An Analysis on Using HS GC-MS to Measure Carbon Disulfide in Running Track Particles

Introduction

Carbon disulfide is a neurotoxic and vascular toxin. Acute poisoning manifests as dizziness, headache, and irritation of the eyes and nasal mucosa. Severe poisoning can lead to a short period of excitement followed by delirium, coma, loss of consciousness, and death due to respiratory center paralysis.

The majority of particles used for running tracks are rubber particles. In general, rubber undergoes a sulfurization process during production to transform plastic materials into highly elastic rubber. Carbon disulfide is typically added as an auxiliary agent during this process. After sulfurization, carbon disulfide evaporates due to the high sulfurization temperature. However, if the post-sulfurization treatment of rubber particles is inadequate, there will be carbon disulfide residue in some colloidal particles due to wrapping or adsorption.

Currently, the standard GB 36246-2018 specifies the testing of carbon disulfide in the finished products of sports field surfaces, limiting its maximum emission to no more than 7.0 mg/(m2▪h). However, there are currently no related standards or methods for detecting carbon disulfide in particles. Establishing a detection method for carbon disulfide in particles is of great significance for preventing harmful substances from being introduced into finished products at the source.

Fig.1 Running Track Particles

Fig.1 Running Track Particles

Common methods for detecting carbon disulfide in samples include spectrophotometry, gas chromatography, infrared spectroscopy, and potentiometric titration. In this study, HS GC-MS  will be used to detect carbon disulfide in running track particles, establishing a rapid and environmentally friendly detection method suitable for carbon disulfide in running track particles.

Experiment Section

1.1 Reagents and Instruments

Agilent 7890A-5977B gas chromatography-mass spectrometry (GC-MS) system, equipped with an HP-1 (50 m × 320 μm × 1.05 μm) chromatographic column; Agilent 7697A HS sampler.

1.2 Sample Preparation Method

After sieving, the samples are stored in sealed bags and kept at room temperature.

Optimization of Experimental Conditions

2.1 Solvent Selection

Weighing 2 g of positive particle samples into a 20 ml headspace vial, with an equilibration time of 180 minutes and an equilibration temperature of 130 ℃, comparing the effectiveness of dimethylformamide and dimethylacetamide solvent extraction headspace (HS) with direct headspace (HS) for the response of carbon disulfide. The results showed that direct headspace had better responsiveness and superior extraction efficiency.

2.2 Temperature Selection

Changing the equilibration temperature from 40 ℃ to 130 ℃ (equilibration time at each temperature point is 30 minutes), the experimental results are shown in the figure below. When the extraction temperature reaches 130 ℃, the response of carbon disulfide reaches its peak. Therefore, while not affecting the performance of the headspace vial septum, the extraction temperature is selected as 130 ℃.

Fig.2 Study of Equilibration Temperature

Fig.2 Study of Equilibration Temperature

2.3 Time Selection

Maintaining a fixed equilibration temperature of 130 ℃, the changes in equilibration time ranging from 10 minutes to 300 minutes were studied. The results are shown in Figure 2. When the equilibration time reaches 120 minutes, the response tends to stabilize. Therefore, an equilibration time of 120 minutes is chosen.

Fig.3 The effect of time on the carbon disulfide response

2.4 Linear Curve and Recovery Rate

Preparing a standard working curve for carbon disulfide, with the mass fraction of carbon disulfide as the horizontal axis and the corresponding peak area as the vertical axis, a standard curve is plotted. The results indicate that within the range of 0.01 to 50 μg·g-1, there is a linear relationship between carbon disulfide and its corresponding peak area. The linear regression equation is y=4623108x+13516, with a correlation coefficient of 0.9931, and the method detection limit is 0.001 μg·g-1.

Analysis of Samples

Using the established method, testing was conducted on 5 particle samples, revealing the presence of carbon disulfide in three of the samples, with concentrations of 13.6 mg·kg-1, 35.2 mg·kg-1, and 40.6 mg·kg-1, respectively. The method demonstrates good detection performance on actual samples.

Conclusion

A method for measuring carbon disulfide in running track particles using HS GC-MS has been established. This method is characterized by its simplicity of operation and can be used for rapid detection of carbon disulfide in running track particles.

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