Cobalt standard solution Pakistan

Cobalt Standard Solution – Specifications

1. Chemical Name:
Cobalt Standard Solution

2. Common Concentrations:

• 1000 mg/L (ppm) Co
• Also available as 10 mg/L, 100 mg/L, 500 mg/L for calibration series

3. Source Compound:

• Typically prepared from high-purity Cobalt(II) Nitrate or Cobalt(II) Chloride
• Purity of starting salt: ≥ 99.9% analytical grade

4. Appearance:

• Clear solution
• Usually pink to light red due to Co²⁺ ions

5. Matrix:

• Diluted in deionized/distilled water
• Often stabilized in dilute nitric acid (≈ 1–2%) to prevent precipitation and maintain solution integrity

6. Density:

• Approximately similar to water (≈ 1.00 g/mL), minor variation depending on acid content

7. pH:

• Typically acidic (pH 1–2), due to stabilizing acid

8. Trace Impurities:

• Very low levels of interfering metals
• Designed to meet spectroscopic calibration purity requirements

9. Intended Use:

• Atomic Absorption Spectroscopy (AAS) calibration
• ICP-OES / ICP-MS calibration
• Environmental water testing
• Laboratory quality control and standard curve preparation

10. Stability:

• High stability when stored properly
• Acidic matrix prevents cobalt hydroxide precipitation

11. Storage Conditions:

• Store at room temperature (15–30°C)
• Keep tightly closed
• Protect from contamination and evaporation

12. Safety Notes:

• Acidic → can cause eye/skin irritation
• Wear gloves, lab coat, and eye protection
• Avoid ingestion and inhalation of mists