Development of a flow injection system with two analytical paths for ammonium determination in soil extracts by conductometry

Reis, Boaventura F.; Vieira, Joana; Krug, Francisco José; Giné, María Fernanda

doi:10.1590/s0103-50531997000500015

Cited by 43 publications

(33 citation statements)

References 7 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, an automatic rain sensors based on a conductometric sensor was proposed by Gutz and co-workers, 205 and Krug and co-workers. 206 Tubino and Barros 207 have also described a conductometric sensor coupled to a flow injection system to measure soil extracts and acidity in vinegars. Recently, the development of electrochemical sensors based on measurement of electrochemical admittance spectroscopy were also investigated by Stradiotto and co-workers.…”

Section: Conductometric Sensorsmentioning

confidence: 99%

Electrochemical sensors: a powerful tool in analytical chemistry

Stradiotto¹,

Yamanaka²,

Zanoni³

2003

J. Braz. Chem. Soc.

317

148

View full text Add to dashboard Cite

Sensores potenciométricos, amperométricos e condutométricos são sensores eletroquímicos com imensa aplicação nas áreas de meio ambiente, indústria e análises clínicas. O presente trabalho apresenta uma revisão generalizada dos aspectos fundamentais, os desenvolvimento e a contribuição destes sensores na área de química analítica, e reporta alguns aspectos relevantes dos avanços na área de sensores eletroquímicos no Brasil.Potentiometric, amperometric and conductometric electrochemical sensors have found a number of interesting applications in the areas of environmental, industrial, and clinical analyses. This review presents a general overview of the three main types of electrochemical sensors, describing fundamental aspects, developments and their contribution to the area of analytical chemistry, relating relevant aspects of the development of electrochemical sensors in Brazil.

show abstract

Section: Conductometric Sensorsmentioning

confidence: 99%

Electrochemical sensors: a powerful tool in analytical chemistry

Stradiotto¹,

Yamanaka²,

Zanoni³

2003

J. Braz. Chem. Soc.

317

148

View full text Add to dashboard Cite

show abstract

“…Total metals were determined with a series 6000 inductively coupled plasma optical emission spectrometer (ICP OES) from Thermo Scientific (Waltham, USA). Total hardness was determined by ethylenediaminetetraacetic acid (EDTA) titration, 25 and ammonia (NH 3 -N) obtained by calculation, taking into account the ammonium ion quantification (NH 4 -N) determined by flow injection conductometry, 26 as well as pH and temperature of the water samples. 23 The NH 3 contents were estimated based on the reversible reactions between NH 4 and NH 3 assessed by the pH values and aquarium temperatures during water sample collections.…”

Section: Methodsmentioning

confidence: 99%

Tilapia (Oreochromis niloticus) as a Biondicator of Copper and Cadmium Toxicity. A Bioavailability Approach

Silva¹,

Motta²,

Tintor³

et al. 2016

Journal of the Brazilian Chemical Society

View full text Add to dashboard Cite

The acute toxicity of copper and cadmium in Oreochromis niloticus was evaluated through a 96 h static assay. Precipitation of Cu and co-precipitation of Cd in the presence of Cu were noted, being indicative of differences in nominal and actual concentrations of metals. Under these conditions, LC 50-96h was determined as 3.53 mg L -1 Cu, 20.1 mg L -1 Cd and 1.36 mg L -1 (Cu + Cd). Besides the quantitative determinations of total dissolved metals in water, considerations on Cd/Cu interactions in aquatic media were presented, allowing the assessment for metals speciation. Data revealed that alkalinity, hardness, dissolved organic carbon and formation of inorganic complexes reduce metal availabilities, mainly in relation to Cu. In spite of this, the LC 50 for Cd was significantly reduced in the presence of Cu, matching environmental realistic values. Based on simulated fate of metals, hardness may impair a reduction of 18 and 2% in metal activities, respectively to Cu and Cd.

