TABLE 14. COMPARISON OF METHODS FOR EXTRACTION OF PHTHALATE 
_ ESTERS FROM CHESTER RIVER, MOUTH SEDIMENT. TEST 1. 
Extraction Method Amount Extracted, ppm , and 
Standard Deviation 
/ DEP / DBP / DEHP 
Ultrasonication 0.19 + 0.03 0.36 + 0.07 0.40 + 0.06 
Soxhlet, dry 0.10 + 0.03 0.33 + 0.14 0.34 + 0.06 
Soxhlet, wet 0.05 + 0.10 0.26 + 0.07 0.21 + 0.12 
Re-extraction by ultrasonication of sediment from all three 
methods yielded less than 1 percent of the first extraction value 
for all three phthalates. 
\ 
TABLE 15. TEST OF VARIED EXTRACTION AND RE-EXTRACTION PROCEDURES 
Sample 
Test 
Method 
Sediment Trials Result (ppm) 
State 
Chester 
River 
1 
Soxhlet and 
Dry and 
3 
See Table 
Sample 
"R" 
sonication 
wet 
(same) 
2a 
Soxhelt 
Dry 
3 
0.9+0.1(DBP) 
Re-Sonication 
II 
3 
0.04+0.02(DBP) 
(same) 
2b 
Soxhlet 
II 
4 
0.7+0.1 (DBP) 
Re-Sonication 
II 
3 
0.02 (DBP)t 
Re-Soxhlet 
II 
1 
0.02 (DBP)f 
Tenneco 
Pond 
3 
Soxhlet 
Wet 
1 
1.0xl0 3 (DEHP) 
Sonication 
Dry 
5 
(1.2+0.1)xlO 3 
(DEHP) 
+ Uncertainties are expressed as standard deviations of the mean 
values (rounded up). 
^ i.e., none detected. 
Internal Standard: D-10-anthracene 
68 
