CWEA Lab Analyst Grade 1, questions and answers with rated solutions

CWEA Lab Analyst Grade 1, questions and answers with rated solutions Celcius (F-32)5/9 HPC media water bath 45`C, 3hr Precision a measure of how close a series of measurements are to one another Accuracy how close a measurement is to the true value Electrical Fire unplug & sodium bicarbonate analytical balance a device for determining mass that gives highly accurate measurements top loading balance used to determine mass; not as precise as an analytical balance triple beam balance instrument used to measure mass, less sensitive than top loading Coliform Gram-negative rod-shaped bacteria normally present in the intestine; includes E. coli and other species. temp and pH temp rises, pH drops. Must measure pH within 15 min of collecting sample Always add ___ to ___ acid to water spectrometer a device that spreads light into its different colors rounding off .5=keep # even .4 stays the same .6 round up sig fig rules 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 smallest number of decimals Alkalinity hold time 14 days COD hold time 28 days BOD hold time 48 hours pH hold time 15 min Turbidity hold time 48 hours BOD Temp Incubator 20+/- 1`C Normality equation (N1)(V1)=(N2)(V2) Sample labels should include unique sample number, sample type, name of collector, date and time of collection, place of collection, and sample preservative mg/L to lb/day feed rate (lb/day)= dosage (mg/L) x flow rate (mgd) x 8.34