Georgia Drinking Water Laboratory Analyst Practice Test

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• What do the initials TC stand for in laboratory measurements?
• What must be added to a fluoride sample when performing the ion-selective electrode test?
• What is the secondary purpose of treating drinking water?
• Which of the following is a common consequence of fluorodosis?
• Which instrument is commonly used for the titration of chlorine in water samples?
• What effect do caustic soda, soda ash, and lime have on pH levels?
• What must be measured in conjunction with conductivity?
• In which procedure may the reagent EDTA be utilized?
• What is the primary purpose of treating drinking water?
• In which stage of water treatment is coagulation primarily utilized?
• What is the action level for lead in drinking water?
• Total dissolved solids can be estimated by which other test?
• What factors typically contribute to the hardness of drinking water?
• What is the hold time for fluoride?
• What is the optimal pH range to determine free chlorine using the amperometric titration method?
• What kind of thermometer is inserted in a water bath to the point where the "immersion line" meets the level of the water?
• The process of feeding enough chlorine to meet demand and form a free chlorine residual is called what?
• What does the term 'primacy' refer to in the context of drinking water regulations?
• Which component is formed during the reaction of chlorine with organic matter?
• Which unit of measurement is commonly used on a spectrometer scale?
• In which document can you find the federal Safe Drinking Water Regulations?
• What condition must be met for the accurate measurement of total chlorine?
• What is the role of a titrator in water analysis?
• Which piece of glassware is most appropriate for preparing laboratory solutions?
• How long should chemical analysis records, such as THM/HAA results, be maintained?
• Which technique is approved for monitoring fluoride levels in water?
• What is the purpose of enhanced coagulation in water treatment?
• What type of chemicals require an MSDS sheet?
• How often does the State of Georgia require that fluoride be checked?
• What is the appropriate hold time for chlorine samples before analysis?
• What is the MCL for lead as determined by water quality standards?
• At what temperature are TDS analyses run?
• What is the hold time for all metals testing (except Mercury)?
• Which of the following is NOT a function of the Safe Drinking Water Act?
• Which compound is commonly used to assess the hardness of water?
• How do we know that a pipet is a "blow out" pipet?
• Where should one refer to for federally approved sample holding times and preservation techniques?
• If the initial reading on a buret is 15.4ml and the final reading after titration is 27.2ml, how many ml of titrant was removed from the buret?
• What tests are first draw samples primarily used for?
• Which of the following statements about the presumptive phase of the MPN test is accurate?
• Membrane filter Petri dishes should be incubated in which position?
• In the amperometric titration method for chlorine, what is the titrant that is used?
• What is the incubator temperature for the membrane filtration procedure for total coliform?
• Why is sodium thiosulfate added to total coliform bottles?
• What is the potential consequence of excessive fluoride exposure in drinking water?
• What is a composite sample?
• What is phenolphthalein?
• What is the hold time for alkalinity testing?
• For an oil-based fire, which type of extinguisher is appropriate?
• What is the primary use of AMCO-AEPA-1 in water testing?
• What type of container must be used to collect fluoride samples?
• Which sampling method is primarily used for monitoring lead and copper levels?
• Why is record retention important in water testing?
• What does the HPC (heterotrophic plate count) test measure?
• What state agency requires fluoride in many drinking waters?
• How often should a pH meter ideally be calibrated?
• What is the titrant used in the alkalinity test?
• An N/50 sulfuric acid solution is also known as what strength?
• What criteria indicate that samples have been dried to a stable weight?
• In the membrane filtration procedure using m-Endo agar, what color are the coliform colonies?
• Which class of fire extinguisher is recommended for an electrical fire?
• In the presence of fluoride, what effect does SPADNS have?
• In the MPN procedure, what is the media used to confirm the presence of total coliform?
• What is the appropriate state of pH for drinking water?
• What is the minimum chlorine concentration allowed in the drinking water distribution system?
• Which type of pipet only measures one volume?
• Which parameter must be closely monitored when performing chlorine testing methods?
• What procedure must be performed on dirty fluoride samples prior to analysis?
• Before the analysis of chlorine can proceed, what is the necessary step to prepare the glassware?
• What color does Colilert change to in the presence of total coliform?
• Alkalinity consists predominantly of which three components?
• What process involves using chemicals to agglomerate colloidal suspended materials?
• What additional sample is included when resampling a site that was positive for total coliform?
• How long should records for Lead and Copper sampling be retained?
• What role does chlorine serve as a strong oxidizer in water treatment?
• To which test does the Wheatstone bridge method refer?
• How many grams of KCl are needed to create 1.5 liters of a 3M solution?
• At what temperature should the drying oven be set when analyzing for total suspended solids?
• What alcohol concentration is used to sterilize forceps in the membrane filter test for total coliform?
• What is the name of the titrating device used to measure chlorine in water samples?
• What must be done if the sample pH differs by more than 2 degrees Celsius from the buffers?
