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Chromium Expanded View


Location:  Group 6, Period 4
Atomic Weight:  51.9961
Coordination Number:  6
Chemical Form in Solution:  Cr(H2O)63+

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
B. Fusion with NaKSO4 and NaF, 2:1
C. Fusion with magnesia or lime and sodium or potassium carbonates, 4:1
D. Fusion with Na2O2 or NaOH and KNO3 or NaOH and Na2O2.

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 Sulphuric / hydrogen peroxide acid digestions may be applicable to non oxide containing samples).

Atomic Spectroscopic Information:  (red text indicates severe at ~ concs.)
Technique / Line Estimated D.L.* Order Type Interferences
ICP-OES 205.552 nm 0.006/.0008 µg/mL 1 ion Os
ICP-OES 284.325 nm 0.008/.0007 µg/mL 1 ion  
ICP-OES 276.654 nm 0.01/.001 µg/mL 1 ion Cu, Ta, V
ICP-MS 52 amu 40 ppt n/a M- 36S16O, 36Ar16O**
*ICP-OES D.L.'s are given as radial / axial view
**The 50Cr, 53Cr, 54Cr lines suffer from many more potential interferences from Sulphur, chlorine, and argon compounds of oxygen, nitrogen, and carbon.

Chromium (Cr) Standards In Our Store

Product Specifications

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Every Inorganic Ventures CRM is sold in patented TCT packaging giving your product up to 3 years shelf life. Read more...

    • Analyte
    • Range
    • Cr+6
    • 45-900µg/L

Associated Certifications: ISO 17034 | ISO 17025


Only Inorganic Ventures can give you ALL of these.....

Traceable to NIST SRMs
Produced under ISO 17025
Produced under ISO 17034
Assayed by validated wet chemical procedures
Assayed by validated ICP-OES procedures
Trace metallic impurities determined by ICP and ICP-MS

And up to 3 YEARS SHELF LIFE with TCT packaging