If the color of extracts was deep, the flow rate decreased, the effluent was not transparent, or color of the solution tended to change, it was indicated that soil samples existed had lots of impurities. Thus, 2 or more chromatographic columns were needed to further clean up the soils. In our study, http://www.selleckchem.com/products/arq-197.html more columns were used if needed, and the solutions were transparent when reconstituted with acetone and methanol. The HPLC graph showed that the peak of BDE-209 could avoid other interference of organic compounds such as PBDEs and PCBs (Figure 4).Figure 4The peak of BDE-209 in QBS.3.3. Quality Assurance and Quality ControlProcedural and spiked blanks were processed for evaluating interferences, contamination, and the accuracy of the experiment process. A recovery test was also performed by adding BDE-209 to the treated soil samples.

Table 2 showed good recovery for the tests. Recovery ranged from 91.1 to 116.1%, and spiked blanks recovery ranged from 91.8 to 102.0%, which satisfied the range required (80�C120%). The BDE-209 concentration was below detection in the procedural blanks.Table 2Procedural, spiked blanks and recovery test of soil samples.3.4. Comparison in Levels of BDE-209High level of BDE-209 was observed in paddy field in Guiyu (368.1ng/g). Table 3 exhibited the BDE-209 concentration in this study and other studies. The concentration of BDE-209 in our study was supposed to be the highest. The result probably resulted from multiple factors. Plants usually have capacity to absorb BDE-209 by roots from soils and uptake it to stem and leaves.

However, lower brominated PBDEs are more liable to be taken up by plants than BDE-209 [34, 35]. BDE-209 was also tended to be photodegradated in natural conditions [13, 14]. Soil is a receptor for both particulate and gaseous atmospheric pollutants. Highly brominated congeners tend to affiliate with particles, so they tend to be scavenged from the air mass than low brominated congeners, and they preferentially deposit in the nearby farmland soils [30]. Above all, the sampling paddy field was short distance from the long-standing disassembling area, which predominantly contributed to the high level of BDE-209 in paddy field. The BDE-209 accumulation rate in soils was larger than the removal rate from soils by plants and photodegradation. Table 3Comparison of BDE-209 concentrations with other studies.

The BDE-209 concentration in burning sites of Longtang and Guiyu towns Dacomitinib was 53.6ng/g and 132.1ng/g, respectively, which was mainly contributed by combusted residues and ash of e-waste. The BDE-209 concentrations were almost the same as the e-waste sites in previous study of Longtang towns, but were lower than the concentration in Guiyu town. 4. ConclusionsThe solvent effect of acetone and methanol was investigated for accurate quantification of BDE-209.