Determination of chlorpropham (CIPC) residues, in the concrete flooring of potato stores, using quantitative (HPLC UV/VIS) and qualitative (GCMS) methods

Douglas, Leisa Antoinette; MacKinnon, Gillian; Duncan, H. J.; Briddon, Adrian; Seamark, Steven

doi:10.1016/j.chemosphere.2017.12.010

Cited by 17 publications

(15 citation statements)

References 19 publications

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“…The length of the core recovered depended on the ease of penetration of the drill into the concrete. Cores were sectioned for depth distribution studies using the cutting procedure and sample processing methodology detailed by Douglas et al (2018). Three cores were collected at measured distances near the plenum (store ventilation system), the front of the store and the back of the store (point of CIPC entry) for both research stores.…”

Section: Sample Collection and Preparation For Cipc Analysismentioning

confidence: 99%

“…The concrete samples were extracted and analysed by HPLC UV/VIS and GCMS as detailed in Douglas et al (2018) with the exception that the HPLC UV/VIS column was washed with acetonitrile (100%) for 30 to 40 min between analyses. The extended wash time ensured that there was no carryover caused by co-extracted residues in the commercial concrete.…”

Section: Cipc Analysis In Concretementioning

confidence: 99%

“…Therefore, information pertaining to the possible route(s) and degree of cross contamination is scant. It has been postulated that cross contamination of grains or seed potatoes may be caused by residual CIPC in the concrete fabric of the stores (Douglas et al 2018) but evidence for the accumulation of residues in concrete is very limited. Boyd and Duncan (1986) employed gas chromatography flame ionisation detection (GC-FID) to determine CIPC and found concentrations ranging from 130 to 290 mg kg −1 in the concrete walls and 2050 to 9470 mg kg −1 in the flooring.…”

Section: Introductionmentioning

confidence: 99%

“…Boyd and Duncan (1986) employed gas chromatography flame ionisation detection (GC-FID) to determine CIPC and found concentrations ranging from 130 to 290 mg kg −1 in the concrete walls and 2050 to 9470 mg kg −1 in the flooring. In a recent study, where CIPC concentrations were quantified in a research potato store, Douglas et al (2018) showed that approximately 90% was retained in the first centimetre of the concrete flooring, with detection up to a depth of 4 cm. The persistence and heterogeneity of CIPC distribution in the concrete flooring of the assessed potato stores was not considered by either Boyd and Duncan (1986) or Douglas et al (2018).…”

Section: Introductionmentioning

confidence: 99%

“…In a recent study, where CIPC concentrations were quantified in a research potato store, Douglas et al (2018) showed that approximately 90% was retained in the first centimetre of the concrete flooring, with detection up to a depth of 4 cm. The persistence and heterogeneity of CIPC distribution in the concrete flooring of the assessed potato stores was not considered by either Boyd and Duncan (1986) or Douglas et al (2018). Therefore, there is a need to explore its distribution and persistence following several years of use, to better understand the current situation.…”

Section: Introductionmentioning

confidence: 99%

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Persistence of Chlorpropham (CIPC) in the Concrete Flooring of Potato Stores

et al. 2018

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The loss of the sprout suppressant, chlorpropham (CIPC), to the fabric of potato stores is currently of concern due to the risk of potential cross contamination of other crops subsequently housed in these stores. HPLC UV/VIS and GCMS methods were successfully employed to detect CIPC in the concrete flooring of research and commercial potato stores with histories of between 1 and 26 years of use. The concentrations in identical research stores, with different numbers of applications, were in the range 0.58-5.7 and 3.4-112 μg g −1, suggesting the magnitude of contamination was influenced by the number of applications. Commercial store A, with a history of 18 seasons of applications (estimate of total CIPC applied 2040 kg), had concentrations varying between 6 and 48 μg g −1 in the top three centimetres, with more than 92% within the top centimetre. In contrast, commercial store B, with a history of less than five seasons of applications (estimate of total CIPC applied 319 kg), had concentrations varying between 0.58 and 304 μg g −1 in the top four centimetres, with less than 47% within the top centimetre. The difference in depth distributions between A and B may be due to the structural integrity of the concrete, which was much poorer in B. CIPC was persistent in all stores irrespective of the total quantities of CIPC applied and date of the final application.

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Section: Sample Collection and Preparation For Cipc Analysismentioning

confidence: 99%

Section: Cipc Analysis In Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Persistence of Chlorpropham (CIPC) in the Concrete Flooring of Potato Stores

et al. 2018

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Occurrence, human health, and ecotoxicological risk assessment of pesticides in surface waters of the River Nile’s Rosetta Branch, Egypt

Eissa

Al-Sisi

Ghanem

2021

Environ Sci Pollut Res

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In Egypt, the shortage of freshwater resources and their pollution constitutes a growing concern. Therefore, the objectives of this study were to (i) monitor the occurrence and spatiotemporal variations of 100 pesticides in surface water samples collected monthly (from July 2018 to June 2019) from El-Rahawy, Sabal, and Tala sampling sites along the Rosetta branch of the River Nile in Egypt, (ii) identify potential noncarcinogenic health risks for the local people through the lifetime consumption of contaminated drinking water, and (iii) perform an ecological risk assessment of aquatic organisms upon exposure to pesticides detected in surface waters based on the risk quotients (RQs) method. Of the 100 pesticides analyzed, 22 belonging to 11 chemical families were detected, and 75.5% of surface water samples were contaminated with one or more pesticide residues. The most frequently detected pesticide was malathion (57%), followed by chlorpyrifos (54%), atrazine (23%), and carbendazim (20%). Spatial distribution showed that the El-Rahawy site had the highest pesticide load (38.47 µg/L), and Sabal had the lowest (16.29 µg/L). Temporal variations revealed that the highest total pesticide concentrations were detected in summer (27.98 µg/L) compared to spring (23.16 µg/L), winter (19.18 µg/L), and autumn (11.85 µg/L). For non-carcinogenic risks of pesticides detected in surface water, the target hazard quotient (THQ) values were less than one. This implies that there is no potential human risk from exposure to drinking water at the sites under study. However, 13 pesticides presented high-risk quotients (RQ > 1), posing potential ecological risks to aquatic organisms.

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