Onsite measurement is necessary to preserve sample integrity and ensure data accuracy for the following field measurements: water temperature, dissolved-oxygen (DO) concentration, specific electrical conductance (SC), pH, and reduction-oxidation potential (redox/ORP).
A variety of single-parameter and multiparameter field-measurement instruments are available that use various technologies to measure the same water property and that require differing calibration, maintenance, and measurement methods.
|YSI Multiparameter Datalogging Sondes
Multiparameter instruments that contain sensors (each specific to the measurement of a given physical, chemical, or biological property) that are bundled in a single housing (a sonde) and deployed in environmental waters.
Advantages of Multiparameter Sondes:
|Portable Turbidity Meters
Turbidity, which can make water appear cloudy or muddy, is caused by the presence of suspended and dissolved matter, such as clay, silt, finely divided organic matter, plankton and other microscopic organisms, organic acids, and dyes. The color of water, whether resulting from dissolved compounds or suspended particles, can affect a turbidity measurement.
The following are examples of the uses for turbidity data:
Data Buoy Systems
Geotech data buoy systems are unique data collection platforms designed for Met and surface water quality monitoring. Geotech buoys feature a modular design that adapts to a variety of application and sensor installations. Many of the platforms are solar powered – with panels positioned to maximize solar exposure and reflection.
Water Quality Parameters
pH, ORP, Conductivity, Dissolved Oxygen, Turbidity, Ion Selective Electrodes (ISE), Temperature, Water Level, and more.
Air Temperature, Humidity, Barometric Pressure, Wind Speed & Direction
Data from the Buoy can be transmitted real-time and/or stored internally.
|Seametrics Water Quality Sensors
Often the changes in water measurements are more important than the actual measured values. Depending on the manufacturer, some instruments can store instantaneous or continuous measurements to internal or external memory in a format compatible with a hand-held display, personal digital assistant (PDA), or laptop computer.
|Colorimeters, Photometers and Test Strips
Colorimeters and Photometers are used to analyze samples of water, suspended sediment, and bottom material for their content of inorganic and organic constituents.
Test strips are an economical way to perform spot checks for water quality. They change color when exposed to the factor of interest.
In general, a colorimetric procedure involves adding some type of chemical (or “reagent”) to a sample of water. The reagent then reacts with the substance we are trying to measure, causing a color change in the sample.
The following are applications of Colorimetric analysis:
|Calibration Buffers, Standards, Reagents and Cleaners
Reference materials whose properties have been established so that it can provide a level of performance verification. For field measurements, examples are pH buffers, specific conductivity standards, chemical reagents, turbidity standards and oxidation reduction potential standards.
Field instrumentation require supplies for the actual collection process as well as quality control activities and crucial operational maintenance.
The robust In-Situ Buoy stands as a dependable and economical monitoring platform tailored for extended deployments of instrumentation and telemetry in diverse aquatic settings. This includes: ponds, lakes, bays, rivers, and coastal near-shore environments.
Geotech Environmental Equipment, Inc.
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Denver, CO 80205
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