Table 6. Set 1, trial 4. Mean and standard deviations of triplicate analyte concentrations of spiking solution (g)

Table 5. Set 3, trial 3. Mean and standard deviations of triplicate analyte concentrations of spiking solution (g)

Table 7. Set 4, trial 5. Mean and standard deviations of triplicate gasoline concentrations of spiking solution (g)

SR95_26
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Table 6. Set 1, trial 4. Mean and standard deviations of tripli-

cate analyte concentrations of spiking solution (g) after 2

and 30 days of refrigerated storage, and for analyte concen-

trations (g/g) in preserved and unpreserved samples stored

at 22 and 4C.

Treatment aliquot

Treatment aliquot

Storage period

A. 22C --unpreserved (g/g)

Storage period

B. 4C--unpreserved (g/g)

C. 22C--preserved with NaHSO4 (g/g)

* ND = not detected, less than 0.02 g of VOC/g

† Same set used for day 0 values for unpreserved samples

tion of ortho-xylene (o-Xyl), all of the aerobically

the unpreserved soil samples treated with gaso-

degradable compounds were completely lost with-

line were also lost within this 5- to 9-day period,

in five days (Fig. 7). The slower rate of degrada-

when held at room temperature (Fig. 1). Further-

tion for o-Xyl is believed to be due to a steric

more, even the straight and branched chained ali-

hindrance unique to orthoisomers.* In addition,

phatics in gasoline that were not specifically iden-

the aromatic compounds (benzene [Ben], tolu-

tified, e.g., hexanes and pentanes, were degraded

ene [Tol], ethyl benzene [E-Ben], para-xylene [p-

rapidly at room temperature. Overall, these rates

Xyl] and o-Xyl) that could be easily identified in

of degradation for all of the analytes tested were

consistent with those extrapolated from aqueous

systems, where half-lives are on the order of days

for aromatic hydrocarbons and weeks to months

* Personal communication with Thomas F. Jenkins,

for the chlorinated compounds (Printup 1991).

Western Governors University

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