Comparator-A device used to compare the color of a sample against a standard during colorimetric testing..
Dropping Pipet-Eyedropper-like pipet with a measurement mark used to measure and transfer liquids.
End Points-That instance at which an anticipated chemical change or reaction takes place because of a change in
conditions or because of the addition of chemical solutions.
Fix-To treat a chemical solution so that its concentration does not change.
Graduated Cylinder-Chemical apparatus with measurement markings used to accurately measure liquids.
Indicator-A chemical solution added to water which changes color to indicate a change in the condition of the water, e.g.
during a titration procedure.
Interferences-When testing for a particular element, another element or compound present in the sample will cause an
error in the result.
Meniscus-A curvature in a liquid top level in a measuring tube caused by an affinity to the tube material by the liquid.
Oxidation-The combination of a substance with oxygen.
Photocell-Device that converts light intensity to an electrical signal.
Pipet-Laboratory apparatus with which fluids are measured or transferred.
Pipet-Filler Rubber bulb used to safely fill pipets by suction.
pH-the logarithm of the reciprocal of the hydrogen ion activity expressed in moles per liter.
Powder Pillows-Chemicals in dry powder form, usually pre-measured and packaged individually for one test.
Precipitate-A solid which forms when a substance held in solution passes out of solution into a solid form.
Shelf Life-The expected duration of time, under specified conditions, in which a chemical substance will react with a
SPADNS Reagent-A reagent used with the spectrophotometer test for fluorides.
Standard Solutions-A standard solution is a known concentration of an element in water. Standard solutions may be
furnished as part of a kit or made up prior to the test.
Titration-Titration is the process of determining the constituent in a known volume of solution by the measured addition of
a reacting chemical solution of known concentration to completion of the reaction as signaled by observation of a end
Titrimetric-Test A test using the process of titration to determine the concentration of a substance in solution.
Turbidity-The cloudy or opaque appearance of water due to particles in suspension.
Untreated Water Sample-The term "Untreated Water" or "Original Water Sample" appearing in some procedures
indicates that the raw water is to be used without the addition of chemicals.
Volumetric Measurement-The determination of the concentration of an unknown solution by the addition of measured
volumes of a chemical solution of known concentration.
Water Sample-A measured amount of raw water which is to be analyzed.