Application Note POLYMER003
Introduction
During the incineration of plastics made from naphtha, trace amounts of Cl are a source of toxic gases and must be controlled at the ppm level. The combustion ion chromatography (CIC) method is commonly used for quantitative analysis of Cl, but the pretreatment is complicated and time consuming. The NEX CG II employs polarized EDX optics to quickly and conveniently quantify trace amounts of Cl in liquid form, which has been difficult with ordinary EDX.
Elemental analysis
| Analysis: | Raw material |
| Use: | Quality assurance |
| Analyzed materials: | Naphtha |
| Analysis method: | Calibration method |
Figure 1: Sample preparation
Table 1: Accuracy confirmation results by repeated measurements
(ppm)
| Sample | Standard value | Quantitative value (Average value) | Standard deviation |
| A | 2 | 1.82 | 0.07 |
| B | 10 | 10.14 | 0.1 |
| C | 100 | 100.6 | 0.2 |
Conclusion
A calibration curve for Cl was prepared using a commercially available mineral oil standard sample, and quantitative analysis was performed using NEX CG II. A detection limit of 0.15 ppm for Cl in a 300-second measurement was achieved with a simple pretreatment process that simply involves filling the liquid sample as is. Furthermore, the accuracy was verified through repeated measurements, and stable reproducibility was confirmed over a wide concentration range (Table 1). These results indicate that NEX CG II is capable of rapid and accurate quantitative analysis of trace amounts of Cl.
