Residue Measurement, Separation and Measurement of 3-Hydroxy-N,N-dimethyl-cis-crotonamide Dimethyl Phosphate (Bidrin Insecticide) and 3-Hydroxy-N-methyl-cis-crotonamide Dimethyl Phosphate (Azodrin Insecticide) Residues in Crops by Selective Cleanup (Partition) Procedures

Lau, S. C.

doi:10.1021/jf60144a014

Cited by 5 publications

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

A New and Highly Sensitive Spectrophotometric Determination of Monocrotophos in Environmental, Agricultural and Biological Samples

Janghel

et al. 2006

Jnl Chinese Chemical Soc

View full text Add to dashboard Cite

A new and highly sensitive spectophotometric method is developed for the determination of parts per million levels of widely used organophosphorus pesticide monocrotophos. The method is based on alkaline hydrolysis of monocrotophos to N-methylacetoacetamide followed by coupling with diazotized p-amino acetophenone in alkaline medium. The absorption maxima of the reddish-violet coloured compound formed is measured at 560 nm. Beer's law is obeyed over the concentration range of 1.2 to 6.8 mg in a final solution volume of 25 mL. The molar absorptivity and Sandell's sensitivity were found to be 7.11 0 5 (±100) L mole -1 cm -1 and 0.008 mg cm -2 , respectively. The standard deviation and relative standard deviation were found to be ± 0.005 and 2.05%, respectively. The method is simple, sensitive and free from interferences of other pesticides and diverse ions. The method has been satisfactorily applied to the determination of monocrotophos in environmental, agricultural and biological samples.

show abstract

A New and Highly Sensitive Spectrophotometric Determination of Monocrotophos in Environmental, Agricultural and Biological Samples

Janghel

et al. 2006

Jnl Chinese Chemical Soc

View full text Add to dashboard Cite

show abstract

Biochemical Indicators of Environmental Pollution

Goldstein

1972

Indicators of Environmental Quality

View full text Add to dashboard Cite

Partition distribution of insecticides as a critical factor affecting their rates of absorption from water and relative toxicities to fish

Yang

Sun

1977

Arch. Environ. Contam. Toxicol.

View full text Add to dashboard Cite

Loaches, Misgurnus anguillicaudatus (Cantor), a common fish in Taiwan, were treated with DDT, dieldrin, and monocrotophos by continuous exposure in aqueous solutions (or suspensions) and by injection. DDT and dieldrin were 150 and 220 times more toxic, respectively, than monocrotophos, to the fish exposed in aqueous solutions (24-hr LC50), but only 1/9 and 1/4 as toxic as monocrotophos by injection (24-hr LD50). Results of GLC analyses indicate that, at the end of 24-hr exposure, 96.5% of DDT, 92.7% of dieldrin, and 14.3% of monocrotophos were absorbed by loaches from aqueous solutions. The initial rates of absorption for DDT and dieldrin were about 10 to 20 times faster than that for monocrotophos. The large differences in relative toxicity may be due to partition distribution which in turn caused differences in absorption, as DDT and dieldrin are lipophilic and monocrotophos is hydrophilic. Statistical analysis of the relationship between fish toxicities and partition coefficients supports the present finding. The coefficient of correlation is 0.70 between parition coefficients (benzene/water) and toxicities to fish (rainbow trout) of 12 organophosphorus insecticides, 0.74 between coefficients and corrected fish toxicities, and 0.96 between partition coefficients and corrected fish toxicities for organophosphates only. Results of analyses are significant at less than 1% probability level. Similar correlation was also obtained between partition coefficients for hexane/water and toxicities of 8 organophosphorus and 5 organochlorine insecticides to rainbow trout.

show abstract

Residue Measurement, Separation and Measurement of 3-Hydroxy-N,N-dimethyl-cis-crotonamide Dimethyl Phosphate (Bidrin Insecticide) and 3-Hydroxy-N-methyl-cis-crotonamide Dimethyl Phosphate (Azodrin Insecticide) Residues in Crops by Selective Cleanup (Partition) Procedures

Cited by 5 publications

References 0 publications

A New and Highly Sensitive Spectrophotometric Determination of Monocrotophos in Environmental, Agricultural and Biological Samples

A New and Highly Sensitive Spectrophotometric Determination of Monocrotophos in Environmental, Agricultural and Biological Samples

Biochemical Indicators of Environmental Pollution

Partition distribution of insecticides as a critical factor affecting their rates of absorption from water and relative toxicities to fish

Contact Info

Product

Resources

About