info@universallab.org
WhatsApp: +41762172997
Price may vary based on selected options
Delivery time: 1 ~ 2 weeks
Organic Elemental Analysis (OEA), also known as CHNS or CHNS/O analyzer, is a fundamental technique for quantifying the elemental composition of organic materials. It determines the mass percentages of carbon (C), hydrogen (H), nitrogen (N), sulfur (S), and oxygen (O) in a wide variety of sample types. This technique is essential in the characterization of organic compounds, quality control, environmental monitoring, and research applications.
###Principle Organic Elemental Analysis is based on high-temperature combustion of the sample in an oxygen-rich environment, followed by quantitative detection of the resulting gases.
No. The analysis detects total elemental content. To determine the speciation (e.g., nitrate vs. amino nitrogen), other techniques like ion chromatography or XPS may be required.
Oxygen is determined via pyrolysis in an inert atmosphere and measurement of CO or CO₂. It is often analyzed separately from CHNS due to different furnace conditions.
Typically around 0.01% (100 ppm) depending on the instrument and sample type.
Yes. OEA is routinely used to test synthetic polymers, especially in research and material development.
High-purity standards and automated instrument calibration allow excellent precision (typically RSD < 0.3%).
| Element | Content (%) |
|---|---|
| Carbon (C) | 47.22 |
| Hydrogen (H) | 6.11 |
| Nitrogen (N) | 2.53 |
| Sulfur (S) | 0.34 |
| Oxygen (O)* | 43.80 |
*Oxygen calculated by difference (100% – C – H – N – S – ash)
To ensure accurate and reproducible results, please observe the following requirements:
The OEA test includes the following steps:
| Attribute | OEA (CHNS/O) | ICP-OES / ICP-MS | FTIR / NMR |
|---|---|---|---|
| Detection Target | Total C, H, N, S, O in organic compounds | Inorganic/metal elements | Molecular bonds and functional groups |
| Sensitivity | ~0.01% (100 ppm) | ppt–ppm (very high) | Qualitative to semi-quantitative |
| Elemental Coverage | CHNS(O) only | Metals and semi-metals | Organic functional groups |
| Sample Type | Solids, viscous organics | Aqueous solutions mainly | Liquids, solids in solution |
| Quantitative Accuracy | Excellent for total CHNS | Excellent for total metals | Good for structural analysis only |
| Preparation Complexity | Minimal (encapsulation) | Requires digestion or dilution | Depends on solubility |
Organic Elemental Analyzer (OEA), also known as CHNS or CHNS/O analysis, is a fundamental technique for quantifying the elemental composition of organic materials. It determines the mass percentages of carbon (C), hydrogen (H), nitrogen (N), sulfur (S), and oxygen (O) in a wide variety of sample types. This technique is essential in the characterization of organic compounds, quality control, environmental monitoring, and research applications.
