CWEA Lab Analyst Grade 1

Celcius - Answer- (F-32)5/9 HPC media water bath - Answer- 45`C, 3hr Precision - Answer- a measure of how close a series of measurements are to one another Accuracy - Answer- how close a measurement is to the true value Electrical Fire - Answer- unplug & sodium bicarbonate analytical balance - Answer- a device for determining mass that gives highly accurate measurements top loading balance - Answer- used to determine mass; not as precise as an analytical balance triple beam balance - Answer- instrument used to measure mass, less sensitive than top loading Coliform - Answer- Gram-negative rod-shaped bacteria normally present in the intestine; includes E. coli and other species. temp and pH - Answer- temp rises, pH drops. Must measure pH within 15 min of collecting sample Always add ___ to ___ - Answer- acid to water spectrometer - Answer- a device that spreads light into its different colors rounding off - Answer- .5=keep # even .4 stays the same .6 round up sig fig rules - Answer- Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. adding sig figs - Answer- smallest number of decimals Alkalinity hold time - Answer- 14 days COD hold time - Answer- 28 days