Nitrate‐nitrogen determination—a critical review

Sah, R. N.

doi:10.1080/00103629409369230

Cited by 103 publications

(44 citation statements)

References 86 publications

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“…− 3 -N contents were determined via indophenol blue colorimetry (Sah, 1994) and ultraviolet spectrophotometry (Norman et al, 1985), respectively. Dissolved organic N (DON) was calculated by subtracting dissolved inorganic N (NH For the determination of the soil dissolved organic carbon (DOC), 10 g of fresh soil subsamples were shaken with 0.5 M K 2 SO 4 at a 1 : 5 w/v ratio for 1 h at 24 • C, and the suspension was filtered at 0.45 µm under suction.…”

Section: -N and Nomentioning

confidence: 99%

Seasonal and interannual dynamics of soil microbial biomass and available nitrogen in an alpine meadow in the eastern part of Qinghai–Tibet Plateau, China

Wang

et al. 2018

Biogeosciences

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Abstract. Soil microbial activity varies seasonally in frozen alpine soils during cold seasons and plays a crucial role in available N pool accumulation in soil. The intra-and interannual patterns of microbial and nutrient dynamics reflect the influences of changing weather factors, and thus provide important insights into the biogeochemical cycles and ecological functions of ecosystems. We documented the seasonal and interannual dynamics of soil microbial and available N in an alpine meadow in the eastern part of Qinghai-Tibet Plateau, China, between April 2011 and October 2013. Soil was collected in the middle of each month and analyzed for water content, microbial biomass C (MBC) and N (MBN), dissolved organic C and N, and inorganic N. Soil microbial community composition was measured by the dilutionplate method. Fungi and actinomycetes dominated the microbial community during the nongrowing seasons, and the proportion of bacteria increased considerably during the early growing seasons. Trends of consistently increasing MBC and available N pools were observed during the nongrowing seasons. MBC sharply declined during soil thaw and was accompanied by a peak in available N pool. Induced by changes in soil temperatures, significant shifts in the structures and functions of microbial communities were observed during the winter-spring transition and largely contributed to microbial reduction. The divergent seasonal dynamics of different N forms showed a complementary nutrient supply pattern during the growing season. Similarities between the interannual dynamics of microbial biomass and available N pools were observed, and soil temperature and water conditions were the primary environmental factors driving interannual fluctuations. Owing to the changes in climate, seasonal soil microbial activities and nutrient supply patterns are expected to change further, and these changes may have crucial implications for the productivity and biodiversity of alpine ecosystems.

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Section: -N and Nomentioning

confidence: 99%

Seasonal and interannual dynamics of soil microbial biomass and available nitrogen in an alpine meadow in the eastern part of Qinghai–Tibet Plateau, China

Wang

et al. 2018

Biogeosciences

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“…The resulting electrode voltage output is mathematically converted to concentration via the calibration curve, and subsequently to content (mg kg -1 ) via the soil:extractant ratio. Many researchers over the years have studied various aspects of NO 3¯-ISE performance (accuracy, repeatability, stability, reliability), the potential for measurement interference by other ions, solution ionic strength, and use of deionized or distilled water as an extractant, for a multitude of use conditions, and in comparison with other chemical-based laboratory methods of soil nitrate determination (Myers & Paul, 1968;Mahendrappa, 1969;Milham et al, 1970;Onken & Sunderman, 1970;Dahnke, 1971;Mack & Sanderson, 1971;Yu, 1985;Sah, 1994). As a result, NO 3¯-ISEs have enjoyed wide acceptability because the results obtained are comparable to other chemical-based methods' results, and they are quick and simple to use.…”

