https://jopr.mpob.gov.my Wed, 17 Nov 2021 07:28:04 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://jopr.mpob.gov.my/determination-of-chlorpyrifos-in-refined-palm-olein-by-gc-fpd-and-gc-ecd/ Sat, 13 Nov 2021 15:39:07 +0000 https://jopr.mpob.gov.my/V2/?p=9341 Chlorpyrifos (a pesticide containing phosphorous and chlorine) from oil matrix was determined using gas chromatography (GC) with a flame photometric (FPD) and electron capture (ECD) detectors. In the first experiment, the detector (FPD) used gave recoveries (from palm olein samples spiked with chlorpyrifos at levels of 0.04-0.10 μg ml^-1) ranging from 89% to 100% with coefficients of variation from 2.9% to 10.8%. In the second experiment, ECD showed recoveries (from palm olein spiked with chlorpyrifos at levels 0.02-0.10  μg ml^-1) of greater than 97% with coefficients of variations ranging from 0.5% to 2%. The results showed that using GC, the ECD and FPD are suitable detectors for quantification of chlorpyrifos in oil matrix.

]]> https://jopr.mpob.gov.my/downward-movement-of-chlorpyrifos-in-the-soil-of-an-oil-palm-plantation-in-sepang-selangor-malaysia/ Sat, 13 Nov 2021 15:31:55 +0000 https://jopr.mpob.gov.my/V2/?p=9313 A study on the leaching of chlorpyrifos in an oil palm agro ecosystem was conducted in an oil palm plantation in Sepang, Selangor. The insecticide chlorpyrifos was sprayed using a knapsack sprayer at the recommended and double the recommended dosage. Soil samples were collected at different depths, viz. 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and 40-50 cm at the following inter vals: -1 day (before treatment), 0 day (day of treatment, 6 hr later), 1 day, 3, 7, 14, 30 and 60 days after treatment. Recovery of chlorpyrifos from the soil spiked with chlorpyrifos at 4-50 μg kg^-1 ranged from 88%-99% with the coefficients of variation r anging from 2.0% to 7.5%. Chlorpyrifos residue was detected at 0-10 cm and 10-20 cm depths when applied at the recommended and double the recommended dosages, respectively. The residue was only detected in the soil for up to five and seven days after treatment, respectively, when applied at the recommended and double the recommended dosages.

]]> https://jopr.mpob.gov.my/an-improved-method-for-the-determination-of-chlorphyrifos-in-palm-oil-matrices-using-gas-chromatography/ Sat, 13 Nov 2021 08:03:40 +0000 https://jopr.mpob.gov.my/V2/?p=9036 The objective of this study was to improve the method for determining chlorpyrifos, an organophosphorus insecticide, in various palm oil matrices. Chlorpyrifos was separated from the oil matrices using acetonitrile extraction and then subjected to the solid phase extraction (SPE) clean-up process. A silica-based SPE was used for the clean-up process. Quantification of the extracted chlorpyrifos was carried out using a gas chromatograph (GC) equipped with an electron capture detector (ECD). The GC detector response was tested using standard solutions containing 0.005 to 0.12 mg ml^-1 of chlorpyrifos. The retention time for chlorpyrifos was 4.8 min with the minimum detection limit at 0.005 mg ml^-1. The average recoveries of chlorpyrifos from crude palm oil (CPO) spiked with 0.02, 0.04, 0.06, 0.08 and 0.1 mg ml^-1 chlorpyrifos were 94 ± 2.3%, 93 ± 1.4%, 99 ± 1.6%, 97 ± 2.9% and 95 ± 0.7%, respectively. In the case of crude palm kernel oil (CPKO) and refined, bleached, deodorised palm olein (RBDPOo), the recovery of chlorpyrifos from the spiked oil samples containing 0.02 to 0.1 mg ml^-1 of chlorpyrifos ranged from 100% to 101% and from 93% to 99%, with the coefficient of variation ranging from 1.3% to 3.0% and from 0.7% to 2.9%, respectively. The method developed was used to determine the chlorpyrifos content in samples of CPO, CPKO and RBDPOo from mills and a refinery in Selangor, Malaysia. No chlorpyrifos residue was detected in any of the CPO, CPKO and RBDPOo samples collected.

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