A new extractive spectrophotometric method using malonyl dihydrazide for the determination of organophosphorus pesticides in surface residues

Raju, Jaishree; Gupta, V. K.

doi:10.1016/0026-265x(89)90026-x

Cited by 13 publications

(3 citation statements)

References 9 publications

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“…Due to its wide use and toxicity, several methods like liquid chromatography, mass spectrophotometry, titrimetry [4], voltammetry [5], gas chromatography [6], HPLC [7] and spectrophotometry [8,9] have been reported in the literature for the determination of organophosphates.…”

Section: Introductıonmentioning

confidence: 99%

Ligand exchange based paraoxon imprınted QCM sensor

Özkütük

Di̇ltemi̇z

Özalp

et al. 2013

Materials Science and Engineering: C

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Section: Introductıonmentioning

confidence: 99%

Ligand exchange based paraoxon imprınted QCM sensor

Özkütük

Di̇ltemi̇z

Özalp

et al. 2013

Materials Science and Engineering: C

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“…Most of the methods involve the determination of organophosphorus pesticides by total phosphorous measurements based on the formation of molybdenum blue using various reducing agents. [17][18][19] Others are based on the oxidation of pesticide and determination of unconsumed oxidant by bleaching of dye. 20 Some of the methods suffer from interference, poor sensitivity, instability of color or involve extraction whereas other suffers from blank absorption or longer time required for the color development.…”

Section: Introductionmentioning

confidence: 99%

A catalytic kinetic spectrophotometric determination of organophosphorus pesticides in vegetable samples

Tiwari¹,

Asthana²

2012

J. Braz. Chem. Soc.

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Um método cinético catalítico espectrofotométrico, simples, seletivo e sensível para a determinação de quantidade traço de pesticidas organofosforados foi proposto. O método é baseado no efeito catalítico de pesticidas organofosforados (malationa, dimetoato e forato) na oxidação de LCV (leuco cristal violeta) por iodato de potássio em meio de ácido clorídrico, produzindo um corante violeta. O corante apresenta absorção máxima em 592 nm. O método de tempo fixo foi usado por 15 min. O sistema obedece a lei de Beer no intervalo de 0,02-0,2, 0,032-0,32 e 0,03-0,3 µg mL -1 , para malationa, dimetoato e forato, respectivamente. Parâmetros analíticos importantes como tempo, temperatura, concentração do reagente, acidez, etc, foram otimizados para reação completa. A sensibilidade de Sandell e absortividade molar para o sistema foram 0,0002, 0,0004, 0,0004 µg cm -2 e 1,2 × 10 6 , 5,21 × 10 5 , 6,3 × 10 5 L mol -1 cm -1 , respectivamente. O método proposto foi aplicado satisfatoriamente à determinação de pesticidas organofosforados, em micro concentrações, em amostras vegetais.A simple selective and sensitive catalytic kinetic spectrophotometric method for the determination of trace amount of organophosphorus pesticides has been proposed. The method is based on the catalytic effect of organophosphorus pesticides (malathion, dimethoate and phorate) on the oxidation of LCV (leuco crystal violet) by potassium iodate in hydrochloric acid medium to give a violet colored dye. The dye shows maximum absorption at 592 nm. The fixed-time method was used for 15 min. The system obeys Beer's law in the range of 0.02-0.2, 0.032-0.32 and 0.03-0.3 µg mL -1 , for malathion, dimethoate, and phorate, respectively. Important analytical parameters such as time, temperature, reagent concentration, acidity etc, have been optimized for complete color reaction. Sandell's sensitivity and molar absorptivity for the system were found to be 0.0002, 0.0004, 0.0004 µg cm -2 and 1.2 × 10 6 , 5.21 × 10 5 , 6.3 × 10 5 L mol -1 cm -1 , respectively. The proposed method was satisfactorily applied to micro-level determination of organophosphorus pesticides in vegetable samples.

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“…Due to its wide use and toxicity, several methods like liquid chromatography with mass spectrommetry (LC-MS) [6][7][8], titrimetry [9], voltammetry [10,11], gas chromatography (GC) [12][13][14][15], high performance liquid chromatography (HPLC) [16], atomic absorption spectrophotometry (AAS) [17] and spectrophotometry [18--21] have been reported in the literature for the determination of organophosphates. Most spectrophotometric procedures involve the determination of organophosphorus insecticides by total phosphorus measurement, based on the formation of molybdenum blue using various reducing agents [4,19].…”

mentioning

confidence: 99%

Sensitive spectrophotometric methods for determination of some organophosphorus pesticides in vegetable samples

Gouda

Amin

El-Sheikh

et al. 2010

CI&CEQ

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Three rapid, simple, reproducible and sensitive spectrophotometric methods (A, B and C) are described for the determination of two organophosphorus pesticides, (malathion and dimethoate) in formulations and vegetable samples. The methods A and B involve the addition of an excess of Ce 4+ into sulphuric acid medium and the determination of the unreacted oxidant by decreasing the red color of chromotrope 2R (C2R) at a suitable λ max = 528 nm for method A, or a decrease in the orange pink color of rhodamine 6G (Rh6G) at a suitable λ max = = 525 nm. The method C is based on the oxidation of malathion or dimethoate with the slight excess of N-bromosuccinimide (NBS) and the determination of unreacted oxidant by reacting it with amaranth dye (AM) in hydrochloric acid medium at a suitable λ max = 520 nm. A regression analysis of Beer-Lambert plots showed a good correlation in the concentration range of 0.1-4.2 μg mL −1 . The apparent molar absorptivity, Sandell sensitivity, the detection and quantification limits were calculated. For more accurate analysis, Ringbom optimum concentration ranges are 0.25-4.0 μg mL −1 . The developed methods were successfully applied to the determination of malathion, and dimethoate in their formulations and environmental vegetable samples.

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A new extractive spectrophotometric method using malonyl dihydrazide for the determination of organophosphorus pesticides in surface residues

Cited by 13 publications

References 9 publications

Ligand exchange based paraoxon imprınted QCM sensor

Ligand exchange based paraoxon imprınted QCM sensor

A catalytic kinetic spectrophotometric determination of organophosphorus pesticides in vegetable samples

Sensitive spectrophotometric methods for determination of some organophosphorus pesticides in vegetable samples

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