The colorimetric determination of silicate with special reference to sea and natural waters

Mullin, Jennifer; Riley, J.P.

doi:10.1016/s0003-2670(00)87825-3

Cited by 538 publications

(216 citation statements)

References 20 publications

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“…At each steady-state, soluble reactive phosphorus (SRP), nitrate-nitrogen (NN) and soluble silicate in the culture vessels were measured. SRP was measured with the molybdate method (Murphy & Riley 1962) Nitrate was determined via reduction to nitrite according to Elliott & Porter (1971) and available silicon was measured by the method of Mullin & Riley (1955).…”

Section: Methodsmentioning

confidence: 99%

Growth ofCyclotella meneghinianaKutz. II. Growth and cell composition under different growth rates with different limiting nutrient

Shafik

Herodek

Présing

et al. 1997

Ann. Limnol. - Int. J. Lim.

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Section: Methodsmentioning

confidence: 99%

Growth ofCyclotella meneghinianaKutz. II. Growth and cell composition under different growth rates with different limiting nutrient

Shafik

Herodek

Présing

et al. 1997

Ann. Limnol. - Int. J. Lim.

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“…Dissolved reactive silicon concentration (termed silicon (Si) throughout the remaining paper) was determined by reaction with acid ammonium molybdate, followed by a reduction step using an acidified tin (II) chloride solution to form intensely coloured molybdenum compounds, which were quantified spectrophotometrically using a Descrete Analyser (Auto Analyser 2; Seal Analytical, Fareham, UK) (Mullin and Riley, 1955). Nitrate-N concentration was analysed by ion chromatography (Dionex DX500).…”

Section: River Monitoring Programmementioning

confidence: 99%

Identifying multiple stressor controls on phytoplankton dynamics in the River Thames (UK) using high-frequency water quality data

Bowes

Loewenthal

Read

et al. 2016

Science of The Total Environment

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Contact CEH NORA team at noraceh@ceh.ac.ukThe NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. AbstractRiver phytoplankton blooms can pose a serious risk to water quality and the structure and function of aquatic ecosystems. Developing a greater understanding of the physical and chemical controls on the timing, magnitude and duration of blooms is essential for the effective management of phytoplankton development. Five years of weekly water quality monitoring data along the River Thames, southernEngland were combined with hourly chlorophyll concentration (a proxy for phytoplankton biomass), flow, temperature and daily sunlight data from the mid-Thames. Weekly chlorophyll data was of insufficient temporal resolution to identify the causes of short term variations in phytoplankton biomass. However, hourly chlorophyll data enabled identification of thresholds in water temperature (between 9 and 19 o C) and flow (less than 30 m 3 s -1 ) that explained the development of phytoplankton populations. Analysis showed that periods of high phytoplankton biomass and growth rate only occurred when these flow and temperature conditions were within these thresholds, and coincided with periods of long sunshine duration, indicating multiple stressor controls. Nutrient concentrations appeared to have no impact on the timing or magnitude of phytoplankton bloom development, but severe depletion of dissolved phosphorus and silicon during periods of high phytoplankton biomass may have contributed to some bloom collapses through nutrient limitation. This study indicates that for nutrient enriched rivers such as the Thames, manipulating residence time (through removing impoundments) and light / temperature (by increasing riparian tree shading) may offer more realistic solutions than reducing phosphorus concentrations for controlling excessive phytoplankton biomass.

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“…Dissolved reactive silicon concentration was determined by reaction with acid ammonium molybdate, to form yellow molybdosilicic acids. These were then reduced using an acidified tin (II) chloride solution to form intensely coloured silicomolybdenum blues, which were quantified spectrophotometrically using a Descrete Analyser (Auto Analyser 2; Seal Analytical, Fareham, UK) (Mullin and Riley, 1955).…”

Section: Water Quality Analysismentioning

confidence: 99%

Nutrient and light limitation of periphyton in the River Thames: Implications for catchment management

Bowes

Ings

McCall

et al. 2012

Science of The Total Environment

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This version available http://nora.nerc.ac.uk/16072/ NERC has developed NORA to enable users to access research outputs wholly or partially funded by NERC. Copyright and other rights for material on this site are retained by the rights owners. Users should read the terms and conditions of use of this material at http://nora.nerc.ac.uk/policies.html#access NOTICE: this is the author's version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment [434, 201-212 (2012) . Decreasing ambient SRP concentration from 225 µg l -1 to 173 µg l -1 had no effect on periphyton biomass accrual rate or diatom assemblage. Phosphorus limitation became apparent at 83 µg SRP l -1 , at which point a 25 % reduction in periphyton biomass was observed. Diatom assemblage significantly changed when the SRP concentration was reduced to 30 µg l -1 . Such stringent phosphorus targets are costly and difficult to achieve for the River Thames, due to the high population density and intensive agriculture within the Thames basin. Reducing light levels by shading reduced the periphyton accrual rate by 50 %.Providing shading along the River Thames by planting riparian tree cover could be an effective measure to reduce the risk of excessive algal growth. If the ecology of the Thames is to reach the WFD's "good ecological status", then both SRP concentration reductions (probably to below 100 µg l -1 ) and increased shading will be required.

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The colorimetric determination of silicate with special reference to sea and natural waters

Cited by 538 publications

References 20 publications

Growth ofCyclotella meneghinianaKutz. II. Growth and cell composition under different growth rates with different limiting nutrient

Growth ofCyclotella meneghinianaKutz. II. Growth and cell composition under different growth rates with different limiting nutrient

Identifying multiple stressor controls on phytoplankton dynamics in the River Thames (UK) using high-frequency water quality data

Nutrient and light limitation of periphyton in the River Thames: Implications for catchment management

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