Carbon

Location:  Group 14, Period 2
Atomic Weight:  12.011
Coordination Number:  4
Chemical Form in Solution:  (Carbon standard is made using Tartaric Acid)

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:  Moderately soluble in HCl, HNO₃, H₂SO₄, and HF aqueous matrices and very soluble in NH₄OH. Stable with all metals and inorganic anions at low to moderate ppm levels. Do not dilute or store Carbon standards using plastic containers or similar devices.

Stability:  2-100 ppb level stability unknown. 1000-10,000 ppm level stable for years in dilute acidic media in a glass container.

C Containing Samples (Preparation & Solution):  elemental amorphic or graphitic carbon (Oxidative closed vessel fusion such as a Na₂O₂ fusion in a sealed Ni⁰ crucible / Parr bomb); H₂CO₃ (water soluble); Organic Compounds (water solubility is best if possible, or perform a Na₂O₂ fusion in a sealed Ni⁰ crucible / Parr bomb).