Chromium [ Print | Periodic Table ]
Location: Group 6, Period 4
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: Stable in HCl, HNO3, H2SO4, HF, H3PO4. Avoid basic media. Stable with most metals and inorganic anions in 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 1-5% HNO3 / LDPE container.
Cr Containing Samples (Preparation & Solution): Metal (soluble in HCl); Oxides / Ores (chrome ore/oxides are very difficult to dissolve. The following procedures A - D are commonly used:
A. Fusion with KHSO4 and extraction with hot KCl. The residue fused with Na2CO3 and KClO3, 3:1
Nickel, iron, copper, or silver crucibles should be used for D. Platinum may be used for A, B, and C; Organic Matrices (ash at 450°C followed by one of the fusion methods above or sulfuric / hydrogen peroxide acid digestions may be applicable to non oxide containing samples).
|Atomic Spectroscopic Information: (red text indicates severe at ~ concs.)|
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