caa a22 4500 469029978 CHVBK 20180323132740.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF00402653 doi (NATIONALLICENCE)springer-10.1007/BF00402653 Butyltin and copper monitoring in a Northern Chesapeake Bay marina and river system in 1989: An assessment of tributyltin legislation [Elektronische Daten] [Lenwood Hall Jr., Michael Unger, Michael Ziegenfuss, John Sullivan, Steven Bushong] This study was designed to: (1) evaluate dibutyltin (DBT) and tributyltin (TBT) bi-weekly in the water column for four months during the peak boating season (June-September, 1989) at seven stations in the Back Creek and Severn River area of Maryland waters of Chesapeake Bay; (2) compare butyltin values from the 1989 study with values obtained from a similar butyltin monitoring study conducted in 1988 (after Maryland TBT legislation) and 1986 (before Maryland TBT legislation); (3) determine the extent of TBT paint use in the Back Creek area by surveying boat owners; (4) determine dissolved copper concentrations from three of the seven stations bi-weekly during the four-month study; and (5) compare dissolved copper concentrations at these stations with previous copper data collected in 1988. Mean four-month DBT concentrations ranged from 10 to 73 ng/L at the seven stations. Highest DBT concentrations occurred at Station 1 in a marina; lowest concentrations occurred at Station 7 in the Severn River. Mean four-month TBT concentrations ranged from 177 ng/L at Station 1 (marina) to 21 ng/L at Station 7 (Severn River). Maximum TBT concentrations of 361 and 570 ng/L occurred at marina SDtations 1 and 3, respectively. Temporal trends in both DBT and TBT (station mean concentrations by date) showed that peak concentrations occurred during the early part of the boating season followed by reductions in late summer and early fall. Spike concentrations of both DBT (117 and 62 ng/L) and TBT (308 and 366 ng/L) were reported on two sampling dates near a boat maintenance facility in Back Creek. There was a significant reduction in DBT concentrations from 1986 to 1989 when date was treated as a fixed effect. However, TBT concentrations were not significantly reduced between 1986 and 1989 when mean concentrations of TBT were averaged across stations and dates for each year. A significant reduction was reported at Station 1 (marina station) when each station was examined for differences between years. TBT was also reported to significantly decrease (p=0.0442) at Station 7 between 1988 and 1989. A boat owner survey in the study area showed that 6% of the recreational boats that were surveyed were painted with TBT paint in 1989. This was a significant decrease in TBT paint use from the previous year when 31% of recreational boat owners surveyed used TBT paints. An evaluation of dissolved copper concentrations at three stations in the study area in 1989 showed that mean concentrations from bi-weekly sampling for four months was 10 μg/L at Station 1, 7.8 μg/L at Station 4 and 2.7 μg/L at Station 7. Copper concentrations decreased with distance away from the Back Creek marinas. Copper concentrations at all three stations were significantly lower in 1989 than in 1988. Kluwer Academic Publishers, 1992 Hall Jr. Lenwood Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A. aut Unger Michael Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A. aut Ziegenfuss Michael Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A. aut Sullivan John Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A. aut Bushong Steven Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A. aut Environmental Monitoring and Assessment Kluwer Academic Publishers 22/1(1992-07-01), 15-38 0167-6369 22:1<15 1992 22 10661 https://doi.org/10.1007/BF00402653 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00402653 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hall Jr Lenwood Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A aut NATIONALLICENCE 700 1- Unger Michael Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A aut NATIONALLICENCE 700 1- Ziegenfuss Michael Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A aut NATIONALLICENCE 700 1- Sullivan John Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A aut NATIONALLICENCE 700 1- Bushong Steven Agricultural Experiment Station, Wye Research and Education Center, The University of Maryland, Box 169, 21658, Queenstown, Maryland, U.S.A aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 22/1(1992-07-01), 15-38 0167-6369 22:1<15 1992 22 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer