Indirect cationic chromatography with fluorometric detection

Sherman, Jeffrey H.; Danielson, Neil D.

doi:10.1021/ac00137a027

Cited by 30 publications

(2 citation statements)

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“…New analytical techniques that enable determination of pesticide residues in complex sample matrices with shorter turnaround time, improved sensitivity, and/or reliability are in constant demand. At present, most analytical methods in the literature involve extraction of pesticide residues from plant tissues by organic solvents (1)(2)(3)(4), surfactants (5,6), supercritical fluids (7), or solid-phase extractants (8)(9)(10) followed by GC or HPLC determination (11)(12)(13). These extraction and cleanup procedures are usually tedious and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

The Application of Solid Phase Microextraction in the Analysis of Organophosphorus Pesticides in a Food Plant

Chen

Poon

Lam

1998

Environ. Sci. Technol.

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A SPME method for the determination of organophosphorus pesticide residues in a local food plant, Chrysanthemum coronarium, was established. Pesticide residues were extracted by SPME fiber (with 100 µm poly(dimethylsiloxane) coating) from a biphasic water/plant tissues mixture and determined by GC-FPD. An equilibrium model was derived for the system and revealed that pesticide recoveries were related to the water:plant tissues ratio, f, and the partition coefficient, K WV , for the distribution of pesticides between the aqueous phase and the plant tissues. The model was verified by four organophosphorus pesticides, namely phorate, diazinon, methyl parathion, and ethion. The best fitted K WV values (P < 0.05) for the pesticides were found to be 4.73 ( 0.32 × 10 -2 (phorate); 1.11 ( 0.10 × 10 -1 (diazinon); 9.18 ( 0.95 × 10 -2 (methyl parathion); and 8.21 ( 1.28 × 10 -3 (ethion). Remarkable correlation between the K WV of the organophosphorus pesticides and their octanol/water partition coefficients, K OW , was also established.

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Section: Introductionmentioning

confidence: 99%

The Application of Solid Phase Microextraction in the Analysis of Organophosphorus Pesticides in a Food Plant

Chen

Poon

Lam

1998

Environ. Sci. Technol.

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“…Bulky multicharged eluents should permit the use of very dilute mobile phases without compromising the analysis time, but still providing low detection limits (13). Although a triply charged cation, Ce3+, has been used for IPC (14), we believe a pH-independent triply charged anion has not been employed as an IPC eluent.…”

Section: Introductionmentioning

confidence: 99%

Indirect photometric chromatography of anions using sodium naphthalenetrisulfonate

Maki¹,

Danielson²

1991

Anal. Chem.

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A triply charged eluent has been characterized for anion-exchange chromatography with Indirect photometric detection. Sodium naphthalenetrisulfonate has shown particular promise for the separation and detection of N02", Br, N03", S042~, I", and SCN". The analysis of a mixture containing these anions can be performed In less than 16 min with detection limits of 0.4-1 ng for all anions. The determination of the strongly retained sulfur oxides such as dithlonlte, tetrathlonate, and other polythlonates can be easily accomplished with this highly charged eluent In a short time with high sensitivity. The chromatographic performance of this eluent requires no pH adjustment of the mobile phase. In addition, chromatograms obtained with this eluent were free from any system peaks.

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1994

Ion Chromatography

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Indirect cationic chromatography with fluorometric detection

Cited by 30 publications

References 15 publications

The Application of Solid Phase Microextraction in the Analysis of Organophosphorus Pesticides in a Food Plant

The Application of Solid Phase Microextraction in the Analysis of Organophosphorus Pesticides in a Food Plant

Indirect photometric chromatography of anions using sodium naphthalenetrisulfonate

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