Dieldrin chemical properties

Aldrin and dieldrin have similar physical and chemical properties, and hence exhibit similar behavior in animals and during analysis. The following relationship is used as an indicator of oxidative metabolic capability, and it is termed the aldrin metabolic index (AMI) ... 

The order of contributions of OCPs to the total mass of OCPs measured in bivalves (Kim et al., 2002b) and sediment (Flong et al., 2006), was DDTs (63%)>HCHs (21%)>CHLs (11 %)>dieldrin (1%). A possible explanation for this observation is the difference in chemical properties... 

The vapor density of dieldrin over a Gila silt loam (0.6% om) increases with the concentration in the soil (Fig. 4.5) and at soil concentrations of only 100 ppm gives a vapor density essentially equal to that of the pure compound. As would be expected, vapor density over the soil increases with temperature. The effect of soil water content on the vapor density of dieldrin over the same sod has been reported and from Figure 4.6 it is clear that a dry sod results in a dramatic reduction in vapor density. In discussing sorption of gases on sod (see Physical chemical properties. Chapter 2) it was suggested that this effect resulted from water displacing the compound from the more polar sorption surfaces (e.g., clays) and it can be seen that this transition occurs quite abruptly. The effect of composition on the vapor density of dieldrin over soil is illustrated by the data in Table 4.7. ... 

The detectability (1) of hydrocarbon pesticides varies because of their differing chemical structure and physical properties. The practical minimum limits of analysis by this procedure are (a) 10 p.p.t. or less for aldrin, DDD, DDT, dieldrin, endrin, heptachlor, heptachlor epoxide,... 

It is important to confirm the identity of pesticide residues convincingly. Some methods, such as TLC, paper chromatography, or p-values share the same physical property of partition in achieving separations of mixtures. They do not give independent evidence for the identity of a compound. Similarly, GLC retention times for a compound on different stationary phases are often highly correlated. Thus, the choice of confirmatory techniques should be carefully made. Although powerful methods such as GC/MS are being studied, there is a need for simpler operations—for instance, the formation of chemical derivatives. Experiments with aldrin and dieldrin have revealed a number of reactions which are convenient for the confirmation of residues of these compounds. 

Dieldrin (CAS 60-57-1) Minor skin irritant. Potent convulsant and hepatotoxin. Dermal absorption is a major route of systemic poisoning. Overexposures produce headache, dizziness, twitching, and convulsions. Limited evidence for adverse effects on fetal development and caicinogenicity in test animals (lARC 3). See also p 161. 0.25 mg/m , S NIOSH CA 50 mg/m Light brown solid flakes with a mild chemical odor. Appearance and some hazardous properties vary with the formulation. Vapor pressure is 0.0000002 mm Hg at32°C (90°F). Not combustible. 

Hexachlorocyclopentadiene is the basis for a number of pesticides such as Chlorodane, Aldrin, Dieldrin, and Kepone. The production of some of these materials has been banned in many regions because of their carcinogenic properties and toxicity to wildlife. Hexachlorocyclopentadiene is also the raw material for chlorendic acid, which is used as a flame retardant (product information from Velsicol Chemical Corp.) for imsatimated polyester resins. 

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