Seasonal Variations of 2,4-D in Buckhorn Lake

1985 ◽  
Vol 20 (1) ◽  
pp. 106-117 ◽  
Author(s):  
E. Nagy ◽  
D.S. Painter
Keyword(s):  
Lake Water ◽  
Seasonal Variations ◽  
Water And Sediment ◽  
Streamflow Data ◽  
Land Runoff

Abstract A five month survey of 2,4-D in Buckhorn Lake water and sediment, combined with streamflow data, produced estimates of the chemical in the lake. The peak concentrations in the water alone were significantly higher than the documented uses would permit. Two distinct concentration peaks were shown by the chemical: one during the June milfoil control season, and one in late August, indicating a release of 2,4-D from the collapsed and decaying milfoil beds. The observed rates of disappearance of the chemical agreed with reported values, showing a limited persistence in the lake. The presence of 2,4-D in the spring sediments was attributed to land runoff.

Periodicity of Coliform Bacteria in an Aquatic Environment

1999 ◽  
Vol 40 (7) ◽  
pp. 151-157 ◽  
Author(s):  
U. S. Bagde ◽  
A. K. Rangari
Keyword(s):  
Lake Water ◽  
Water Body ◽  
Seasonal Variations ◽  
Bacterial Population ◽  
Winter Season ◽  
Total Coliform ◽  
Seasonal Distribution ◽  
Point Of View ◽  
Coliform Bacteria ◽  
Drinking Purposes

The present study deals with enumeration and seasonal distribution of total and faecal coliform bacteria, the indicators of microorganisms causing faecal pollution of the aquatic ecosystem by a multiple tube technique. A lake called Upvan lake of Thane city, India was investigated during 1996-97 for the purpose. Bacterial population varied with seasonal variations in the water body. Bacterial counts increased during summer months and lowered during winter months. Highest coliform counts were reported in monsoon and lowest in winter season. Samples collected from different sites of the lake showed wide variations in the counts of bacteria. Positive correlation was established between faecal and total coliform. Bacteriological analysis of lake water indicated that water was polluted by faecal contaminants to the extent that it was unportable for drinking purposes and unsuitable from the recreation point of view and hence needed thorough impoundment.

Lake Water and Sediment

1958 ◽  
Vol 3 (4) ◽  
pp. 459-475 ◽  
Author(s):  
F. R. HAYES ◽  
J. E. PHILLIPS
Keyword(s):  
Lake Water ◽  
Water And Sediment

scholarly journals Impact of the Sediment Organic vs. Mineral Content on Distribution of the Per- and Polyfluoroalkyl Substances (PFAS) in Lake Sediment

2020 ◽  
Vol 17 (16) ◽  
pp. 5642
Author(s):  
Dauren Mussabek ◽  
Kenneth M. Persson ◽  
Ronny Berndtsson ◽  
Lutz Ahrens ◽  
Kei Nakagawa ◽  
...  
Keyword(s):  
Sediment Core ◽  
Lake Water ◽  
Mineral Content ◽  
Heterogeneous Media ◽  
Dry Weight ◽  
Organic Carbon Content ◽  
Core Samples ◽  
Water And Sediment ◽  
Inorganic Content ◽  
Polyfluoroalkyl Substances

Contamination of the water and sediment with per- and polyfluoroalkyl substances (PFAS) was studied for the lake impacted by the release of PFAS-containing aqueous film forming foam (AFFF). PFAS concentrations were analyzed in lake water and sediment core samples. ΣPFAS concentrations were in the range of 95–100 ng L−1 in the lake water and 3.0–61 µg kg−1 dry weight (dw) in sediment core samples, both dominated by perfluorohexane sulfonate, perfluorooctane sulfonate; 6:2 fluortelomer sulfonate was inconsistently present in water and sediment core samples. The sediment–water partitioning coefficients (log Kd) were estimated and ranged 0.6–2.3 L kg−1 for individual perfluoroalkyl carboxylates (PFCAs) and 0.9–5.6 L kg−1 for individual perfluoroalkane sulfonates (PFSAs). The influence of the sediment inorganic content and organic matter on PFAS distribution was investigated. In studied sediments, the mineral content (corresponding to <5% of the bulk media mass) was mainly represented by sulfur, iron and calcium. The PFAS distribution was found strongly connected to the sediment mineral content (i.e., Fe, Pb, Rb and As), whereas the sediment organic carbon content did not to have a direct influence on the PFAS distribution. The aim of this study was to improve our understanding of the PFAS distribution in the natural heterogeneous media.

Bacterial Degradation of 2-Methylisoborneol

1988 ◽  
Vol 20 (8-9) ◽  
pp. 205-210 ◽  
Author(s):  
G. Izaguirre ◽  
R. L. Wolfe ◽  
E. G. Means
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Carbon Source ◽  
Lake Water ◽  
Sole Carbon Source ◽  
Natural Waters ◽  
Bacterial Degradation ◽  
Sediment Samples ◽  
Water And Sediment ◽  
Water And Sediment Samples

2-Methylisoborneol (MIB) is a musty-odored compound occurring in natural waters that is difficult to remove by conventional water treatment methods. Biodegra-dation may be an alternative for its removal from drinking water. Studies were undertaken to determine the conditions enhancing MIB degradation and to isolate and identify the bacteria responsible. MIB degraders were enriched using mg/l levels of the compound, in a defined mineral medium, inoculated with water and sediment samples from reservoirs where MIB is seasonally produced. Cultures that degraded MIB were isolated and enumerated. Degradation occurred only in mixed cultures. MIB supported growth as sole carbon source at 1-6.7 mg/l. MIB at 10 µg/l was also degraded in sterile lake water inoculated with washed bacteria. The degradation of MIB at both µg/l and mg/l levels took from 7 days to more than 2 weeks.

Degradation of sulfonamides antibiotics in lake water and sediment

2012 ◽  
Vol 20 (4) ◽  
pp. 2372-2380 ◽  
Author(s):  
Yuan Zhang ◽  
Jian Xu ◽  
Zhenxing Zhong ◽  
Changsheng Guo ◽  
Lei Li ◽  
...  
Keyword(s):  
Lake Water ◽  
Water And Sediment

Increasing lake water and sediment oxygen levels using slow release peroxide

2012 ◽  
Vol 429 ◽  
pp. 317-324 ◽  
Author(s):  
Anne Nykänen ◽  
Heidi Kontio ◽  
Oskari Klutas ◽  
Olli-Pekka Penttinen ◽  
Silja Kostia ◽  
...  
Keyword(s):  
Lake Water ◽  
Slow Release ◽  
Oxygen Levels ◽  
Water And Sediment
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