Showing results for: chlorophyll monitoring Articles
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When Should I Use a Red Excitation Configuration?
When measuring chlorophyll levels using the C-FLUOR, a red excitation configuration is recommended for use in aquatic habitats that have high dissolved organics. Unlike blue excitation, red excitation does not have as much interference from dissolved organic matter (DOM) because DOM particles absorb blue excitation energy, not red. Also, a red excitation configuration is more sensitive to ...
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When Should I Use a Blue Excitation Configuration?
When measuring chlorophyll levels using the C-FLUOR, a red excitation configuration is recommended for use in aquatic habitats that have high dissolved organics. Unlike blue excitation, red excitation does not have as much interference from dissolved organic matter (DOM) because DOM particles absorb blue excitation energy, not red. Also, a red excitation configuration is more sensitive to ...
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A comparison of two techniques for nondestructive measurement of chlorophyll content in grapevine leaves
Traditional methods for chlorophyll (Chl) measurement include wet chemical extractions and handheld Chl meters. The recent availability of small and affordable radiometers has provided means to estimate Chl from reflectance measurements. This paper compares the performance of a handheld SPAD Chl meter and a recently developed Red Edge Chlorophyll Index (CIred edge) for Chl estimation in grapevine ...
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Luxury production of leaf chlorophyll and mid-season recovery from nitrogen deficiencies in corn
Deficiencies of N during the growth of corn (Zea mays L.) are often diagnosed by using chlorophyll meters that measure chlorophyll content in leaves. The diagnoses are based on the assumption that above-optimal supplies of N do not significantly influence chlorophyll meter readings (CMRs). The objective of this research was to assess the possibility that above-optimal supplies of N impacted ...
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Parameter estimation for eutrophication models in reservoirs
Excessive eutrophication is a major water quality issue in lakes and reservoirs worldwide. This complex biological process can lead to serious water quality problems. Although it can be adequately addressed by applying sophisticated mathematical models, the application of these tools in a reservoir management context requires significant amounts of data and large computation times. This work ...
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Dewatering as a non-toxic control of nuisance midge larvae in algal wastewater treatment floways
Attached-algae floways have tremendous potential for use in wastewater treatment because natural algal communities show high nutrient removal efficiencies, have low operating costs, and are easy to maintain. Algal wastewater floways may also serve as a sustainable option for producing renewable energy because algae grow rapidly, are easily harvested, and can serve as a source of biomass for ...
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Monitoring of phytoplankton biomass and nutrients in a polluted stream
The spatial and temporal variations in the concentrations of nutrients (NH4+, NO2−, PO43−, SiO4−) and chlorophyll a were monitored simultaneously in a slow-flowing watercourse (Saricay Stream, Turkey), which runs in a ruralurban gradient. Chlorophyll a concentrations ranged between 0.044 g l-1 and 206.15 g l-1 and, in general, the higher concentrations of chlorophyll a and ammonium were measured ...
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Dynamic Ressource Management: Contribution of the Chlorophyll-a Monitoring in Karstic Systems - Case Study
Main goals: Characterize a karst system exploited by springs and wells Characterize the surface karst water connections Results: Well on the Drain Annex System (DAS) Sping on the main karstic Drain (D) Opportunities: Inversion monitoring (estavelle) and dynamic pumping management in karstic systems ...
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Oxygen deoxygenation sensor has the following characteristics
Background:Water dissolved oxygen sensor is a device used to measure water quality, usually consisting of multiple sensors and measuring systems. The principle of water dissolved oxygen sensor is to calculate various substances in the water, such as pH value and chlorophyll, by measuring the dissolved oxygen content in the water, and combining the temperature, turbidity and other indicators. ...
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Creeping bentgrass color and quality, chlorophyll content, and thatch–mat accumulation responses to summer coring
Coring is a common cultural practice used on golf courses. The reported effects of coring alone on thatch–mat accumulation have been mixed. The objectives of this field study were to examine the effects of spring and summer coring on thatch–mat thickness and organic matter accumulation in creeping bentgrass (Agrostis stolonifera L.). Turfgrass color and quality and chlorophyll content were also ...
