Field Conductivity Meter
Field Conductivity Meter - Related Videos
09:28
Using a pH Meter
0 Views •
2023
Source: Laboratory of Dr. Zhongqi He - United States Department of Agriculture Acids and bases are substances capable of donating protons (H+) and hydroxide ions (OH-), respectively. They are two extremes that describe chemicals. Mixing acids and bases can cancel out or neutralize their extreme effects. A substance that is neither acidic nor basic is neutral. The values of proton concentration ([H+]) for most solutions are inconveniently small and difficult to compare so that a more practical...
01:16
Electric Field of Parallel Conducting Plates
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2023
Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution. Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric field, the...
17:31
Operant Learning of Drosophila at the Torque Meter
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Cited by 25 •
2008
Measuring the yaw torque of tethered Drosophila with the torque meter allows the neuroscientist exquisite control of the stimulus situation of the experimental animal. Together with the unique genetic tools available in the fruit fly, this paradigm is used for a wide variety of neurobiological research.
08:09
Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity
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2018
Here we present a methodology which matches a soil sample size and a hydraulic conductivity measurement device to prevent the so-called wall flow along the inside of the soil container from being erroneously included in water flow measurements. Its use is demonstrated with samples collected from a wastewater irrigation site.
12:11
Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method (EFM)
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Cited by 105 •
2012
We describe a relatively rapid (30 min) and realistic method for simultaneously measurement of leaf hydraulic conductance (Kleaf) and stomatal conductance (gs) for transpiring excised leaves. The method can be modified to measure the light and dehydration responses of Kleaf and gs.
FAQs
The instrument applies a small electrical signal between electrodes immersed in the sample and measures the resulting conductance. It then converts that response into conductivity, allowing the reading to reflect the sample’s ability to carry current. This mechanism provides a rapid estimate of dissolved ionic content without requiring immediate laboratory processing.
Conductivity serves as an overall indicator of dissolved ionic content rather than identifying particular ions individually. In water, soil extracts, or culture media, changes in the reading can therefore signal differences in the sample’s ionic conditions. Researchers can use those differences to compare habitat conditions, monitor changes, or assess factors relevant to biological systems.
Conductivity changes with temperature, so two otherwise comparable samples may produce different readings if measured at different temperatures. Temperature compensation adjusts the measurement to account for this influence, improving interpretation across field observations. This feature is especially relevant when monitoring environmental sites or comparing samples collected under changing conditions.
A typical measurement places the meter’s electrodes in the water, soil extract, culture medium, or other sample, applies the instrument’s small electrical signal, and records the converted conductivity value. Temperature compensation is used when available because temperature affects conductivity. Taking the reading directly at the sampling site helps reduce changes that could occur during transport.
Researchers can use the instrument to characterize freshwater and marine habitats, assess salinity and water quality, and monitor changes in ecosystem conditions. Its portability supports measurements at multiple sampling sites, where rapid readings can reveal spatial or temporal differences. These observations provide environmental context for interpreting biological patterns in aquatic systems.
Measurements from soil extracts or culture media help researchers monitor ionic conditions that may influence biological activity. In soil studies, readings can contribute to assessments of nutrient availability and changing environmental conditions. In culture systems, repeated measurements can track shifts in the medium, supporting interpretation of experimental conditions without relying only on observations of the organisms.