and use at 20 ± 4°C. Do not pipet from container. Do not return portions removed for pipetting to container.

Chemical Compatibility:  Soluble in HCl, HNO₃ and H₂SO₄. Avoid HF, H₃PO₄, and neutral to basic media. Stable with most metals and inorganic anions forming insoluble silicates, carbonates, hydroxides, oxides, and tungstates in neutral and slightly acidic media.

Stability:  2-100 ppb levels stable for months in 1% HNO₃ / LDPE container. 1-10,000 ppm solutions chemically stable for years in 1-10% HNO₃ / LDPE container.

Mg Containing Samples (Preparation & Solution):  Metal (best dissolved in diluted HNO₃); Oxide (readily soluble in above compatible aqueous acidic solutions); Ores (carbonate fusion in Pt⁰ followed by HCl dissolution); Organic Matrices (Sulphuric / peroxide digestion or nitric / Sulphuric / perchloric acid decomposition, or dry ash and dissolution in dilute HCl. Do not heat when dissolving to avoid precipitation of SiO₂).