Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Eulerian and Lagrangian Flow Descriptions01:22

Eulerian and Lagrangian Flow Descriptions

1.8K
Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
The Eulerian method focuses on fixed points in space where fluid properties, such as velocity, pressure, and temperature, are observed as the fluid moves between these...
1.8K
Application of Linearization and Approximation01:29

Application of Linearization and Approximation

193
A drone flying through complex terrain often relies on more than one sensing method to estimate small changes in altitude. Along with direct measurements, air pressure provides a useful indirect indicator of vertical movement. Atmospheric pressure decreases as altitude increases, and this relationship is commonly described using an exponential model. Although accurate, converting pressure measurements into altitude values requires calculations that are too complex to perform repeatedly during...
193
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

876
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant...
876
Plane Potential Flows01:23

Plane Potential Flows

1.2K
Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform...
1.2K
Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

5.1K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
5.1K
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

961
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
961

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Microwave-assisted sample preparation: A review of 50 years of achievements and trends.

Analytica chimica acta·2026
Same author

One-pot iron determination in fortified flours using thymol-1,10-phenanthroline deep eutectic solvent and smartphone-based digital image photometry.

Analytical methods : advancing methods and applications·2026
Same author

Revisiting Catalytic Methods Exploiting Digital Videos: Sequential Determination of Copper and Sucrose in Sugarcane Spirits.

ACS omega·2025
Same author

Determination of volatile acids in sugarcane spirits exploring an air drag system and digital image photometry.

Analytical methods : advancing methods and applications·2025
Same author

An improved approach for analysis of chocolate by laser induced breakdown spectroscopy (LIBS) using L-menthol as matrix modifier.

Talanta·2025
Same author

Natural deep eutectic solvent as extractor and support for determination of metals by laser induced breakdown spectroscopy.

Analytica chimica acta·2025
Same journal

Smartphone-assisted fluorescence and colorimetric dual-mode sensor for visual quantitative detection of nitrite and nitrate in real samples.

Analytica chimica acta·2026
Same journal

Folding integrated all-paper photoelectrochemical immunoassay using annealed ZnO for point-of-care detection of ferritin.

Analytica chimica acta·2026
Same journal

Dual-mode electrochemical-SERS detection of chloramphenicol based on dual-signal enhancement.

Analytica chimica acta·2026
Same journal

Multi-screening of beta-lactam antibiotics in milk based on Fe<sub>3</sub>O<sub>4</sub>@phage/bacteria system and aggregation induced emission luminogen.

Analytica chimica acta·2026
Same journal

A porous phosphate-rich β-cyclodextrin polymer for efficient and broad-spectrum enrichment of antibiotics.

Analytica chimica acta·2026
Same journal

Corrigendum to "LUMIN: A novel algorithm for automated mixture quantification using 1D <sup>1</sup>H NMR spectra" [Analytica Chimica Acta 1411 (2026) 345639].

Analytica chimica acta·2026
See all related articles

Related Experiment Video

Updated: May 1, 2026

Curtain Flow Column: Optimization of Efficiency and Sensitivity
06:44

Curtain Flow Column: Optimization of Efficiency and Sensitivity

Published on: June 12, 2016

6.3K

An improved approach for flow-based cloud point extraction.

Rejane M Frizzarin1, Fábio R P Rocha1

  • 1Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, P.O. Box 96, 13400-970, Piracicaba - SP, Brazil.

Analytica Chimica Acta
|April 22, 2014
PubMed
Summary
This summary is machine-generated.

Novel flow-based cloud point extraction (CPE) methods enhance sensitivity by retaining the surfactant-rich phase directly in the spectrophotometer. This environmentally friendly approach offers fast, solvent-free separation and pre-concentration for iron determination.

Keywords:
Cloud point extractionFlow analysisIronMulti-pumping flow systemPre-concentrationSpectrophotometry

More Related Videos

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
10:53

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

6.7K
Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
09:17

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

Published on: April 23, 2018

10.2K

Related Experiment Videos

Last Updated: May 1, 2026

Curtain Flow Column: Optimization of Efficiency and Sensitivity
06:44

Curtain Flow Column: Optimization of Efficiency and Sensitivity

Published on: June 12, 2016

6.3K
Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
10:53

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

6.7K
Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
09:17

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

Published on: April 23, 2018

10.2K

Area of Science:

  • Analytical Chemistry
  • Environmental Chemistry

Background:

  • Flow-based cloud point extraction (CPE) faces challenges including surfactant-rich phase dilution and the need for organic solvents.
  • Existing methods often require external heating and complex elution steps, limiting efficiency and environmental friendliness.

Purpose of the Study:

  • To develop novel strategies for flow-based CPE to overcome existing limitations.
  • To enhance sensitivity and reduce solvent consumption in analytical procedures.
  • To create a faster and more environmentally friendly on-line separation and pre-concentration technique.

Main Methods:

  • Direct retention of the surfactant-rich phase (SRP) in the spectrophotometric cell to avoid dilution.
  • Utilizing solenoid micro-pumps for improved mixing and controlled flow-rate modulation.
  • Inducing cloud point via on-line neutralization reaction heat and salt concentration increase, eliminating external heating.
  • Spectrophotometric determination of iron as a model analyte.

Main Results:

  • Achieved higher sensitivity by directly retaining the SRP.
  • Demonstrated a linear response for iron determination from 10 to 200 μg L⁻¹ with a coefficient of variation of 2.3%.
  • Obtained a detection limit of 5 μg L⁻¹ and a sampling rate of 26 samples per hour.
  • Reported an enrichment factor of 8.9 with minimal reagent consumption (6 μg TAN, 390 μg Triton X-114).
  • Validated results against reference procedures for various sample matrices, including freshwater and food digests.

Conclusions:

  • The proposed innovations circumvent major drawbacks of traditional flow-based CPE.
  • The method is a fast, sensitive, and environmentally friendly alternative for on-line separation and pre-concentration.
  • Successfully applied to iron determination in diverse real-world samples, showing excellent agreement with certified values.