On-line microdialysis–ion chromatographic determination of inorganic anions in olive-oil mill wastewater

Buldini, Pier Luigi; Mevoli, Anna; Quirini, Angelo

doi:10.1016/s0021-9673(00)00434-9

Cited by 31 publications

(10 citation statements)

References 10 publications

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“…Also, the dialysate can be sampled as fractions over time allowing studying kinetics of diffusive transport (Sulyok et al, 2005;Inselsbacher and Nä sholm, 2012). Therefore, it is surprising that until now use of MD for P has not been reported; the general suitability of MD technique for phosphate has been documented by Buldini et al (2000) who applied it for continuous P monitoring of waste waters.…”

Section: Introductionmentioning

confidence: 99%

Assessment of diffusive phosphate supply in soils by microdialysis

Demand

Schack‐Kirchner

Lang

2017

J. Plant Nutr. Soil Sci.

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Standard procedures to assess P availability in soils are based on batch experiments with various extractants. However, in most soils P nutrition is less limited by bulk stocks but by strong adsorption and transport limitation. The basic principle of root‐phosphate uptake is to strip phosphate locally from the solid phase by forming a radial depletion zone in the soil solution, optionally enhanced by release of mobilizing substances. Microdialysis (MD), a well‐established method in pharmacokinetics, is capable to mimic important characteristics of P root uptake. The sampling is by diffusional exchange through a semipermeable membrane covering the probes with their sub‐mm tubular structure. Additionally, the direct environment of the probe can be chemically modified by adding, e.g., carboxylates to the perfusate. This study is the first approach to test the applicability of MD in assessing plant available phosphate in soils and to develop a framework for its appropriate use.We used MD in stirred solutions to quantify the effect of pumping rate, concomitant ions, and pH value on phosphate recovery. Furthermore, we measured phosphate yield of top‐soil material from a beech forest, a non‐fertilized grassland, and from a fertilized corn field. Three perfusates have been used based on a 1 mM KNO3 solution: pure (1), with 0.1 mM citric acid (2), and with 1 mM citric acid (3). Additionally, a radial diffusion model has been parametrized for the stirred solutions and the beech forest soil.Results from the tests in stirred solutions were in good agreement with reported observations obtained for other ionic species. This shows the principal suitability of the experimental setup for phosphate tests. We observed a significant dependency of phosphate uptake into the MD probes on dialysate pumping rate and on ionic strength of the outside solution. In the soils, we observed uptake rates of the probes between 1.5 × 10−15 and 6.7 × 10−14 mol s−1 cm−1 in case of no citrate addition. Surprisingly, median uptake rates were mostly independent of the bulk soil stocks, but the P‐fertilized soil revealed a strong tailing towards higher values. This indicates the occurrence of hot P spots in soils. Citrate addition increased P yields only in the higher concentration but not in the forest soil. The order of magnitude of MD uptake rates from the soil samples matched root‐length related uptake rates from other studies. The micro‐radial citrate release in MD reflects the processes controlling phosphate mobilization in the rhizosphere better than measurements based on “flooding” of soil samples with citric acid in batch experiments. Important challenges in MD with phosphate are small volumes of dialysate with extremely low concentrations and a high variability of results due to soil heterogeneity and between‐probe variability. We conclude that MD is a promising tool to complement existing P‐analytical procedures, especially when spatial aspects or the release of mobilizing substances are in focus.

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Section: Introductionmentioning

confidence: 99%

Assessment of diffusive phosphate supply in soils by microdialysis

Demand

Schack‐Kirchner

Lang

2017

J. Plant Nutr. Soil Sci.

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“…In a representive study, cytochrome c, insulin, lysozyme, and ribonuclease A were separated from human serum albumin by using dialysis procedure [18]. In another study, the determination of inorganic anions in olive oil mill wastewater can be achieved by using dialysis procedure [19]. However, no previous research had focused on the analysis of anions and orotic acid in milk samples by using dialysis technique for sample preparation.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Different Anions in Milk Samples Using Ion Chromatography with Conductivity Detection

Destanoğlu

Yılmaz

2016

Journal of the Turkish Chemical Society, Section A: Chemistry

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Abstract:In this study, a simple method for simultaneous determination of chloride, nitrate, sulfate, iodide, phosphate, thiocyanate, perchlorate, and orotic acid in milk samples was investigated. The method involves the use of dialysis cassettes for matrix elimination, followed by ion chromatographic analysis of the anions on a high capacity anion exchange column with suppressed conductivity detection. The novelty of the proposed method was the use of dialysis process which did not need any chemical and organic solvent for elimination of macromolecules such as fat, carbohydrates and proteins from milk samples. External standard calibration curves for these analytes were linear with good correlation coefficients. The relative standard deviations of analyte concentrations were acceptable both inter-day and intra-day evaluations. Under optimized conditions, the limit of detection (Signal-to-Noise ratio = 3) for chloride, phosphate, thiocyanate, perchlorate, iodide, nitrate, sulfate, and orotate was found to be 0. 012, 0.112, 0.140, 0.280, 0.312, 0.516, 0.520, and 0.840 mg L −1 , respectively. Significant results were obtained for various spiked milk samples with % recovery in the range of 93.88 -109.75 %. The proposed method was successfully applied to milk samples collected from Istanbul markets. The advantages of the method described herein are reagent-free, simple, and reliable.

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“…Spectrophotometric methods for the determination of nitrate have been developed over the past several decades [7][8][9][10][11]. Common methods for nitrate analysis utilize ionexchange chromatography combined with spectrophotometric, conductimetric, or electrochemical detection and are suitable for a wide variety of environmental samples, such as drinking water, ground water, acid rain waters, and wastewater [12][13][14][15][16][17]. However, although they have high sensitivity and good reproducibility, these techniques require large and expensive instruments and extensive pre-treatment of the sample.…”

Section: Introductionmentioning

confidence: 99%

A conducting polymer/Ag nanoparticle composite as a nitrate sensor

Atmeh

Alcock-Earley

2011

J Appl Electrochem

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A novel electrochemical sensor was fabricated by electrodeposition of silver nanoparticles on pre-synthesized polypyrrole (PPy), to form a PPy/Ag composite matrix on a glassy carbon electrode. The electrochemical sensor exhibited strong catalytic activity with regards to nitrate reduction. Scanning electron microscopy and cyclic voltammetry were used for the characterization of the composite. The detection limit of nitrate was found to be 5 lM. Moreover, the sensor showed excellent sensitivity, selectivity, and stability.

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On-line microdialysis–ion chromatographic determination of inorganic anions in olive-oil mill wastewater

Cited by 31 publications

References 10 publications

Assessment of diffusive phosphate supply in soils by microdialysis

Assessment of diffusive phosphate supply in soils by microdialysis

Simultaneous Determination of Different Anions in Milk Samples Using Ion Chromatography with Conductivity Detection

A conducting polymer/Ag nanoparticle composite as a nitrate sensor

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