• What is the primary function of a buffer in a solution?
• What are the three common fluoride chemicals used in water treatment?
• Fluoride levels in drinking water are monitored primarily for what reason?
• What reagent is commonly added to bottles for total coliform samples?
• What does the presence of total coliform bacteria in a sample suggest?
• What chemical compound is used to standardize chlorine tests?
• Volumetric glassware is typically calibrated at what temperature?
• If chlorine is fed at 3mg/L and the residual after 30 minutes is 0.5 mg/L, what is the chlorine demand?
• What document provides daily updates to the Code of Federal Regulations (CFR)?
• What does the term 'pathogenic' refer to in the context of water quality?
• What does sample preservation involve?
• Which of the following is NOT a characteristic of a composite sample?
• What are the principal causes of hardness in water?
• For how long should lead and copper records be maintained?
• What is the maximum contaminant level (MCL) for residual chlorine in drinking water?
• Which action would NOT constitute good laboratory practice for chemical waste disposal?
• Which federal organization is responsible for administering the Safe Drinking Water Act?
• What are the two approved methods for the detection of fluoride in samples?
• What forms when chlorine combines with ammonia in water?
• When chlorine reacts with organic compounds, which two groups of compounds are produced?
• What is the hold time for samples analyzed for specific conductance?
• How many years are microbiological records required to be kept by law?
• What is one of the principal functions of the Safe Drinking Water Act?
• What test is related to conductivity?
• How many mg/L of solids is equivalent to 1% solids?
• In which test is KMnO4 typically used as a standard?
• If phenolphthalein alkalinity is equal to total alkalinity, what is the source of all alkalinity?
• Which procedure requires the addition of TISAB to a fluoride sample?
• When calibrating a thermometer, how far can it differ from the reference thermometer before it must be discarded?
• What is the hold time for a TDS sample?
• When using a volumetric pipet calibrated for TD, what happens to the liquid remaining in the tip after draining?
• What characteristic feature identifies a graduated pipet?
• What color does DPD turn in the presence of chlorine?
• Which of the following is a primary benefit of maintaining a buffer system in water?
• What is the most common material used in the laboratory?
• How are autotrophic organisms characterized?
• How often does the EPA require that fluoride be officially checked?
• What indicative property does the change of color in Colilert signify?
• Which of the following is a method for maintaining optimal fluoride levels in water systems?
• Total chlorine residual is comprised of which two parts?
• What characteristic defines an amphoteric substance?
• What material forms an "upside down", "reverse", or "convex" meniscus?
• Which method is NOT approved for the detection of fluoride in samples?
• Are volumetric flasks more commonly calibrated at To Deliver (TD) or To Contain (TC)?
• For what primary purpose is fluoride added to drinking water?
• What broth is used during the presumptive stage of the MPN test for total coliform?
• At what temperature is water densest?
• What is the acceptable threshold for bicarbonate alkalinity if total alkalinity measures 10 mg/L?
• What does it indicate when the Colilert sample fluoresces?
• At a pH less than 8.3, phenolphthalein appears as what color?
• If your phenolphthalein alkalinity is 2.5 mg/l and total alkalinity is 10 mg/l, what is your bicarbonate alkalinity?
• How can fluoride levels be accurately determined in a sample?
• How is hardness expressed in water analysis?
• Which process involves the inactivation of pathogenic organisms in water using chemical oxidants?
• What is the primary goal of fluoride addition in drinking water?
• In the analysis of fluoride levels, what property does the Ion Selective Electrode utilize?
• In what units is turbidity expressed?
• Which type of thermometer provides the fastest temperature readings?
• How long must microbiological records be retained according to regulations?
• Total dissolved solids (TDS) are referred to as what by the EPA?
• What effect will too much fluoride have on teeth?
• What is the significance of the immersion line on a thermometer?
• If you have 500mls of 10N NaOH, how much 2.5N Sulfuric Acid is needed for neutralization?
• Which of the following should never be used to extinguish an electrical fire?
• Which chemical is used as a standard for measuring conductivity?
• Why is temperature important in sample preservation?
• Which term defines the Maximum Contaminant Level in drinking water?
• What is the purpose of flocculation in water treatment?
• Chloramines are a product of which type of reaction in water treatment?
• Which process is aimed at decreasing the concentration of contaminants in water through physical and chemical means?
• What is the most common sample preservation temperature for water samples?
• How do primacy states enforce regulations under the Safe Drinking Water Act?
• What do the initials TD stand for in laboratory measurements?
• What is the action level set for copper in drinking water?
• What is the standard reference material for measuring conductivity?
• What is the secondary limit for fluoride?
• What is the MCL for fluoride?
• What is a common use for an Erlenmeyer flask in laboratory settings?
• What is the primary purpose of a fume hood in a laboratory?
• What must be added to samples prior to using an ion selective electrode to measure fluoride?
