of organics on the C18 material. The total water 
volume was noted, usually 120-150 ml. 
5. The cartridge was returned to its original foil 
packet. The foil was bent to give partial seal¬ 
ing protection. The collected samples were 
stored in a clean glass bottle that was sealed 
until analysis was ready to be performed. 
6. Trials with varied amounts of isopropanol, 
methanol and tetrahydrofuran showed that 75-80 
percent recovery was obtained following desorp¬ 
tion with at least 1.5 ml of tetrahydrofuran; 
2.5 ml was used in the actual procedure. 
7. 1.7 ml of water was added to the extract from 
(6) to match the liquid composition to the 
initial carrier composition used in liquid 
chromatography. 
Sediment— 
1. Tenneco Pond and contiguous creek sediments. 
A small grab sampler was used to take surface 
samples. The sampler was opened and the sam¬ 
ple was discharged into a scrubbed galvanized 
metal bucket. A clean metal scoop was used 
to transfer the moist sediment to clean glass 
jars. 
2. Chester River. Sampling sites were selected 
near the main channel in order to obtain clay- 
rich specimens. A Van Veen grab sampler was 
used to bring up surface sediment samples. 
The sampler was fitted with a sliding panel 
to permit insertion of the coring tube. The 
clean brass coring tube was inserted to get 
a 10 cm vertical core of the uppermost sedi¬ 
ment. The brass tube was sealed by placing 
a hand at the top. Then the cylindrical core 
was lifted out of the grab sampler. The core 
was released onto baked aluminum foil, and 
then stored in the foil in a clean glass con¬ 
tainer. The latter was stored for library 
purposes. 
3. All sediment samples were transferred within 
12 hours to storage at 4°C until ready for 
drying. 
4. All sediment samples used in this study were 
subjected to the following drying procedure. 
49 
