Automatic method for the determination of ortho-phosphate and total dissolved phosphorus in the marine environment

Eberlein, K.; Kattner, Gerhard

doi:10.1007/bf00469784

Cited by 92 publications

(42 citation statements)

References 6 publications

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“…Prior to analysis the collected samples were filtered through a 0.45-micron polycarbonate filter and the suspended sediment filtered was oven dried and weighed. Phosphate (soluble reactive phosphorus, SRP) was determined according to the methods of Eberlein & Kattner (1987), which are based on the original method with molybdenum blue; ammonium and nitrate were determined according to Treguer & Le Corre (1975); and nitrite was determined by the Grasshoff method (1983). In the first survey, ammonium was only measured at sites 7 and 8.…”

Section: Field and Laboratory Methodsmentioning

confidence: 99%

The impact of agricultural land use on stream chemistry and inputs to an inland reservoir: case of the Sauce Grande River, Argentina

Orioli

Sabbatini

Marchena

et al. 2008

Hydrological Sciences Journal

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Water quality in the Paso Piedras Reservoir has deteriorated, primarily due to periodic blue-green algal blooms, making it temporarily unfit for human consumption. This phenomenon results from the eutrophication of waters of the watershed, and nutrients are considered to be the primary contributors to degradation of freshwater quality. In order to reduce the levels of nitrogen and, most of all, phosphorus, entering the Paso Piedras Reservoir, it is necessary to understand the incidence of diffuse transfers of nutrients from agricultural soils. The nitrogen composition, soluble reactive phosphorus (SRP) and other physico-chemical parameters of the water were analysed in various different parts of the watershed in order to characterize water input to the reservoir from areas with different anthropogenic activity. The upper Sauce Grande basin was divided into three areas with different edaphic characteristics. The physico-chemical parameters measured in sampling surveys included: SRP, ammonium and nitrate, pH, conductivity, turbidity, and total solids. The results showed that the water of the Sauce Grande (areas 1 and 2) was not strongly contaminated, but in El Divisorio (Area 3, which is a sub-watershed whose stream flows directly into the Paso Piedras Reservoir), the levels of conductivity, total suspended sediments and SRP were so high that its contribution to the reservoir accounts for nearly 50% of the total SRP input. The main characteristics of El Divisorio watershed that make it a diffuse source of SRP were not only that its soils, under agriculturallivestock production, have significant slopes, so that water and wind erosion are faster, but also that human intervention had caused the destruction of aggregates. The results showed the influence of the soil characteristics, production systems and the micro-environment developed in the reservoir on the characteristics of waters flowing out of the reservoir. The two villages located in Area 2 had no significant influence on the concentration of nitrogen compounds and SRP found downstream.

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Section: Field and Laboratory Methodsmentioning

confidence: 99%

The impact of agricultural land use on stream chemistry and inputs to an inland reservoir: case of the Sauce Grande River, Argentina

Orioli

Sabbatini

Marchena

et al. 2008

Hydrological Sciences Journal

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“…The automated procedures for nitrate and nitrite analyses were based on the methods of Armstrong et al (1967). Determination of phosphate followed the method of Murphy & Riley (1962) with modifications by Eberlein & Kattner (1987). Reactive silicate was measured as described in Grasshoff et al (1983).…”

Section: Methodsmentioning

confidence: 99%

Nutrient regimes in the marginal ice zone of the Greenland Sea in summer

Spies¹,

Brockmann²,

Kattner³

1988

Mar. Ecol. Prog. Ser.

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The surface layer (150n1) nutnent distribution (nitrate and nitrite, phosphate, silicate, ammonium) in the ice edge zone of Fram Strait was investigated during summer 1984 as part of the Marginal Ice Zone Experiment (MIZEX '84). The position of the ice edge was determined by the hydrography of the region, i. e the different water masses typical of the Greenland Sea (Polar Water. Atlantic Water and Intermediate Water). Nutrient concentrations reflected the different types of water Nutrient dstribution was characterized by strong vertical stratification and large gradients at water mass boundaries. Nutrient minima were correlated with high biomass concentrations in stratified surface waters. At frontal boundaries elevated chlorophyll a values were associated with abundant nutrients. Along 5 transects through the ice edge zone, distinct ammonium maxima were found at the depth of the chlorophyll a maximum or slightly below it. The results suggest that at least 3 different nutrient regimes can b e distinguished in the surface layer of the Greenland Sea ice edge zone.

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“…Luebbe) flow-through spectrophotometric apparatus using standard procedures (Jones 1984;Slawyck and McIsaac 1972): ammonium reacted with salicylate and dichloro-isocyanuric acid, using nitroprusside as a catalyst, to produce a blue compound measured at 660 nm; nitrite reacted under acidic conditions with sulfanilamide to form a diazo-compound that then couples with N-(1-naphtyl)-ethylenediamine to form a reddish-purple azo-dye that is measured at 550 nm; nitrate was determined after reduction into nitrite. Ortho-phosphate from filtered water samples was reacted with molybdate and ascorbic acid in the presence of antimony potassium tartrate to form a blue compound measured at 880 nm; total P was determined on unfiltered water after sodium persulfate digestion and mineralization at 110°C in an acidic phase (Eberlein and Katter 1984). Dissolved silica (DSi) was determined by spectrophotometry and analyzed from filtered water samples (Rodier 1984).…”

Section: Dissolved Elementsmentioning

confidence: 99%

N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea

et al. 2010

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The Red River Delta (RRD) (Vietnam), a region experiencing rapid population growth, industrialization, and economic development, concentrates 54% of the population of the whole Red River watershed in less than 10% of the basin area. Our study aimed at understanding and quantifying the processes by which the delta affects the nutrient fluxes coming from the upstream watershed before they reach the sea. A comprehensive budget of nitrogen (N), phosphorus (P), and silica (Si) fluxes associated with natural and anthropogenic processes in the terrestrial and hydrological system of the delta was established for five sub-basins of the delta for the period 2000-2006, based on official statistical data, available measurements, and our own sampling campaigns and enquiries. The results show that anthropogenic inputs of N and P brought into the delta area are higher than the amounts delivered by the river from the upstream watershed. However, the amounts of these two elements ultimately delivered to the coastal zone from the delta are lower than the amounts carried by the upstream river, showing extremely efficient retention of both the soils and the delta's drainage network. For Si (taking into account both dissolved and amorphous solid forms), the retention is much lower. High retention of N and P and low retention of Si in the delta area have up to now protected the coastal zone from severe eutrophication problems.Electronic supplementary material The online version of this article

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Automatic method for the determination of ortho-phosphate and total dissolved phosphorus in the marine environment

Cited by 92 publications

References 6 publications

The impact of agricultural land use on stream chemistry and inputs to an inland reservoir: case of the Sauce Grande River, Argentina

The impact of agricultural land use on stream chemistry and inputs to an inland reservoir: case of the Sauce Grande River, Argentina

Nutrient regimes in the marginal ice zone of the Greenland Sea in summer

N, P, Si budgets for the Red River Delta (northern Vietnam): how the delta affects river nutrient delivery to the sea

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