Factors affecting the extraction of dieldrin-14C from soil

Abstract

Dieldrin-14C was extracted from eight types of soils with various solvents under a variety of conditions. Recovery of dieldrin from soil was increased with

Influence of the type of mineral soil on the uptake of dieldrin by wheat seedlings

“…Bioactivity of soil insecticides increases with increasing moisture content of the soil (Harris, 1964(Harris, , 1966(Harris, , 1967, suggesting that in dry soils insecticides are inactivated by strong adsorption on soil particles, and the presence of water in soil reactivates these compounds by desorption. A similar conclusion was reached from studies on the effect of moisture on the extraction of dieldrin from soil (Saha et al, 1969). It was observed that the addition of water to dry soil desorbs dieldrin from soil particles, which can then be easily extracted by solvents.…”

“…The dieldrin content of the eluate was determined by gas-liquid chromatography after the addition of a known amount of the internal standard to the eluate, and the results were expressed on the oven-dry weight of the soil. The true recovery of dieldrin from soil, as determined by using dieldrin-14C treated soil, was 92 to 98 % (Saha et al, 1969), irrespective of the soil type.…”

Polychlorinated biphenyls in sediments of the tidal Hudson River, New York

“…Negative chemical ionization screening following a hexane extraction cleanup has demonstrated low-level contamination of human populations with 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) (2). Another related and widely used herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D), was not detected in these screening experiments nor was the widely used herbicide 4-amino-3,5,6-trichloropicolinic acid (picloram).…”

RESIDUES OF METHOMYL IN RAPE PLANT AND SEED FOLLOWING ITS APPLICATION FOR THE CONTROL OF BERTHA ARMYWORM, MAMESTRA CONFIGURATA (LEPIDOPTERA: NOCTUIDAE)

“…The oil and methomyl residues from rape seed were extracted with a mixture of methanol and ethyl acetate (1 : 9, v/v) by shaking 20 g of seed with 80 ml of the solvent mixture in Swedish ball mill (Saha et al 1969) tubes for 2 hr. The contents of the tubes were filtered under suction and the residue washed three times with 15 ml of the solvent mixture each time.…”