Quantifying uranium complexation by groundwater dissolved organic carbon using asymmetrical flow field-flow fractionation

2007 ◽  
Vol 91 (3-4) ◽  
pp. 233-246 ◽  
Author(s):  
James F. Ranville ◽  
M. Jim Hendry ◽  
Thorsten N. Reszat ◽  
Qianli Xie ◽  
Bruce D. Honeyman
Keyword(s):  
Organic Carbon ◽  
Flow Field ◽  
Dissolved Organic Carbon ◽  
Field Flow Fractionation ◽  
Flow Fractionation

scholarly journals Characterisation of colloids using asymmetrical flow field-flow fractionation and online organic carbon detection

2017 ◽  
Vol 17 (5) ◽  
pp. 1219-1224
Author(s):  
T. Meyn ◽  
C. Hallé
Keyword(s):  
Organic Carbon ◽  
Flow Field ◽  
Environmental Samples ◽  
Uv Light ◽  
Field Flow Fractionation ◽  
Recirculating Aquaculture ◽  
Organic Carbon Concentration ◽  
Carbon Detection ◽  
Flow Fractionation ◽  
Pre Treatment

Asymmetrical flow field-flow fractionation (AF4) has been used to characterise the size and organic carbon concentration of colloids in environmental samples, without extensive pre-treatment. The addition of a true online organic carbon detector (OCD) to the combination of UV, fluorescence and multi-angle light scattering detectors provides a unique tool for a better understanding of the composition of dissolved and particulate organic matter (OM) present in environmental samples. Polystyrene sulfonate sodium salt polymers were used as standards. Colloidal material was characterised in surface water, road runoff from a residential area and the effluent from a recirculating aquaculture system. All samples contained organic or inorganic colloids associated with organic carbon to various degrees and with various sizes. The OCD clearly added another layer of information, allowing for detection of organic colloids independent of their ability to scatter light or absorb UV-light. The recovery of carbon varied between 10% and 100% depending on the nature of the sample.

scholarly journals Limitations of Nanoparticles Size Characterization by Asymmetric Flow Field‑Fractionation Coupled with Online Dynamic Light Scattering

2021 ◽  
Author(s):  
Francesco Giorgi ◽  
Judith M. Curran ◽  
Douglas Gilliland ◽  
Rita La Spina ◽  
Maurice Whelan ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Flow Field ◽  
Field Flow Fractionation ◽  
Asymmetric Flow ◽  
Uv Detector ◽  
Elution Time ◽  
On Line ◽  
Real Size ◽  
Flow Fractionation

AbstractThe development of reliable protocols suitable for the characterisation of the physical properties of nanoparticles in suspension is becoming crucial to assess the potential biological as well as toxicological impact of nanoparticles. Amongst sizing techniques, asymmetric flow field flow fractionation (AF4) coupled to online size detectors represents one of the most robust and flexible options to quantify the particle size distribution in suspension. However, size measurement uncertainties have been reported for on-line dynamic light scattering (DLS) detectors when coupled to AF4 systems. In this work we investigated the influence of the initial concentration of nanoparticles in suspension on the sizing capability of the asymmetric flow field-flow fractionation technique coupled with an on-line dynamic light scattering detector and a UV–Visible spectrophotometer (UV) detector. Experiments were performed with suspensions of gold nanoparticles with a nominal diameter of 40 nm and 60 nm at a range of particle concentrations. The results obtained demonstrate that at low concentration of nanoparticles, the AF4-DLS combined technique fails to evaluate the real size of nanoparticles in suspension, detecting an apparent and progressive size increase as a function of the elution time and of the concentration of nanoparticles in suspension.

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