Section: Spectrophotometer Sensor Based Systemsmentioning

confidence: 99%

In-Field Measurement of Soil Nitrate Using an Ion-Selective Electrode

Sibley¹,

Brewster²,

Astatkie³

et al. 2010

Advances in Measurement Systems

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“…The NH 4 + and/or NO 3 -and/or NO 2 -concentrations in soil and sediment extracts have been determined usually by UVVis spectrophotometry (Ahmed et al, 1996;Castro and Korn, 2004;Haby, 1989;Hatton et al, 1992;Laima, 1994;Moorcroft et al, 2001;Pandurangappa and Venkataramanappa, 2008;Pasquali et al, 2010;Sah, 1994;Selmer-Olsen et al, 1971;Sreekumar et al, 2003;Vendrell and Zupancic, 1990;Yang et al, 1998). Other detection techniques such as potentiometry (Bremner et al, 1968;Hatton and Pickering, 1990;Sah, 1994;Tabatabai, 1974) and ion chromatography (IC) (Sah, 1994;Stewart, 1987) have been used only for nitrate and nitrite determination.…”

Section: Introductionmentioning

confidence: 99%

“…Other detection techniques such as potentiometry (Bremner et al, 1968;Hatton and Pickering, 1990;Sah, 1994;Tabatabai, 1974) and ion chromatography (IC) (Sah, 1994;Stewart, 1987) have been used only for nitrate and nitrite determination.…”

Section: Introductionmentioning

confidence: 99%

Fast and simultaneous ultrasound-assisted extraction of exchangeable-NH₄⁺, NO₃⁻and NO₂⁻species from soils followed by ion chromatography determination

Pontes

Carneiro

Vaitsman

et al. 2012

Chemical Speciation & Bioavailability

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A method for the determination of exchangeable-ammonium, nitrate and nitrite species in soils by using a fast and simultaneous ultrasound-assisted extraction procedure followed by ion chromatography with conductimetric detection is proposed. Variables such as extraction method (ultrasonic bath or orbital shaker) and extractant type (water or acetic acid solution) were studied. The ultrasound-assisted reaction time was optimized. The best extraction efficiency was found when 0.5 g of soil sample was ultrasonically treated with 30 mL of acetic acid solution at pH 4.0 for 20 min. The results for acid soils or moderately basic (pH £ 8.1) were in agreement with those obtained by a classical method. The proposed method is preferable to the classical method because it is less laborious, faster, requires lower amount of sample and reagents and no carcinogenic reagent is used. The detection limits were 1.3 mg g -1 for NH 4 + -N, 0.06 mg g -1 for NO 3 --N, and 0.08 mg g -1 for NO 2 --N. The relative standard deviations were lower than 7% (n = 3) for all nitrogen species.

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Nitrate‐nitrogen determination—a critical review

Cited by 103 publications

References 86 publications

Seasonal and interannual dynamics of soil microbial biomass and available nitrogen in an alpine meadow in the eastern part of Qinghai–Tibet Plateau, China

Seasonal and interannual dynamics of soil microbial biomass and available nitrogen in an alpine meadow in the eastern part of Qinghai–Tibet Plateau, China

In-Field Measurement of Soil Nitrate Using an Ion-Selective Electrode

Fast and simultaneous ultrasound-assisted extraction of exchangeable-NH₄⁺, NO₃⁻and NO₂⁻species from soils followed by ion chromatography determination

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Nitrate‐nitrogen determination—a critical review

Cited by 103 publications

References 86 publications

Seasonal and interannual dynamics of soil microbial biomass and available nitrogen in an alpine meadow in the eastern part of Qinghai–Tibet Plateau, China

Seasonal and interannual dynamics of soil microbial biomass and available nitrogen in an alpine meadow in the eastern part of Qinghai–Tibet Plateau, China

In-Field Measurement of Soil Nitrate Using an Ion-Selective Electrode

Fast and simultaneous ultrasound-assisted extraction of exchangeable-NH4+, NO3−and NO2−species from soils followed by ion chromatography determination

Contact Info

Product

Resources

About

Fast and simultaneous ultrasound-assisted extraction of exchangeable-NH₄⁺, NO₃⁻and NO₂⁻species from soils followed by ion chromatography determination