Work plan for monitor well installation water and sediment sample collection aquifer testing and topographic surveying at the Riverton, Wyoming, UMTRA Project Site

Distribution of chlorophenolic compounds, from a pulp mill, in Lake Bonney, South Australia

Marine and Freshwater Research ◽

10.1071/mf9930825 ◽

1993 ◽

Vol 44 (6) ◽

pp. 825 ◽

Cited By ~ 7

Author(s):

JA Van Leeuwen ◽

BC Nicholson ◽

KP Hayes

Keyword(s):

South Australia ◽

Pulp Mill ◽

Molecular Chlorine ◽

Sample Collection ◽

Sediment Samples ◽

Discharge Point ◽

Water And Sediment ◽

Chlorinated Guaiacols ◽

Effluent Discharge ◽

Chlorinated Catechols

Water and sediment samples from Lake Bonney (south-eastern South Australia) were collected at various distances from the effluent discharge point of a sulfite-based pulp mill and analysed for chlorophenolic compounds. The period of sample collection (July 1991 to January 1992) occurred during a time when bleaching process of the mill was being converted from using molecular chlorine to using hydrogen peroxide. In water samples, the major chlorophenolic compounds detected were 2,4,6-trichlorophenol, tetrachlorocatechol and chlorinated guaiacols. In sediment samples, the major chlorophenolic compounds detected were chlorinated guaiacols and chlorinated catechols. The concentrations of these compounds in lake water generally decreased over the sampling period, corresponding to the decrease in use of molecular chlorine. Concentrations in sediment decreased with increasing distance from the discharge point. The presence of chlorinated guaiacols in water and sediment at a site 17 km from the effluent discharge point indicated that these compounds degrade slowly in the lake. The presence of the chlorinated catechols in sediments at localities where these compounds were not detected in the water suggests that de-0-methylation of adsorbed chlorinated guaiacols occurs and/or that there is preferential adsorption of chlorinated catechols to sediment.

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Spatial–temporal variation of nitrogen and diffusion flux across the water–sediment interface at the hydro-fluctuation belt of Danjiangkou reservoir in China

Water Science & Technology Water Supply ◽

10.2166/ws.2020.044 ◽

2020 ◽

Vol 20 (4) ◽

pp. 1241-1252

Author(s):

Han Wang ◽

Yuping Han ◽

Lide Pan

Keyword(s):

Diffusion Flux ◽

Sample Collection ◽

Sediment Pore Water ◽

Overlying Water ◽

Danjiangkou Reservoir ◽

Water And Sediment ◽

Water Quality Deterioration ◽

Nitrogen Contents ◽

And Diffusion ◽

Sediment Interface

Abstract Based on overlying water and sediment sample collection from 15 sites during July, September, November 2018 and January 2019 in the hydro-fluctuation belt of Danjiangkou reservoir China, the variation of nitrogen (N) was studied. And the concentrations of NH4+-N, NO3−-N and NO2−-N in the sediment, pore water and overlying water were determined to evaluate the diffusion flux across the water–sediment interface. The results showed that the lowest sediment N concentration was 36.54 mg/L in July, and the highest one was 145.93 mg/L in November. Spatially, the sediment N concentrations were higher in tidal soil and loam than in sandy soil. According to the diffusion fluxes of NH4+, NO3− and NO2−, sediments at all sites tend to release N to the overlying water except in the sampling month of November, when the sediment acts as a sink of NO3−. The highest release rates of NH4+-N and NO3−-N were 17.66 mg m−2·d−1 and 80.15 mg m−2·d−1, respectively, which are much higher than the release rate of NO2−-N (0.29 mg m−2·d−1). The findings indicate that hydro-fluctuation belt sediment contributes a lot to the nitrogen contents in the overlying water, and internal pollution is a main reason for the water quality deterioration and even eutrophication.

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