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A Stiff diagram, or Stiff pattern, is a graphical representation of chemical analyses, first developed by H.A. Stiff in 1951.It is widely used by hydrogeologists and geochemists to display the major ion composition of a water sample.
MLU for Windows LT – Free software for pumping test and slug test analysis in one or two aquifer systems; VINMOD Multi-Well – Groundwater pollution analysis using pumping tests and pollution parameters from pumped groundwater; Hytool - Open source toolbox for pumping and build up tests interpretation on Matlab
A free water clearance of zero means the kidney is producing urine isosmotic with respect to the plasma. Values greater than zero imply that the kidney is producing dilute urine through the excretion of solute-free water. Values less than zero imply that the kidney is conserving water (likely under the influence of antidiuretic hormone, ADH ...
An EPA scientist samples water in Florida Everglades. Samples of water from the natural environment are routinely taken and analyzed as part of a pre-determined monitoring program by regulatory authorities to ensure that waters remain unpolluted, or if polluted, that the levels of pollution are not increasing or are falling in line with an agreed remediation plan.
In the test, an excess of manganese(II) salt, iodide (I −) and hydroxide (OH −) ions are added to a water sample causing a white precipitate of Mn(OH) 2 to form. This precipitate is then oxidized by the oxygen that is present in the water sample into a brown manganese -containing precipitate with manganese in a more highly oxidized state ...
Piper diagram of water samples from the Mtshabezi River, Zimbabwe. Data source: [2] A Piper diagram is a graphical representation of the chemistry of a water sample or samples. The cations and anions are shown by separate ternary plots. The apexes of the cation plot are calcium, magnesium and sodium plus potassium cations.
Depending on the properties of the aquifer and the size of the slug, the water level may return to pre-test levels very quickly (thus complicating accurate collection of water level data). A slug can be added by either quickly adding a measured amount of water to the well or something which displaces a measured volume (e.g., a long heavy pipe ...
Selection or a particular sampler type depends on the type of analysis to be performed (e.g. ambient water quality or wastewater), the type of water source (e.g. a lake or pond, small stream or large river, coastal waters or deep ocean) and other factors such as ambient environmental conditions (e.g. collection of stormwater during a rain event ...