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The Cause and Effect of Harmful Algal Blooms
Management of Cyanobacteria Harmful Algal Blooms The California Lake Management Society (CALMS) is a non-profit organization that works to manage lakes and reservoirs throughout California. In April of 2023, Precision Measurement Engineering (PME) had the privilege of attending a webinar hosted by CALMS. Guest presenter Rick Almalfi, Vice President at Aquatic Consulting & Testing Inc, ...
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The Cause and Effect of Harmful Algal Blooms
Management of Cyanobacteria Harmful Algal Blooms The California Lake Management Society (CALMS) is a non-profit organization that works to manage lakes and reservoirs throughout California. In April of 2023, Precision Measurement Engineering (PME) had the privilege of attending a webinar hosted by CALMS. Guest presenter Rick Almalfi, Vice President at Aquatic Consulting & Testing Inc, ...
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In-situ quality monitoring station in Lower Saxony
Background 'Duemmer' is a shallow lake in the south-west of Lower Saxony; through the lake flows the river 'Hunte'. The catchment area spans 426 km2. With a surface of 12.4 km2 and an average depth of 1.1 m there is a water volume of approx. 14 million m3. Large parts of the lakeside are a nature reserve and the lake is a popular local recreation area. The lake suffers from strong nutrient ...
By OTT HydroMet
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Determination of Chlorophyll Content in Rapeseed by Spectrophotometry
Rapeseed is an important oil crop in my country, and rapeseed oil is one of the important edible oils in China. The chlorophyll content in rapeseed oil directly affects the oil processing cost and the shelf life of the oil. This article refers to "GB/T 22182-2008/ISO 10519:1997 Rapeseed Chlorophyll Content Determination Spectrophotometer Method" and "NY/T 1287-2007 Rapeseed Chlorophyll Content ...
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FTIR spectroscopy as a novel approach towards providing effect‐based endpoints in duckweed toxicity testing
Traditional duckweed toxicity tests only measure plant growth inhibition as an endpoint, with limited effects‐based data. This study aimed to investigate whether Fourier‐transform infrared (FTIR) spectroscopy could enhance the duckweed (Lemna minor L.) toxicity test. Four chemicals (Cu, Cd, atrazine, and acetochlor) and four metals‐containing industrial wastewater samples were tested. After ...
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Studying the Effects of Climate Change on Marine Life
The Acidification Nearshore Monitoring Network (ANeMoNe) has been studying the effects of oceanic warming and acidification on marine life across various sites in Washington State. Warmer waters hold less oxygen than cooler waters which can lead to mass deaths of crabs, fish, and other aquatic animals. Acidification occurs when freshwater enters the saltwater, and since climate change is ...
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Algae Bloom Detection for Desalination Plants
Despite the fact that water covers 70 percent of the planet, a mere 3 percent of that water is fresh. Most of the planet’s freshwater is not readily available. The water systems that perpetuate ecosystems are stressed by a growing human population, disappearing wetlands, agricultural consumption and droughts related to climate change. At present, 14 of the world’s 20 largest cities ...
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Analysis of nitrogenous and algal oxygen demand in effluent from a system of aerated lagoons followed by polishing pond
In this descriptive-analytical study, nitrogenous and algal oxygen demand were assessed for effluent from a system of facultative partially mixed lagoons followed by the polishing pond using 120 grab samples over 1 year. Filtered and non-filtered samples of polishing pond effluent were tested in the presence and absence of a nitrification inhibitor. Effective factors, including 5-day ...
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Effects of nitrogen and potassium on wear mechanisms in perennial ryegrass: i. wear tolerance and recovery
Fertility may influence wear tolerance and recovery, but its effects on perennial ryegrass (Lolium perenne L.) are unknown. Our objective was to evaluate the effects of nitrogen (N) and potassium (K) on wear tolerance and recovery in perennial ryegrass. Field studies were conducted in 2006 and 2007 to evaluate five rate levels of N (49, 147, 245, 343, and 441 kg ha–1 yr–1) with three rate levels ...
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Effects of maturity on chlorophyll-related absorption in nectarines, measured by non-destructive time-resolved reflectance spectroscopy
The ripening of fruits like nectarines and peaches is characterised by the decrease in chlorophyll content or colour of the fruit flesh. However, measuring the colour of fruit flesh is usually not conducted, as there is a lack of suitable techniques. Time-Resolved Reflectance Spectroscopy (TRS) is a novel technique that can measure the light absorbed by the fruit flesh. Using a laser light beam ...
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