mouth piece
The end of the pipette to which suction is applied to draw up liquid into the pipette is called
delivery tip
The end through which liquid flows is called
stem
the portion of pipette between mouth piece and diivery tip
bore
the inside diameter of the pipette
volumetric pipette
This pipette has only one calibration line on stem, which measures only a single volume
graduated pipette
many calibrations lines on stem, which measure various volumes
milliliters
the volume which the pipettes has been designed to measure is stated in
To delivery
This glassware is calibrated with distlled or deionized water.
To Contain
This glassware is calirated with mercury.
To delivery
after the volume of liquid has been expelled from from this pipette, the liquid which "wet " the walls are allowed to remain in the pipette.
To contain
indicates that the pipette is allowed to drain freely and then rinsed out with the diluent so the entire volume contained by the pipette is transferred.
20
Temperature of Calibration is ________ degrees
It should be blown out
Frost bands on the mouthpiece indicate WHAT that when delivering a liquid
no frost bands
Pipettes which has ____ ___________ are not blown out but alllowed to drain with the last drop staying in the tip.
10
never use a pipette that is more than ______ times th volume to be measured.
blow out
Frost bands means
do not blow out (let drain to tip)
no frost bands means
Mohr pipette
No frost bands, graduated with the last calibration line dening above the delivery tip
Serological pipette
frost bands, graduated all the way through the delivery tip.
Volumetric
cylindrical shaped bulb and stem is marked with a single calibration line, designed to measure a single volme, No frosted bands, marked to TD
Ostwald-Folin
round bulb and the stem is marked with a single calibration line, measure a single volume,frost bands, marked TD,
20ml
A pipette is basically a hollow glass tube used for measuring small volumes of liquids usually less than
hold this amount when filled
To Conatins means
deliver this amont when emptied into another container
To Deliver
Light source
polychromatic using a tungsten bulb
absorbance
measure of the amount of light "stopped" by a solution
standard
a solution that contains a known amount of analyte
accuracy
ability to obtain the true value for a sample
precision
ability to repeat results over multiple analysis
mean
average
control
patient like substances used to monitor precision and accuracy
calibration
process of adjusting the instrument or test to provide a known relationship between reponse and concentration
sensitivity
detection of smallest analyte concentration
standard
a substance whose concentration of specific analytes are known
proficiency testing
test performed for outside comparison
standard deviation
variability of specimen results relative relative to mean
range
difference between highest and lowest value in a data set
normal reference interval
healthy population value range for an analyte
Variance
the measure of the average squared distance of data points from mean
confidence intervals
the limits between which we except a specified proportion of a population to lie
Trend
a gradual change in the mean that prroceeds in one direction
shift
an abrupt change in the mean the become continuous
Random Error
the error that occurs without any real pattern (due to chance)
Systematic Error
the error that is continuous and effects all results equally (consistent in one direction)