Silica and Phosphorus Flux from Sediments: Importance of Internal Recycling in Lake Michigan

1988 ◽  
Vol 45 (6) ◽  
pp. 1030-1035 ◽  
Author(s):  
Daniel J. Conley ◽  
Michael A. Quigley ◽  
Claire L. Schelske
Keyword(s):  
Lake Michigan ◽  
Water Mass ◽  
Sediment Cores ◽  
Soluble Reactive Phosphorus ◽  
Dissolved Silica ◽  
Sediment Fluxes ◽  
Species Succession ◽  
Reactive Phosphorus ◽  
Annual Primary Production ◽  
Total P

Estimated lake-wide sediment fluxes of silica and phosphorus (P) were determined and then compared with other components in the biogeochemical cycle to investigate the importance of sediment regeneration in Lake Michigan. Dissolved silica (Si) and soluble reactive phosphorus (SRP) fluxes from sediments were measured by the incubation of intact sediment cores. Estimated Si flux from sediments can supply 21% of the total mass of silica in the water annually and 26% of the Si used during annual diatom production. By contrast, estimated SRP flux from lake sediments can supply only 4.1% of the mass of total P in the water annually and <1% of the P utilized for annual primary production. Because the internal regeneration of P occurs rapidly in the water column, compared with the much slower regeneration of Si (0.8∙yr−1), P can be used many times during an annual cycle whereas Si is used only once. Thus, differences in the supply rates and in the biogeochemical recycling rates of Si and P can lead to seasonal Si depletion in the water mass and influence the outcome of seasonal phytoplankton species succession by limiting Si availability necessary for diatom production.

A Comparison of Different Phosphorus Fractions as Predictors of Particulate Pigment Levels in Lake Memphremagog and its Tributaries

1982 ◽  
Vol 39 (5) ◽  
pp. 785-790 ◽  
Author(s):  
Robert Henry Peters ◽  
Martin Bergmann
Keyword(s):  
Molecular Weight ◽  
Soluble Reactive Phosphorus ◽  
Particulate Material ◽  
Phosphorus Fractions ◽  
Particulate Phosphorus ◽  
Small Molecular Weight ◽  
Large Molecular Weight ◽  
Reactive Phosphorus ◽  
Lake Waters ◽  
Total P

The amounts of colored particulate material (measured by reflectance) in surface waters of Lake Memphremagog and its tributaries were regressed against concentrations of total phosphorus and several of its component fractions: soluble phosphorus, particulate phosphorus, soluble reactive phosphorus, orthophosphate, large molecular weight phosphorus (> 5000 mol wt) and small molecular weight phosphorus (< 400 mol wt). The correlations were examined to see if one of these fractions was a better predictor of seston concentration, and presumably of other biologically related lake properties, than total P, and to determine if riverine samples differed from lake waters in the relation between concentrations of P and suspended particulates. Total P correlated with colored particulates in both lotic and lentic samples as well as or better than any other fraction. Although river samples showed greater variation than lake samples, the regression lines describing the relations were similar in both lakes and rivers.Key words: phosphorus fractions, lakes, rivers, empirical models, particulate concentration, seston

Soluble Reactive Phosphorus Measurements in Lake Michigan: Filtration Artifacts

1982 ◽  
Vol 8 (3) ◽  
pp. 550-557 ◽  
Author(s):  
Stephen J. Tarapchak ◽  
Sylvia M. Bigelow ◽  
Cora Rubitschun
Keyword(s):  
Lake Michigan ◽  
Soluble Reactive Phosphorus ◽  
Reactive Phosphorus

Overestimation of Orthophosphorus Concentrations in Surface Waters of Southern Lake Michigan: Effects of Acid and Ammonium Molybdate

1982 ◽  
Vol 39 (2) ◽  
pp. 296-304 ◽  
Author(s):  
Stephen J. Tarapchak ◽  
Sylvia M. Bigelow ◽  
Cora Rubitschun
Keyword(s):  
Surface Waters ◽  
Extraction Method ◽  
Time Course ◽  
Lake Michigan ◽  
Soluble Reactive Phosphorus ◽  
Particulate Material ◽  
Ammonium Molybdate ◽  
Molybdenum Blue ◽  
P Release ◽  
Reactive Phosphorus

Water from southern Lake Michigan was analyzed to determine if orthophosphorus (PO4-P) concentrations are overestimated by molybdenum blue methods and to assess the potential effects of ammonium molybdate on soluble reactive phosphorus (SRP) determinations. Time-course "hydrolysis" tests, based on the Chamberlain–Shapiro extraction method, showed that large amounts of PO4-P were released from bound sources into solution within seconds after acid molybdate was added, and that molybdate-reactive PO4-P could be retained by filters or released from particulate material into filtrates during filtration. PO4-P concentrations obtained by using the prescribed exposure of 30 s were overestimated minimally by up to 86%, and ammonium molybdate dramatically accelerated PO4-P release in filtered samples. Tests using up to a fourfold range in ammonium molybdate concentrations also showed that the extraction method and Harvey's method yielded SRP values that varied two- to three-fold or more, and that most of the PO4-P was released from "particles" in filtrates. Analytical methods, therefore, can yield substantially different SRP estimates because of differences in the length of time samples are exposed to acid molybdate and because of differences in molybdate concentrations.Key words: ammonium molybdate, hydrolysis, phosphorus, soluble reactive phosphorus, orthophosphorus

