A Single-Solution Method for the Determination of Soluble Phosphate in Sea Water

Murphy, Jennifer E.; Riley, J.P.

doi:10.1017/s0025315400014776

Cited by 206 publications

(103 citation statements)

References 6 publications

(6 reference statements)

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“…Total phosphorus was detcrmined by the method of Murphy and Riley ( 1958) following digestion of the samples (5-15 mg) for 1.5-2 hr with 1.4 ml of concentrated 11$04. The maximum deviation from the mean phosphorus content of six replicate samples of "other Crustacca" collected in January was 3.3%.…”

Section: Phosphorusmentioning

confidence: 99%

Studies on the Chemical Composition of the Major Zooplankton Groups in the Sargasso Sea Off Bermuda1

Beers

1966

Limnology & Oceanography

195

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A one year study was made of the carbon, nitrogen, phosphorus, and carbohydrate content of the major zooplankton groups from the surface to 500 m in the Sargasso Sea off Bermuda. Carbon content ranged from the yearly average of 41.6% of the dry weight of copepods to as low as 7.2% in the siphonophores. Nitrogen varied from approximately 9–11% of the dry weight of organisms with a low wet to dry weight ratio; 1–4% in the watery forms; and 6–8% in intermediate groups such as the chaetognaths. Average yearly phosphorus levels ranged from 1.48% of the dry weight in the euphausids‐mysids to 0.14% in siphonophores. Carbohydrate content of all groups was low, averaging less than 1% of the dry weight.

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Section: Phosphorusmentioning

confidence: 99%

Studies on the Chemical Composition of the Major Zooplankton Groups in the Sargasso Sea Off Bermuda1

Beers

1966

Limnology & Oceanography

195

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“…La determinación de nitritos se realizó siguiendo el método colorimétrico, descrito por [8] ; para los nitratos se empleó el método colorimétrico de reducción con cadmio-cobre, descrito por [9], y para fosfatos el método del ácido ascórbico de [10]. La determinación de oxígeno disuelto se realizó aplicando el método yodométrico 4500-O B, descrito en el Standard …”

Section: Parámetros Microbiológicos Y Fisicoquímicosunclassified

Caracterización microbiológica y fisicoquímica del agua de lastre de buques de tráfico internacional que arribaron al puerto de Tumaco durante 2013

Gutiérrez¹,

Bastidas²,

Rosero³

2014

BCCIOH

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3Parada-Gutiérrez JL, Payán-Bastidas CI, Casanova-Rosero, RF. Caracterización microbiológica y fisicoquímica del agua de lastre de buques de tráfico internacional que arribaron al puerto de Tumaco durante 2013. Bol. Cient. CIOH 2014;32:211-222. RESUMENEn el presente estudio se evaluaron los niveles microbianos para los indicadores coliformes totales, coliformes fecales (Escherichia coli), Enterococcus spp y el agente patógeno Vibrio spp. Así mismo para algunas variables fisicoquímicas (pH, temperatura, conductividad, salinidad, nutrientes y oxígeno disuelto) con base en el monitoreo realizado al agua contenida en los tanques de lastre de once (11) buque-tanques de tráfico marítimo internacional, que arribaron al Terminal Multiboyas de Ecopetrol de Tumaco durante 2013. Los resultados microbiológicos revelaron la presencia de indicadores bacterianos en todos los tanques de lastre: en el 73.9 % de los tanques el recuento microbiano para el grupo coliformes sobrepasó las 250 UFC/100ml y el género Enterococcus spp excedió las 100 UFC/100ml en el 8.7 %. Asimismo se registró la presencia del género Vibrio spp en el 52.2 % de los tanques examinados. Esto implica que el agua de lastre evaluada, la cual es descargada en la bahía, genera un riesgo potencial tanto para el ecosistema marino como para la salud humana, constituyendo un vector para la introducción de especies invasoras y organismos patógenos. Los niveles de las variables fisicoquímicas se encontraron dentro de los intervalos reportados para la bahía de Tumaco y, por ende, no alteran las características del agua de la bahía.PALABRAS CLAVES: agua de lastre, bahía de Tumaco, indicadores bacterianos, Pacífico colombiano, parámetros fisicoquímicos. ABSTRACTIn the present study microbial levels for total coliforms, fecal coliforms (Escherichia coli), Enterococcus spp and Vibrio spp pathogen indicators were evaluated; likewise, some physicochemical variables (pH, temperature, conductivity, salinity, nutrients and dissolved oxygen) were determined from monitoring carried to the water in the ballast tanks of 11 tankers of international maritime traffic, arrived on Ecopetrol Terminal in Tumaco during 2013. The microbiological results revealed the presence of bacterial indicators in all ballast tanks; in 73.9% of the tanks, the microbial count for coliform group surpassed the 250 CFU/100 mL; the genus Enterococcus spp exceeded 100 CFU/100 mL at 8.7%. Also, the presence of Vibrio spp in 52.2% of examined tanks were recorded. This implies that the tested ballast water, which is discharged in the bay, can be considered a risk to the marine ecosystem and to human health, becoming a vector for the introduction of invasive species and pathogens. The levels of physicochemical variables were within the ranges reported for the Tumaco Bay and therefore do not alter the characteristics of the water in the bay.

