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Analysis of styrene leached from polystyrene cups
using GCMS coupled with Headspace (HS) sampler
Inten.
100 104
75
50 103
78
25 51
44 52 63
58 65 74 85 89 98
0
45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 100.0 105.0 m/z
Figure 4. Mass spectrum of styrene
(x1,000,000)
104.00 (10.00)
7.5 103.00 (10.00)
78.00 (10.00)
5.0
2.5
0.0
2.325 2.350 2.375 2.400 2.425 2.450 2.475 2.500 2.525 min
Figure 5. SIM chromatogram of 50 ppb standard styrene solution
Summary of validation results
Table 2. Validation summary
Sr. No. Compound Name Parameter Concentration in ppb Result
1 Reproducibility (% RSD) 50 % RSD : 1.74 (n=6)
2 Linearity* (R ) 1 – 50 R : 0.9996
2
2
3 LOD LOD : 0.2 ppb
Styrene 1 – 50
4 LOQ LOQ : 1 ppb
S/N ratio : 38 (n=6)
5 Precision at LOQ 1
% RSD : 3.2 (n=6)
* Linearity levels – 1, 2.5, 5, 10, 20 and 50 ppb.
5
