Iridium

Location:  Group 9, Period 6
Atomic Weight:  192.22
Coordination Number:  6
Chemical Form in Solution:  IrCl_x^- (x = f [Cl^-])

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, H₂SO₄, and HF aqueous matrices. May cause AgCl precipitation when mixed with Ag⁺. Stable with all other metals.

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

Ir Containing Samples (Preparation & Solution):  Metal (elevated temperature with aqua regia or HCl / Cl₂ {gas} ); Ores (HF / H₂SO₄ digestion followed by aqua regia digestion); Platinum Scrap (aqua regia digestion).