Distribution of pesticides in immiscible binary solvent systems for cleanup and identification and its application in the extraction of pesticides from milk

Beroza, Morton; Inscoe, May N.; Bowman, Malcolm C.

doi:10.1007/978-1-4615-8458-2_1

Cited by 26 publications

(11 citation statements)

References 113 publications

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“…Physical and chemical factors that may influence biomagnification of DDT and methoxychlor by bacteria p-value = fraction of the total solute that distributes itself in the nonpolar phase of an equivolume solvent pair(1,2). Surface area = 27rrl + 47rr2.…”

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confidence: 99%

Biomagnification of p, p′-DDT and Methoxychlor by Bacteria

Johnson

Kennedy

1973

Applied Microbiology

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Aerobacter aerogenes and Bacillus subtilis accumulated p,p'-DDT and methoxychlor directly from water. Uptake of both "C-labeled organochlorine insecticides was rapid; 80 to 90% of the 24-h residues were reached within 30 min. Total cellular residues varied linearly with concentrations of DDT and methoxychlor in water ranging from 0.5 to 5.0 Asg/liter. The residue magnification factors from water were between 1,400-to 4,300-fold, but were independent of insecticide concentrations in water. When the insecticide-exposed microbial cells were washed with pesticide-free water, DDT residues were 45% in A. aerogenes and 30% in B. subtilis, whereas the methoxychlor level decreased nearly 75% in both organisms. Subsequent washing did not further reduce the insecticide residue. Autoclave-killed bacteria also rapidly adsorbed DDT and methoxychlor from water and, in some instances, residues were higher than in the living cells. Molecular polarity and lipid solubility appear to influence the retention of the organochlorine insecticides by bacterial cells. we also determined the water content of these bacteria. The values obtained are listed in Table 3. Water samples were extracted twice in a separatory funnel with petroleum ether-diethyl ether (95:5, volV vol) combined, dried over anhydrous sodium sulfate, and carefully evaporated to 1 ml. The emulsifier: fluor was added to the extract, and the sample was counted as previously described. Extraction efficiency from water for both compounds was 99%. Qualitative analyses of the insecticide residues

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confidence: 99%

Biomagnification of p, p′-DDT and Methoxychlor by Bacteria

Johnson

Kennedy

1973

Applied Microbiology

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“…The water solubilities of these acids were determined by gas chromatography and titration of carefully prepared, saturated solutions, and the p-values for the water/ ethyl acetate system were determined-according to Beroza et al (13). The results of these measurements are presented in Table 1.…”

Section: Resultsmentioning

confidence: 99%

The chemistry of some methoxychlor derivatives

Baarschers¹,

Vukmanich²

1986

Can. J. Chem.

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. 64, 932 (1986).The preparation of 1-chloro-2,2-bis@-methoxypheny1)ethylene (3a) and of 1-chloro-2,2-bis(p-hydroxypheny1)ethylene (3b), required for a study of the microbial degradation of methoxychlor ( l a ) was reinvestigated. ' The methoxy compound (3a) was readily obtained by alkaline dehydrohalogenation of 1,l-dichloro-2,2-bis(p-methoxypheny1)ethane (2a), but similar treatment of 1,l-dichloro-2,2-his@-hydroxypheny1)ethane (2b) gave a chlorine-free compound, characterized as the diethyl acetal of 2,2-bis(p-hydroxyphenylacetaldehyde (5a) on the basis of spectroscopic evidence and comparison with a model compound. Also, 2,2-bis(p-methoxypheny1)acet.i~ acid (4a) and 2,2-bis(p-hydroxypheny1)acetic acid (46) were prepared and the solubility and p-values (ethyl acetatelwater) of these acids were determined. WILLIAM H. BAARSCHERS et JAMES P. VUKMANICH. Can. J. Chem. 64, 932 (1986).On a rCCtudiC la prtparation du chloro-1 his@-mCthoxyphCny1)-2,2 Cthylbne (3a) et du chloro-1 bis(p-hydroxyphCny1)-2,2 Cthylbne (3b) qui nous Ctaient nkcessaires pour une Ctude de la dCgradation microbienne du mCthoxychlor (la). On obtient facilement le compost mCthoxylC (3a) par une dChydrohalogCnation alcaline du dichloro-1,l bis(p-mCthoxyphCny1)-2,2 Cthane (2a); toutefois, si l'on traite le dichloro-1 ,1 bis(p-hydroxyphtny1)-2,2 Cthane (2b) de la m&me manikre, onobtient un composC ne contenant pas de chlore. Sur la base de donnCes spectroscopiques et par comparaison avec un composC modble, on a Ctabli qu'il s'agissait du ditthyl acCtal du his@-hydroxyphCny1)-2,2 acCtaldChyde (5a). De plus, on a prCpar6 l'acide bis(p-mkthoxyphCny1)-2,2 acCtique (4a) et l'acide bis(p-hydroxyphCny1)-2,2 acttique (4b) et l'on a dtterrnink leurs solubilitCs ainsi que leurs valeurs p (acetate d'kthyleleau).[Traduit par la revue]

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“…These additional retention times and column temperatures may prove useful for analysis in circumstances where unexpected interferences occur or where additional confirmation of identity is desired. As a further aid in confirming identities at the ng level, values (Beroza and Bowman, 1965;Beroza et al, 1969) were determined in six solvent systems, representing a wide range of partition coefficients. These data are given in Table III.…”

Section: Resultsmentioning

confidence: 99%

Determination of dasanit and three of its metabolites in corn, grass, and milk

Bowman¹,

Hill²

1971

J. Agric. Food Chem.

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Dasanit { , -diethyl 0-[p-(methylsulfinyl)phenyl]phosphorothioate) and three of its metabolites were determined in corn, grass, and milk. Extracts were separated by liquid chromatography on silica gel into three fractions which were concentrated and injected into a gas chromatograph equipped with a flame photometric detector sensitive to phosphorus. No additional cleanup was required, since no interference from crop or milk extract was encountered.

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Distribution of pesticides in immiscible binary solvent systems for cleanup and identification and its application in the extraction of pesticides from milk

Cited by 26 publications

References 113 publications

Biomagnification of p, p′-DDT and Methoxychlor by Bacteria

Biomagnification of p, p′-DDT and Methoxychlor by Bacteria

The chemistry of some methoxychlor derivatives

Determination of dasanit and three of its metabolites in corn, grass, and milk

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