APPENDIX B: ANALYTE LOSSES

Table A5. Continued

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APPENDIX B: ANALYTE LOSSES

Table B1. An example of the calculations used to determine the losses of analytes after 5 and 10

For this example:

Time = 10 minutes

Analyte lost = PCE

Sorptive Material = PVC

1. Determination of the percent sorbed after 10 minutes vs 60 minutes based on the data of

Barcelona et al. (1985).

Analyte sorbed* (g/m2)

* These values are taken from Figure 2 in Barcelona et al.

† Rounding to nearest 5% = 75%.

SIL = Silicone rubber tubing.

2. Amount of PCE sorbed by PVC after 60 minutes in our study = 1 (mean normalized concentra-

tion of PCE in solution) = 1 0.018= 0.982.

3. (#1) (#2) = (75%) (0.982) = 74% of the PCE in solution would be sorbed by PVC after 10 minutes'

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