scholarly journals LAKE WATER AND SEDIMENT. VII. CHEMICAL AND OPTICAL PROPERTIES OF WATER IN RELATION TO THE BACTERIAL COUNTS IN THE SEDIMENTS OF TWENTY-FIVE NORTH AMERICAN LAKES1

1964 ◽  
Vol 9 (1) ◽  
pp. 35-41 ◽  
Author(s):  
E. H. Anthony ◽  
F. R. Hayes
Keyword(s):  
Optical Properties ◽  
Lake Water ◽  
North American ◽  
Bacterial Counts ◽  
Water And Sediment

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.

scholarly journals Impact of North American intense fires on aerosol optical properties measured over the European Arctic in July 2015

2016 ◽  
Vol 121 (24) ◽  
pp. 14,487-14,512 ◽  
Author(s):  
K. M. Markowicz ◽  
P. Pakszys ◽  
C. Ritter ◽  
T. Zielinski ◽  
R. Udisti ◽  
...  
Keyword(s):  
Optical Properties ◽  
North American ◽  
Aerosol Optical Properties ◽  
European Arctic

scholarly journals Bacteriological and heavy metal assessment of a tropical crude oil- polluted soil, water and sediment

2021 ◽  
Vol 16 (2) ◽  
pp. 159-165
Author(s):  
Maryjoy Chidinma Maduwuba ◽  
Gideon Chijioke Okpokwasili ◽  
Abiye Anthony Ibiene
Keyword(s):  
Heavy Metals ◽  
Crude Oil ◽  
Soil Water ◽  
Biochemical Characterization ◽  
Polluted Soil ◽  
Contaminated Site ◽  
Bacterial Counts ◽  
Sediment Samples ◽  
Pseudomonas Spp ◽  
Water And Sediment

Crude oil-polluted environment serves as a reservoir of microbial species, especially bacteria. Determining these bacterial genera is of great benefit to environmental assessment and recovery. This study evaluated the bacteria and selected heavy metals present in crude oil-polluted sites in K-dere community, Ogoniland. The study was carried out at the Department of Microbiology, University of Port Harcourt, Rivers State, Nigeria. Crude oil-polluted soil, water, and sediment samples were collected from K-dere community, Ogoniland. The pH and heavy metals composition of each sample was determined using pH meter and spectrophotometer, respectively, while isolation and biochemical characterization were done to evaluate the heterotrophic and hydrocarbon utilizing bacteria present in each sample. Results revealed that iron (Fe) had the highest concentration in the soil (898.77±0.022 mg/kg) and sediment (1556.7±0.163 mg/kg) samples, while lead (Pb) had the lowest overall concentration. The concentration of total petroleum hydrocarbon (TPH) (10410.5 mg/kg) in soil sample exceeded the DPR standard limit of 5000 mg/kg for soil. The results of total culturable heterotrophic bacterial counts (TCHBC) and total culturable hydrocarbon utilizing bacterial counts (TCHUBC) showed that soil and sediment samples had the highest TCHBC and TCHUBC values of 2.66 ± 0.03 x 108 CFU/mL and 4.7 ± 0.14 x 107 CFU/mL respectively. Morphological and biochemical characterization of the isolates revealed the presence of Pseudomonas spp, Bacillus spp, Acidiphilium spp, Mycobacterium spp and Leptospirillum spp in the samples with Pseudomonas spp having the highest percentage occurrence. This study has revealed the presence of useful bacterial species in the sampled sites which can be harnessed for an in situ cleaning of crude oil- contaminated site, especially in the tropical region.

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

Changes in water microbial quality during bank filtration of lake water

1997 ◽  
Vol 43 (12) ◽  
pp. 1126-1132 ◽  
Author(s):  
Ilkka T. Miettinen ◽  
Terttu Vartiainen ◽  
Pertti J. Martikainen
Keyword(s):  
Organic Carbon ◽  
Lake Water ◽  
Heterotrophic Bacteria ◽  
Sampling Point ◽  
Microbial Quality ◽  
Bank Filtration ◽  
Bacterial Counts ◽  
Microbial Stability ◽  
Stability Of Water ◽  
Microbial Numbers

We studied, during a 2-year period, how the microbial stability of water changed when humus-rich lake water was filtered through the ground at a bank filtration water plant. The changes in microbial quality were followed as microbial numbers and growth activity. The filtration decreased microbial counts and growth ([3H]thymidine technique) in water up to 90%. The reduction in bacterial counts and growth depended on the filtration distance. The reduction was greatest between the lake and the first sampling point. Microbial numbers and growth declined steadily after infiltration with increased filtration distance. Viable counts of heterotrophic bacteria decreased faster than total bacterial counts along filtration. The microbial numbers and bacterial production in water followed seasonal changes in water temperature. Simultaneously with the microbial numbers, the concentrations of total organic carbon and assimilable organic carbon decreased during bank filtration. These results showed that microbial stability of humus-rich water was increased by filtration to a level generally found in natural groundwaters.Key words: bacteria, bank filtration, biological stability, drinking water, groundwater.

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
Sign in / Sign up

Export Citation Format

Share Document