Determination of Pesticides in Household Dust by Microwave-Assisted Solid-Phase Microextraction
Date Issued
2008
Date
2008
Author(s)
Chiu, Mei-Hsuan
Abstract
Pesticides residuals are ubiquitous problems in the environment while household dust has been known as a sink for many semivolatile organic compounds such as phthalates (plasticizers), 4-nonylphenol (detergent metabolite), polybrominated diphenyl ethers (flame retardants) and pesticides. Since indoor environment can protect dust from sunlight, rain and biological degradation, pollutants then could be persistent and accumulated in the residential environment. Seeing that the activity of children, they are more vulnerable to the exposure and have more chances to intake pesticides from household dusts. Therefore, there is a need to determine the pesticides contained in household dusts to assess the possible health risks caused from the exposures. Up to now, the analysis of pesticides in dust is solvent and time consuming. The purpose of this research was then to develop a method for the determinations of different pesticides in dusts simultaneously by using microwave assisted headspace solid-phase microextraction (MAE-HS-SPME). Commercial vacuum cleaner was used to collect household dusts while particles with diameter smaller than 150μm were filtered out by stainless mesh. After cleaning by the Soxhlet extraction, the sample with known amounts of pesticides spiked was then put in a vial for the MAE-HS-SPME extraction. Several parameters affecting the SPME extraction efficiency were optimized. The results showed the best suitable fiber coating was 100μm PDMS and the optimum condition of MAE-HS-SPME for extraction of pesticides in dust was 20 minutes at 80℃ by the addition of 1 ml water. After headspace extraction, the sample was then analyzed by gas chromatograph with electron capture detector (GC-ECD). The desorption efficiency was found to be 100% when the desorption time was 5 min under 250℃. The linear range for the analysis was 1.25 ~ 1250 ng/g dust (r=0.99). On the other hand, precisions of the method were 4.08% to 17.02%. Furthermore, compared with tradition extraction methods, the MAE-HS-SPME provides a time saving, easy for operation and solvent-free procedure.
Subjects
Pesticide
dust
SPME
headspace
microwave assisted extraction
SDGs
Type
thesis
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