Soluble Reactive Phosphorus Measurements in Lake Michigan: Causes of Method-Specific Differences

1982 ◽  
Vol 8 (4) ◽  
pp. 700-710 ◽  
Author(s):  
Stephen J. Tarapchak ◽  
Richard L. Chambers ◽  
Sylvia M. Bigelow
Keyword(s):  
Lake Michigan ◽  
Soluble Reactive Phosphorus ◽  
Reactive Phosphorus

scholarly journals Effects of Lanthanum Modified Bentonite and Polyaluminium Chloride on the Environmental Variables in the Water and Sediment Phosphorus Form in Lake Yanglan, China

Water ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 1947
Author(s):  
Ling Su ◽  
Chen Zhong ◽  
Lei Gan ◽  
Xiaolin He ◽  
Jinlei Yu ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Soluble Reactive Phosphorus ◽  
Particulate Phosphorus ◽  
Modified Bentonite ◽  
Combined Application ◽  
Water And Sediment ◽  
Phosphorus Form ◽  
Labile P ◽  
Reactive Phosphorus ◽  
Polyaluminium Chloride

The application of lanthanum modified bentonite (Phoslock®) and polyaluminium chloride (PAC) is popular in the restoration of European temperate lakes; however, the effects of the application on the concentrations of phosphorus (P) in both the water and the sediments have been poorly evaluated to date. We studied the effects of the application of Phoslock® + PAC on the concentrations of total phosphorus (TP), particulate phosphorus (PP), soluble reactive phosphorus (SRP), total suspended solids (TSS) and chlorophyll a (Chla) in the water, and different P forms in the sediments, in an isolated part of Lake Yanglan. The results showed that the concentrations of TP, PP, SRP, TSS and Chla decreased significantly after the addition of Phoslock® + PAC. Moreover, the concentrations of labile-P, reductant-soluble-P and organic-P in the sediments were also significantly decreased after the Phoslock® + PAC application. However, the concentrations of both the stable apatite-P and residual-P in the sediments after application of Phoslock® + PAC were much higher than the pre-addition values, while the concentrations of metal-oxide-P did not differ significantly between the pre- and post- application conditions. Our findings imply that the combined application of Phoslock® and PAC can be used in the restoration of subtropical shallow lakes, to reduce the concentrations of P in the water and suppress the release of P from the sediments.

scholarly journals Seasonal Variations of Phosphorus Species in the Overlying and Pore Waters of the Tuohe River, China

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Qing Xu ◽  
Xiaoping Yu ◽  
Yafei Guo ◽  
Tianlong Deng ◽  
Yu-Wei Chen ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Yangtze River ◽  
Algal Bloom ◽  
Soluble Reactive Phosphorus ◽  
Pore Waters ◽  
Phosphorus Species ◽  
Dissolved Phosphorus ◽  
Vertical Distributions ◽  
Reactive Phosphorus ◽  
Main Factor

Overlying sediment and pore waters were collected in summer and winter at upstream (Jintang) and downstream (Neijiang) sites of the Tuohe River, which is one of the five largest tributaries of the Yangtze River in China. Phosphorus species, including soluble reactive phosphorus (SRP), soluble unreactive phosphorus (SUP), and total dissolved phosphorus (TDP), and some diagenetic constituents including dissolved Fe(II), Mn(II), and sulfide in overlying and pore waters, were measured systematically. The seasonal variations and vertical distributions of phosphorus species in overlying and pore waters at both sampling sites were obtained to elucidate some aspects of the transport and transformations of phosphorus. Based on the profiles of pore and overlying waters as well as the TDN/TDP data during an algal bloom in 2007, it was clearly demonstrated that phosphorus was the main factor limiting the phytoplankton growth in the Tuohe River.

Impact of hydro-sedimentary processes on the dynamics of soluble reactive phosphorus in the Seine River

2014 ◽  
Vol 122 (2-3) ◽  
pp. 229-251 ◽  
Author(s):  
Lauriane Vilmin ◽  
Najla Aissa-Grouz ◽  
Josette Garnier ◽  
Gilles Billen ◽  
Jean-Marie Mouchel ◽  
...  
Keyword(s):  
Soluble Reactive Phosphorus ◽  
Sedimentary Processes ◽  
Seine River ◽  
Reactive Phosphorus

Changes in Nutrient Levels of Lake Water Stored at 4 °C

1984 ◽  
Vol 41 (6) ◽  
pp. 985-988 ◽  
Author(s):  
A. H. El-Shaarawi ◽  
M. A. Neilson
Keyword(s):  
Statistical Analysis ◽  
Lake Water ◽  
Water Samples ◽  
Soluble Reactive Phosphorus ◽  
Lake Ontario ◽  
The Other ◽  
Nutrient Levels ◽  
Glass Bottles ◽  
Reactive Phosphorus

Water samples were collected on Lake Ontario during April and November, filtered (0.45 μm), and immediately analyzed onboard ship for the nutrients soluble reactive phosphorus, nitrate-plus-nitrite, and ammonia. Replicates were stored in glass bottles at 4 °C and reanalyzed within 8 d. Statistical analysis showed that soluble reactive phosphorus decreased by 11 and 13% and nitrate-plus-nitrite by 7 and 6%, whereas ammonia increased by 75% on one cruise and decreased by 37% on the other.

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