| Term | Definition |
|---|
| plasticware advantages | high resistence, flexibility, inexpensive |
| lab supply accuracy | national institute of standards and technology must be class a. |
| (tc) to contain | do not deliver the same volume when liquid is transferd. |
| (td) to deliver | will deliver the amount requested |
| volumectirc flask | has a round flat lower portion with a long skiny neck, calibrated to hold one exact amount and has an etched calibration line |
| erlenmyer flask | desinged to hold different volumes, only good for rough measurments. |
| griffin beaker | very poor accuracy and used for holding reagents |
| graduated cylinder | calibration marks along th side, doesent have to accuracy of volumetric glassware |
| tc pipetes | uasually graduated, holds or contains a a specific volume but does not dispence the exact volume |
| td pipets | desinged to deliver a known amount, will dispense the volume indicacted with only the aid of gravity |
| blow out pipet | has a continuous ethed ring or 2 small close continuous rings located near the top of the pipet |
| self draining pipet | no marking, tip must never come in contact with the accumaulating fluid in the recieving vessel |
| graduated pipets | capable of dispensing several different types of fluids |
| transfer pipets | designed to dispense one volume without further subdivisions |
| ostwalt-folin pipet | bulb near the lower end, can contain set volume, frosted band at the mouth, used fro fluids with a higher viscosity than water |
| volumetric pipet | bulb near the middle, used for water like solutions, and should be used when diluting standards, calibrations or qc matter |
| pasteur pipet | it is used to transfer fluids with out consideration of a specific volume, should not be used in analytical techniques |
| automatic pipet | may be made for any volume and is equipped with a plunger that controls the delivery of fluid |
| micro pipet | total holding volume less than 1ml. calibrated to contain one set volume |
| spectum for violet | 380-440 |
| spectrum for blue | 440-500 |
| spectrum for green | 500-580 |
| spectrum for yellow | 580-600 |
| spectrum for orange | 600-620 |
| spectrum for red | 620-750 |
| eqaution for the concenteration of the unknown | cu=(au)(cs)/as |
| transmittence | the amount of light that passes through a sample and makes it to the detector |
| absorbance | a measure of the amount of radiant power absorbed by the sample |
| visual colorimetery | interperated by the human eye |
| photoelectrical photoimetery | interperated by machine |
| spectrophotometer | used to measure light transmitted by a solution in order to determine the concentration of the light absorbing substance in the solution |
| monochromaters | a device for selecting a range of wavelengths, surrounding the specified wavelength |
| colored glass filters | pass a relativly wide band of radiant energy and have a low transmittance of the selected wavelength |
| interference filters | composed of transparent glass or quartz substrate on which multiple layers of dielectric material, sometimes seperated by spacer layers |
| prism | seperates light based on refraction |
| diffraction grating | consists of many parralell groves etched onto a polished surface |
| cuvete | a place to hold the sample that is being tested |
| atomic absorbtion spectrophotometer | measures comcentration of a sample by detecting absorbance of emr by atoms |
| turbidmetery | measures light scattering as a decrease in the light transmitted through the solution |
| nephelometer | mesasures solute concentration by amount of light scattered in forwared direction |
| fluourometer | measures the immediate emmision of light from a molecule or atom following absorbtion of radiation (fluoresence) |
| osometery | ueses either freezing point depression of vapor pressure depression to measure the concentration of solute particules in the solution |
| potentiometer | measurement of the electrical potential between two electrodes in an electrochemical cell |
| ph electrode | measures the hydrogen ion activity of a solution |
| direct ise | more common and done on undiluted samples |
| indirect ise | requires pre diluted samples |
| coulometer | measures the amount of current passing between 2 electrodes in an electrochemical cell, the time required to titrate a sample is measured also. |
| electrophoresis | migration of charged solutes or particles in an electrical field |
| electrophoresis supporting fields | cellulose acetate, agarose gel, polyacrylamide gel, starch gel |
| scintillation counter | particle or radiation detector which operates through emission of light flashes that are deteched by a photosensitive device. |
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