show abstract

“…Measurements of the standard ammonia concentration in the air were taken in a fallow area, i.e., without plants. The amount of NH 4 + was measured by flux injection analyses (FIA), as described by Reis et al (1997).…”

Section: Experiments 2 Growing Conditions and Experimental Designmentioning

confidence: 99%

Emissions of ammonia following glyphosate application on Urochloa decumbens

Damin¹,

Trivelin²,

Bonassi³

et al. 2016

PLANT SOIL ENVIRON

View full text Add to dashboard Cite

Glyphosate [(N-(phosphonomethyl)glycine] is a post emergence herbicide used to weed control, cover crop desiccation in conservationist systems and pre-harvesting desiccation. The widespread use of this herbicide has been related to some environmental concerns. In the last years, some studies have shown that glyphosate could affect nitrogen (N) transformations in the soil-plant systems, enhancing nitrogen losses and changing N mineralization rates (Haney et al. 2002, Damin et al. 2008, 2010a, Castoldi et al. 2012. Damin et al. (2008) demonstrated that signal grass (Urochloa decumbens) desiccation with glyphosate enhances N losses from plant-soil system, with more than 16% of the N from fertilizer being lost 15 days after herbicide application. The higher N losses observed after glyphosate application may be related to ammonia (NH 3 ) emission by plants. The main factors driving NH 3 emission are the NH 4 + content in leaves, stomata conductance, plant's age and species and NH 3 levels in the atmosphere (Loubet et al. 2002, Mattsson andSchjoerring 2002). Herbicides affect more than one of these factors, so their application may affect NH 3 emission by plants.NH 3 emission by agricultural areas account for 10% up to 20% of global NH 3 emission (Behera et al. 2013). It is an important process of N output in agriculture lands, reducing N use efficiency; moreover, it is an environmental concern as well (Galloway et al. 2003).In Brazilian agroecosystems, signal grass is one of the most widespread weeds (Neto et al. 2008). Moreover, it is used as a cover crop in no-till systems, in the area between rows of plant species such as coffee (Coffea spp.) and orange (Citrus spp.) and for farming-cattle integration systems; all these systems use glyphosate to control weeds and/or kill cover crops. Within this context, the objective of this study was to evaluate NH 4 + and total nitrogen (N tot ) levels in plant's tissues and NH 3 emission by foliage after glyphosate application on signal grass. Emissions of ammonia following glyphosate application on Urochloa decumbens ABSTRACTThis work was carried out with the objective of evaluating the ammonium (NH 4 + ) levels and emissions of ammonia (NH 3 ) after glyphosate application on signal grass (Urochloa decumbens). Two experiments were carried out and the following treatments were used: (1) Control -mechanic harvest with no herbicide application on signal grass; (2) Glyphosate -signal grass desiccation with the herbicide glyphosate. Ammonium (NH 4 + ); total nitrogen (N tot ) levels in plant's tissues (experiment 1) and ammonia (NH 3 ) emission by the plants or the soil (experiment 2) were evaluated over time, under field conditions. Signal grass desiccation with the herbicide glyphosate enhanced NH 4 + levels from 2-24% of the N tot at 12 days after herbicide application. The cumulative NH 3 emission by leaves were increased from 2.8-5.3 kg/ha 30 days after herbicide application. Glyphosate application increases NH 3 losses by plant, but it does not affect the NH 3 emissions by ...

show abstract

Development of a flow injection system with two analytical paths for ammonium determination in soil extracts by conductometry

Cited by 43 publications

References 7 publications

Electrochemical sensors: a powerful tool in analytical chemistry

Electrochemical sensors: a powerful tool in analytical chemistry

Tilapia (Oreochromis niloticus) as a Biondicator of Copper and Cadmium Toxicity. A Bioavailability Approach

Emissions of ammonia following glyphosate application on Urochloa decumbens

Contact Info

Product

Resources

About