Concentration of Methyl Parathion from Penncap-M in Pollens of Various Lipid and Oil Contents 1

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Abstract
Samples of hand-collected pollens ( Franseria confertiflora , Cupressus arizonica , and Helianthus annuus ), a bee-collected pollen ( Taraxacum officinale ), and the extracted lipids (chloroform-methanol, 2:1) from H. annuus and T. officinale were exposed to fumes of methyl parathion [ O , O -dimethyl O - ( p -nitrophenyl) phosphorothioate] from Penncap-M capsules. Amounts of methyl parathion absorbed were quantitatively determined by gas-liquid chromatography. The pollens generally absorbed methyl parathion in amounts related to their lipids and ether-extractables content. The extracted lipids absorbed two to three times as much methyl parathion as did the intact pollens. Slender ragweed pollen, Franseria confertiflora , did not accumulate as much methyl parathion as the other pollens. In Penncap-M-treated fields, pollens of certain plants may become toxic to pollen-eating and pollen-collecting insects, due to pesticide absorption by lipids, but some pollens may be less hazardous than others, due to differential absorption.

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