Effects of ultrasonic irradiation and direct heating on the extraction of priority pesticides from marine sediments

Maria I. Pinto, Carlos Vale, Gerhard Sontag, João Paulo da Costa de Noronha

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Priority pesticides (alachlor, aldrin, γ-chlordane, chlorfenvinphos, chlorpyrifos, dieldrin, 4,4′-DDT, 4,4′-DDD, 4,4′-DDE, α-endosulfan, β-endosulfan, endosulfan sulphate, endrin, α-HCH, β-HCH, γ-HCH, δ-HCH, HCB, HCBD, heptachlor, heptachlor epoxide, isodrin, methoxychlor, mirex, quintozene, terbuthylazine and trifluralin) are a group of toxic substances that are known by their persistency in the aquatic environment. Their screening in marine sediments may provide information on the sources and distribution in the water mass of fresh-transitional and coastal waters. This work proposes a rapid and reliable method to extract multi-residues of priority pesticides by ultrasounds irradiation from marine sediments. Multiple variables have been optimised: ultrasound frequency, sonication intensity, signal operation mode, time of extraction and water bath temperature. After sample clean-up and pre-concentration of the pesticides by stir bar sorptive extraction, the compounds were analysed by gas chromatography-mass spectrometry (GC-MS) using the selective ion monitoring acquisition mode (SIM). Better performance was found for ultrasonic-assisted extractions (UAE) at frequency of 35kHz and an output intensity of 60% in a sweep mode of operation. An increase of water bath temperature to 80°C had a significant effect on the extraction of pesticides with high octanol-water partitioning coefficients (Kow). Under optimal conditions, method detection limits (MDLs) and method quantification limits (MQLs) ranged from 0.3 to 4.4ngg−1and from 0.8 to 14ngg−1, respectively. Recoveries between 70 and 111%, at high precision levels, were found at different types of marine sediments with a single extraction cycle. Method performance was in good agreement with quality control guidelines.
Original languageEnglish
Pages (from-to)1638-1659
JournalInternational Journal Of Environmental Analytical Chemistry
Volume93
Issue number15
DOIs
Publication statusPublished - 1 Dec 2013

Fingerprint

Geologic Sediments
marine sediments
Pesticides
HCH (pesticide)
Ultrasonics
Heating
marine sediment
ultrasonics
irradiation
Sediments
HCH
pesticides
pesticide
Aldrin
Irradiation
Endosulfan
endosulfan
heating
heat
Water

Cite this

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title = "Effects of ultrasonic irradiation and direct heating on the extraction of priority pesticides from marine sediments",
abstract = "Priority pesticides (alachlor, aldrin, γ-chlordane, chlorfenvinphos, chlorpyrifos, dieldrin, 4,4′-DDT, 4,4′-DDD, 4,4′-DDE, α-endosulfan, β-endosulfan, endosulfan sulphate, endrin, α-HCH, β-HCH, γ-HCH, δ-HCH, HCB, HCBD, heptachlor, heptachlor epoxide, isodrin, methoxychlor, mirex, quintozene, terbuthylazine and trifluralin) are a group of toxic substances that are known by their persistency in the aquatic environment. Their screening in marine sediments may provide information on the sources and distribution in the water mass of fresh-transitional and coastal waters. This work proposes a rapid and reliable method to extract multi-residues of priority pesticides by ultrasounds irradiation from marine sediments. Multiple variables have been optimised: ultrasound frequency, sonication intensity, signal operation mode, time of extraction and water bath temperature. After sample clean-up and pre-concentration of the pesticides by stir bar sorptive extraction, the compounds were analysed by gas chromatography-mass spectrometry (GC-MS) using the selective ion monitoring acquisition mode (SIM). Better performance was found for ultrasonic-assisted extractions (UAE) at frequency of 35kHz and an output intensity of 60{\%} in a sweep mode of operation. An increase of water bath temperature to 80°C had a significant effect on the extraction of pesticides with high octanol-water partitioning coefficients (Kow). Under optimal conditions, method detection limits (MDLs) and method quantification limits (MQLs) ranged from 0.3 to 4.4ngg−1and from 0.8 to 14ngg−1, respectively. Recoveries between 70 and 111{\%}, at high precision levels, were found at different types of marine sediments with a single extraction cycle. Method performance was in good agreement with quality control guidelines.",
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Effects of ultrasonic irradiation and direct heating on the extraction of priority pesticides from marine sediments. / Pinto, Maria I.; Vale, Carlos; Sontag, Gerhard; Noronha, João Paulo da Costa de.

In: International Journal Of Environmental Analytical Chemistry, Vol. 93, No. 15, 01.12.2013, p. 1638-1659.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of ultrasonic irradiation and direct heating on the extraction of priority pesticides from marine sediments

AU - Pinto, Maria I.

AU - Vale, Carlos

AU - Sontag, Gerhard

AU - Noronha, João Paulo da Costa de

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AB - Priority pesticides (alachlor, aldrin, γ-chlordane, chlorfenvinphos, chlorpyrifos, dieldrin, 4,4′-DDT, 4,4′-DDD, 4,4′-DDE, α-endosulfan, β-endosulfan, endosulfan sulphate, endrin, α-HCH, β-HCH, γ-HCH, δ-HCH, HCB, HCBD, heptachlor, heptachlor epoxide, isodrin, methoxychlor, mirex, quintozene, terbuthylazine and trifluralin) are a group of toxic substances that are known by their persistency in the aquatic environment. Their screening in marine sediments may provide information on the sources and distribution in the water mass of fresh-transitional and coastal waters. This work proposes a rapid and reliable method to extract multi-residues of priority pesticides by ultrasounds irradiation from marine sediments. Multiple variables have been optimised: ultrasound frequency, sonication intensity, signal operation mode, time of extraction and water bath temperature. After sample clean-up and pre-concentration of the pesticides by stir bar sorptive extraction, the compounds were analysed by gas chromatography-mass spectrometry (GC-MS) using the selective ion monitoring acquisition mode (SIM). Better performance was found for ultrasonic-assisted extractions (UAE) at frequency of 35kHz and an output intensity of 60% in a sweep mode of operation. An increase of water bath temperature to 80°C had a significant effect on the extraction of pesticides with high octanol-water partitioning coefficients (Kow). Under optimal conditions, method detection limits (MDLs) and method quantification limits (MQLs) ranged from 0.3 to 4.4ngg−1and from 0.8 to 14ngg−1, respectively. Recoveries between 70 and 111%, at high precision levels, were found at different types of marine sediments with a single extraction cycle. Method performance was in good agreement with quality control guidelines.

KW - ultrasound-assisted extraction (UAE)

KW - gas chromatography-mass spectrometry (GC-MS)

KW - multi-frequency ultrasonic baths

KW - priority pesticides

KW - marine sediments

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M3 - Article

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EP - 1659

JO - International Journal Of Environmental Analytical Chemistry

JF - International Journal Of Environmental Analytical Chemistry

SN - 0306-7319

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