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“…Volatile suspended solids were calculated from the difference in pre-and postignition of the dried half-filter weights. Water samples were analyzed for NO 3 --N and NH 4 + -N dissolved reactive phosphate (DRP) colorimetrically (Murphy and Riley 1958), and DOC on a Dohrmann Phoenix 8000 UV-persulfate oxidation analyzer (Tekmar-Dohrmann, Cincinnati, Ohio).…”

Section: Figurementioning

confidence: 99%

Assessment of best management practices for nutrient cycling: A case study on an organic farm in a Mediterranean-type climate

Smukler¹,

O’Geen²,

Jackson³

2012

Journal of Soil and Water Conservation

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Abstract:The effectiveness of best management practices (BMPs) designed primarily to protect surface water quality was assessed on a farm certified for organic tomato production to consider potential environmental quality and production tradeoffs. The BMPs included winter cover crops typically used in organic farming to cycle nutrients and reduce stormwater runoff; tailwater ponds designed to capture runoff; and tailwater return systems, which recycle runoff back to the field. The study took place at a 44 ha (108 ac) farm in Yolo County, California, over a two-year period. Monitoring throughout the winter rainy season showed cover crops successfully reduced runoff and loads of several constituents during the storm events, when compared to fallow. Total discharge was reduced by 44%, total suspended solids was reduced by 83%, ammonium was reduced by 33%, and dissolved organic carbon (DOC) was reduced by 58%. Estimates of leaching losses of DOC in the cover cropped fields, however, were 70% higher than the fallow fields in the winter rainy season and were 30% higher than the fallow fields in the summer irrigation season. During the summer irrigation season, the tailwater pond alone was highly effective in reducing losses of total suspended solids and volatile suspended solids to the neighboring riparian zone by 97% and 89%, respectively. The tailwater pond had no effect on dissolved reactive phosphorous and actually increased concentrations of nitrate-nitrogen (NO 3 --N) in effluent by 40% and DOC by 20%. As was expected, the NO 3 --N leaching measured by anion exchange resin bags and nitrous oxide emissions measured by static closed chambers was higher for the tailwater pond than the fallow field. Despite these differences, losses via NO 3 --N leaching and nitrous oxide emissions accounted for only 24.7 and 0.48 kg N ha -1 y -1 (22.0 and 0.40 lb N ac -1 ), respectively, for the entire farm, even including ponds and ditches. When field and plot values were extrapolated to the entire tomato production area to understand the relative potential tradeoffs, results indicate that BMPs could be implemented without an impact on tomato marketable yields; the tailwater pond's higher nitrous oxide emissions would not significantly increase the overall emissions for tomato production given its relatively small size; and using tailwater ponds in combination with cover crops would decrease total suspended solids (TSS) losses compared to cover crops alone, with only minor increases in NO 3 --N and DOC losses. Adding a tailwater return system to this combination of BMPs could help minimize these NO 3 --N and DOC losses. Use of cover crops with a tailwater pond and tailwater return system are a combination of BMPS that can thus be recommended for organic production when considering multiple environmental outcomes.

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A Single-Solution Method for the Determination of Soluble Phosphate in Sea Water

Cited by 206 publications

References 6 publications

Studies on the Chemical Composition of the Major Zooplankton Groups in the Sargasso Sea Off Bermuda1

Studies on the Chemical Composition of the Major Zooplankton Groups in the Sargasso Sea Off Bermuda1

Caracterización microbiológica y fisicoquímica del agua de lastre de buques de tráfico internacional que arribaron al puerto de Tumaco durante 2013

Assessment of best management practices for nutrient cycling: A case study on an organic farm in a Mediterranean-type climate

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