Table 4. Set 2, trial 2. Mean and standard deviations of triplicate analyte concentrations of spiking solution (g)

RESULTS AND DISCUSSION - SR95_260011

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

SR95_26
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Table 4. Set 2, trial 2. Mean and standard deviations of

triplicate analyte concentrations of spiking solution (g)

and of analyte concentrations (g/g) for preserved and un-

preserved samples stored at 22 and 4C.

Analyte

Analyte

Day

Day 4

Day 8

Day 14

Day 28

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

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

C. 22C--preserved with NaHSO 4 (g/g)

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

† Same set used for day 0 values for unpreserved samples.

could not be compensated simply by matching

that the analytes with o/w partition coefficients

of less than 2.6 had concentrations in the pre-

the solution matrix between samples and stan-

served soil samples that were consistently greater

dards (i.e., using matrix modifiers). Despite these

trends, the sample treatment precision and the

than the spiking solution. These two findings are

consistent with analyteorganic carbon partition

levels established for the analytes in the soil sam-

phenomena (Chiou 1989) and salting out (Ioffe

ples were adequate for assessing VOC concentra-

and Vitenberg 1982). Briefly, the greater the oc-

tion stability.

tanolwater partition (o/w) coefficient the great-

Consistent with previous studies where sam-

ples were held in either sealed glass ampoules or

er the tendency for an organic compound to parti-

capped VOA vials (Hewitt 1994, Hewitt 1995a,b),

tion with the organic matter present in a given

only small decreases were observed (<35%) for

soil, while salting out affects the solubility of a

the chlorinated compound concentrations. This

VOC. Since the differences in concentrations be-

trend was fairly independent of storage condition

tween the spiking solution and that of the pre-

served samples were products of both organic

or preservation, and was believed to be caused by

matter partitioning and salting out, these changes

slow soil sorption (Chiou 1989). To support this

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