Validity of Using Semipermeable Membrane Devices for Determining Aqueous Concentrations of Freely Dissolved PAHs (pp 535-536)
H. Prest, J.D. Petty, J. N. Huckins

Authors' Reply
K. E. Gustafson, R.M. Dickhut

Toxicity and Fate of Silver in the Environment - Editorial (pp 537-538)
J. Gorsuch, S.J. Klaine

Sources of Silver in the Environment (pp 539-546)
T.W. Purcell, J.J. Peters

Toward a Better Understanding of the Bioavailability, Physiology, and Toxicity of Silver in Fish: Implications for Water Quality Criteria (pp 547-561)
C. Hogstrand, C.M. Wood

Trophic Transfer of Silver to Marine Herbivores: A Review of Recent Studies (pp 562-571)
N.S. Fisher, W-X. Wang

Effects of Laboratory Test Conditions on the Toxicity of Silver to Aquatic Organisms (pp 572-578)
R.J. Erickson, L.T. Brooke, M.D. Kahl, F.V. Venter, S.L. Harting, T.P. Markee, R.L. Spehar

Physiological Analysis of the Stress Response Associated with Acute Silver Nitrate Exposure in Freshwater Rainbow Trout (Onchorhynchus mykiss) (pp 579-588)
N.A. Webb, C.M. Wood

Acute Silver Toxicity to Seawater-acclimated Rainbow Trout: Influence of Salinity on Toxicity and Silver Speciation (pp 589-593)
E.A. Ferguson, C. Hogstrand

Toxicity of Silver to the Marine Teleost the Tidepool Sculpin (Oligocottus maculosus): Effects of Salinity and Ammonia (pp 594-600)
J.R. Shaw, C.M. Wood, W.J. Birge, C. Hogstrand

Toxicity of Silver Sulfide-spiked Sediments to the Freshwater Amphipod, Hyalella azteca (pp 601-604)
M.P. Hirsch

Bioaccumulation of Silver from Laboratory-spiked Sediments in the Oligochaete, Lumbriculus variegatus (pp 605-609)
M.P. Hirsch

Availability of Sludge-Borne Silver to Agricultural Crops (pp 610-616)
M.P. Hirsch

Aerobic Biodegradation of a Silver-Bearing Photoprocessing Wastewater (pp 617-624)
S.G. Pavlostathis, S.K. Maeng

Reactivity of Ag+ Ion with Thiol Ligands in the Presence of Iron Sulfide (pp 625-629)
N.W.H. Adams, J.R. Kramer

Removal, Partitioning, and Fate of Silver and Other Metals in Wastewater Treatment Plants and Effluent-Receiving Streams (pp 630-641)
M.M. Shafer, J.T. Overdier, D.E. Armstrong

Determination of Silver Ions at Submicrogram-per-Liter Levels Using Anodic Square-Wave Stripping Voltammetry (pp 642-649)
D.E. Schildkraut, P.T. Dao, J.P. Twist, A.T. Davis, K. Robillard

Halogenation and Toxicity of the Biogradation Products of a Nonionic Surfactant, Nonylphenol Ethoxylate (pp-650-654)
H. Maki, H. Okamura, I. Aoyama, M. Fujita

Sensitivity Limits and EC50 Values of the Vibrio fischeri Test for Organic Micropollutants in Natural and Spiked Extracts from Sediments (pp 655-661)
M. Salizzato, V. Bertato, B. Pavoni, A.V. Ghirardini, P.F. Ghetti

Partitioning and Mineralization of [¹⁴C]-Lindane in a Laboratory Sediment-Water System (pp 662-669)
W. Kalsch, T. Knacher, M. Robertz, G. Studinger, C. Franke

Tentative Identification of Persistent Poly(glycidyl) Mono-fluoro-octylphenyl Ether Nonionic Surfactant in River Waters and Effluent from a Secondary Wastewater Treatment Plant (pp 670-674)
T. Yamagishi, S.Hashimoto, A. Otsuki

Copper Tolerance in Iron-Reducing Bacteria: Implications for Copper Mobilization in Sediments &endash; Short Communication (pp 674-678)
J.T. Markwiese, J.S. Meyer, P.J.S. Colberg

Exposure of Female Juvenile Rainbow Trout to Alkylphenolic Compounds Results in Modifications to Growth and Ovosomatic Index (pp 679-686)
L.A. Ashfield, T.G. Pottinger, J.P. Sumpter

Biomonitoring with Shrimp to Detect Seasonal Change in River Water Toxicity (pp 687-694)
H. Shigehisa, H. Shiraishi

Bioavailability of Methylmercury to Sacramento Blackfish (Orthodon microlepidotus): Dissolved Organic Carbon Effects (pp 695-701)
M.H. Choi, J.J. Cech, Jr., M.C. Lagunas-Solar

Fluctuating Concentrations of Organochlorine Pollutants during a Breeding Season in Two Antarctic Seabirds: Adélie Penguin and Southern Fulmar (pp 702-709)
N. van den Brink, J.A. van Franeker, E.M. de Ruiter-Dijkman

Response of Vegetation to Volatile Pollutants: A Delivery System for Controlled, Quantifiable Chronic Exposure of Foliage (pp 710-713)
S.D. Love, B.A. Hale

Predicting Toxicity in Marine Sediments with Numerical Sediment Quality Guidelines (pp 714-727)
E.R. Long, L.J. Field, D.D. MacDonald

Degradation of Chlorinated Benozic Acid Mixtures by Plant-Bacteria Associations (pp 728-733)
S.D. Siciliano, J.J. Germida

Behavioral and Histopathological Effects of Fluoranthene on Bullfrog Larvae (Rana catesbeianna) (pp 734-739)
S.E. Walker, D.H. Taylor, J.T. Oris

Acute Toxicity and Toxicokinetics of 4-Heptylphenol in Juvenile Atlantic Cod (Gadus morhua L.) (pp 740-746)
K-E. Tollefsen, K. Ingebrigtsen, A.J. Olsen, S. Johnsen

Comparative Developmental Toxicity of Planar Polychlorinated Biphenyls Congeners in Chickens, American Kestrels and Common Terns (pp 747-757)
D.J. Hoffman, M.J. Melancon, P.N. Klein, J.D. Eisemann, J.W. Spann

Vertical Distribution of Acid Volatile Sulfide and Simultaneously Extracted Metals in a Recent Sedimentation Area of the Meuse River in The Netherlands (pp 758-764)
G.A. van den Berg, J.P.G. Loch, L.M. van der Heijdt, J.J.G. Zwolsman

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