Sampling Harbor

Figure IB. Map of Arthur Harbor showing location of the four sampling sites (A, B, Q and D). (Reproduced with permission from reference 46. Copyright 1991 Cambridge.)...

Results. Various solvent mixtures were tested for extraction efficiency. The test sample was a bone-dry sediment reference material containing 24.6 ppm of Arochlor 1242. This reference material is a real sediment from New Bedford Harbor which was homogenized and carefully assayed for PCB s by the Cincinnati EPA facility. Figure 3 shows recovery of 1242 using (1) hexane alone, (2) hexane and water (1 1), (3) hexane, water, and ethyl ether, (4) ethyl ether and water, (5) ethyl ether, water, and methanol, (6) methanol and hexane (1 1), and (7) water, methanol, and hexane (1 4 5). This last combination appears to give the best recovery. When added in this order to a dry sample, the effect of the water is to wet the sample, thus permitting extraction by methanol. The extracted PCB is partitioned almost exclusively into the hexane from the aqueous methanol. Final recovery is calculated from initial weight and hexane volume. 

N. Simpson and K.C. van Home (eds), Varian Sorbent Extraction Technology Elandbook, Varian Sample Preparation Products, Harbor City, CA (1993). 

Waukegan Harbor, Illinois, Lake Michigan August 1978 heavily contaminated by PCBs Sediments, samples from 5 locations ... 

Figure l Photograph of diver collecting water samples during early studies on dissolved explosives in simulated ordnance in waters off San Clemente Island. Water is drawn by a pump over a solid phase microextraction fiber (not seen in photo) where explosives are retained and enriched. The SPME fiber was then presented to an IMS analyzer for the determination of explosives. Full application of these methods was made in Halifax Harbor. Source [72]... 

Diphenylhydrazine has been assayed but not detected in fish samples from the Great Lakes area. Camanzo et al. (1987) reported that no 1,2-diphenylhydrazine was detected in fish samples from 13 Lake Michigan tributaries and Grand Traverse Bay fish. Analyses were made by GC/MS and no detection limits were given. Similarly, DeVault (1985) reported that a GC/MS did not identify any of the peaks present in fish samples from Great Lakes Harbors and Tributaries as... 

Bloom. The June 1981 bloom in Quartermaster Harbor was also characterized by a sharp increase, then a rapid decline in the G. catenella population. Cell densities in afternoon samples from the 1 m depth at Station DT rose to 1.7 x 10 cells-I and toxin content of bay mussels from pilings to 1916 yg toxin/100 g meat (Figure 6). 

Aquatic Resources Division. The samples were from an ongoing serial study beginning in September of 1982 to assess the effects of manmade harbor on the CTX levels in nearshore fishes at the entrance of Barbers Point Harbor. A control site, approximately 8 miles northwest of Barbers Point called Ewa was selected for procurement of the same two species. Fish samples were obtained by three methods (1) spearing (2) handline and (3) netting. Eight pieces,... 

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