4 ENVIRONMENTAL LABORATORY
contaminants, such as PPB and PBDE, as there must be confidence in the levels reported especially when there are health implications associated with the target compounds. As the RoHS limits the exposure of PPBs and PBDEs to no more than 0.1% (by mass), the repeatability of the 0.05µg/mL calibration standard was key to this analysis.
Figure 3 Calibration curve of decabromobiphenyl Conclusion
Optimisation of the SCION GC-MS allowed excellent separation and quantification of polybrominated biphenyls and polybrominated diphenyl ethers, common flame retardants. Using a quantitative SIM method it was possible to identify and quantify twenty components in fifteen minutes, over a concentration range of 0.05µg/mL to 0.45µg/mL. Monitoring these carcinogenic compounds is vital for industries which manufacture electrical and plastic products, in order to reduce the amount released into the environmental during disposal.
Figure 2 Chromatograms of PBBs and PBDEs
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Table 2. Peak identifiers, retention time, RSD% and linear coefficient values
Peak Peak ID -
PBBs Author Contact Details
Ashleigh Mellor, Applications Specialist, SCION Instruments
• Livingston Business Centre, Kirkton South Road,, Livingston, West Lothian EH54 7FA, Scotland, UK
• Tel +44 1506 300 200 • Email:
sales-eu@scioninstruments.com • Web:
www.scioninstruments.com
1 2 3 4 5 6 7 8 9
10 -
11 12 13 14 15 16 17 18 19 20
2-bromobiphenyl
2,5-dobromobiphenyl 2,4,6-tribromobiphenyl
2,2’,5,5’-tetrabromobiphenyl 2,2’,4,5’,6-pentabromobiphenyl 2,2’,4,4’,6,6’-hexabromobiphenyl 2,2’,3,4,4’,5,5’-heptabromobiphenyl Octabromobiphenyl
2,2’,3,3’,4,4’,5,5’,6-nonabiphenyl Decabromobiphenyl PBDE
4-monobromobiphenyl ether 4,4’-dibromodiphenyl ether 3,3’,4-tribromodiphenyl ether 3,3’,4,4’-tetrabromodiphenyl ether 2,2’,4,4’,6-pentabromodiphenyl ether 2,2’,4,4’,5,6’-hexabromodiphenyl ether 2,2’,3,4,4’,5,6;-heptaBDE 2,2’,3,4,4’,5,5’,6’-octaBDE
RT (min) RSD % (RT) RSD% (Area) Linear Coefficient(R2 -
-
3.36 4.23 4.84 6.01 7.01 8.10
11.42 12.80 13.49 14.06
3.77 4.71 5.79 7.54 8.16 9.53
11.91 12.67
2,2’,3,3’,4,4’,5,5’,6-nonbrominated diphenyl ether 13.84 Decabromodiphenyl ether
14.73
0.02 0.01 0.01 0.01
0.006 0.01
0.007 0.006 0.005 0.005 -
0.006 0.03
0.007 0.02 0.01 0.07 0.01 0.07
0.009 0.0082 -
2.4 2.9 2.3 2.6 1.9 2.4 2.7 3.9 2.1 2.1
2.5 2.7 1.4 4.0 1.4 1.7 2.9 4.0 2.9 3.4
-
0.99992 0.99992 0.99963 0.99943 0.99823 0.99782 0.99714 0.99525 0.99829 0.99510 -
0.99958 0.99930 0.99855 0.99724 0.99588 0.99619 0.99957 0.99889 0.99963 0.99903
)
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