2000
DOI: 10.1007/s004149900121
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A new diquat derivative appropriate for colourimetric measurements of biological materials in the presence of paraquat

Abstract: A new colourimetric method is described for the quantification of diquat using a yellow-coloured derivative produced by heating diquat in alkaline solution at 80 degrees C. The absorption maximum of the yellow derivative is 420 nm and the molar absorption coefficient is 2.76 x 10(4) (0.15 in 1 microgram diquat/ml with 1 cm light path). The absorption at 420 nm shows a linear concentration dependence in the range 0.1-10 micrograms/ml and fading of the colour is about 5% after 1 h. Under the same conditions, par… Show more

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Cited by 15 publications
(3 citation statements)
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“…On the contrary, poisoning with pesticides like paraquat or diquat are described more often [16]. These substances have been extensively investigated and a new method to measure diquat in the presence of paraquat was published previously [17]. Altogether, the OP omethoate seems to be a scarcely used substance.…”
Section: Discussionmentioning
confidence: 98%
“…On the contrary, poisoning with pesticides like paraquat or diquat are described more often [16]. These substances have been extensively investigated and a new method to measure diquat in the presence of paraquat was published previously [17]. Altogether, the OP omethoate seems to be a scarcely used substance.…”
Section: Discussionmentioning
confidence: 98%
“…167 DQ can also be quantified by heating the herbicide in alkaline solution at 80°C, which produces a yellow-colored derivative that presents an absorption maximum at 420 nm without interference from PQ. 168 This yellow DQ derivative can be extracted completely with cyclohexanol by saturating the solution with sodium sulfate. The absorption maximum in cyclohexanol shifts to 440 nm with the same molar absorbance and the same half-band width as in water.…”
Section: Analytical Toxicologymentioning
confidence: 99%
“…Absorption spectrophotometric spectrum of DQ 2þ (blue), DQ radical monocation (DQ þ ) after reduction with sodium dithionite (green), complex after reduction with 2-mercaptoethanol, DL-dithiothreitol, or L-cysteine (red) that turns purple in 1-butanol, and diquat derivative (yellow) produced at 80 C in 0.5 N sodium hydroxyde solution. DQ: diquat or 1,1 0 -ethylene-2,2 0 -bipyridiniumData are based on the studies of Maiti et al, Minakata et al, and Moffat et al[165][166][167][168][169] …”
mentioning
confidence: 99%