• What distinguishes quantitative results from qualitative results?
• Where are the State of Georgia's Safe Drinking Water regulations located?
• What is the primary concern of sampling error in laboratory results?
• Which of the following describes the three phases of testing in the MPN test?
• What is a potential consequence of high turbidity levels during chlorine disinfection?
• At what pH level is phenolphthalein alkalinity determined?
• What law relates light absorbance to the amount of reagent in the sample?
• What range of fluoride does the state recommend that a system maintain?
• What is one of the primary uses of chlorine in water treatment?
• In the hardness test, what is the titrant used?
• Which substance is commonly used to decrease pH in water treatment?
• What is the required sample volume when testing finished drinking water for total coliform?
• What is the hold time for a turbidity sample?
• What is the primary goal of disinfection in water treatment?
• In the DPD titrimetric method for chlorine, what titrant is typically used?
• What process is commonly used to remove particulate matter from water?
• What condition is described as having alkalinity equal to total alkalinity?
• What is the significance of breakpoint chlorination in water treatment?
• During which process are flocks formed to enhance removal efficiency?
• What is the focus of the Safe Drinking Water Act?
• Anions are attracted to which electrode in an electrically charged solution?
• Heterotrophic Plate Count tests are typically incubated for how long?
• What preservative is commonly added to sample containers for total coliform samples?
• What types of parameters are included in the EPA 500 Series of test methods?
• What class of fire is associated with oil or grease?
• What must the pH be for a sample if free chlorine is to be effectively tested?
• Formazin is the standard used for measuring what parameter?
• What units is conductivity expressed in?
• How long should microbiological sample records be maintained?
• What term describes the chemical capacity of water to neutralize acids?
• How long should glassware for chlorine analysis ideally be soaked for cleaning?
• Fluoride is regulated under which of the following?
• What is the hold time for BACT samples from the distribution system?
• Conductivity should be measured at what temperature for accuracy?
• What process involves the removal of solids before water filtration?
• When measuring for phenolphthalein alkalinity, the sample is titrated to an end-point pH of what?
• Very small finely divided solids that remain dispersed in a liquid due to size and electrical charge are known as?
• What is the purpose of a desiccator in the laboratory?
• What does the confirmation phase of the MPN test involve?
• What is the main cause of most erroneous lab results in water testing?
• What is the first step in ensuring compliance with fluoridation regulation?
• What is the purpose of using a volumetric flask in the laboratory?
• Which method is utilized for measuring total coliform in water?
• How often should a reference thermometer be recalibrated or replaced?
• How long should chemical analysis records be maintained?
• How much SPADNS reagent is required for a 25ml sample?
• What can be concluded if an indicator organism is detected in a water sample?
• What method is commonly used to analyze chlorine concentrations in water samples?
• How often is conductivity analysis required on pure lab water?
• What is the highest level of contaminant in drinking water that poses no known health risk?
• Which compound is used as a color indicator in the DPD method for chlorine?
• What piece of glassware should be used for preparing 100ml of a standard?
• What is a key difference between a first draw sample and a grab sample?
• What is a chain of custody record?
• In what units are coliform densities reported for the membrane filtration procedure?
• What does the term 'hold time' refer to in water sample analysis?
• What is the hold time for conductivity measurements?
• What type of pipets are graduated from a zero mark near the top to the tip?
• What does 0.00 absorbance equal in terms of % Transmittance?
• When measuring total chlorine, which chemical must be added to the sample during analysis?
• What is considered the best way to store a pH probe?
• What is the hold time for turbidity samples?
• What is the primary substance used in the titration for hardness testing?
• For how long should corrective action and public notice records be maintained?
• How does turbidity affect disinfection by chlorine?
• What is the term used to describe the measurement of hydrogen ion activity in a solution?
• If the pH of a solution changes from 6 to 4, how does its acidity change?
• To properly neutralize 10N NaOH, how much 2.5N Sulfuric Acid will you need?
• What is the material that passes through a glass fiber filter and remains after evaporation at 180 Celsius?
• In the event of a positive total coliform result at a distribution site, where should resampling occur?
• In the total alkalinity test, the sample is titrated to an end-point pH of what?
• What is an indicator organism?
• When mixing water and acid, which is the correct procedure?
• At a pH greater than 8.3, phenolphthalein is what color?
• A solution with a pH below 6.5 is classified as?
• What is the official hold time for hardness samples?
• What is one reason for adding chlorine to water?
• When is it recommended to analyze pH samples after collection?
• The electrons found in the outer shell of atoms are referred to as what?
• What is the term for the consistency of measurement when a sample is tested repeatedly under controlled conditions?
• Which type of bacteria can have their precision evaluated without considering accuracy?
• What is the role of the EPA concerning drinking water contaminants?
• What is the difference between disinfection and sterilization?
• What type of filter is used in the Total Suspended Solids (TSS) procedure?
• What is the target concentration for fluoride in the drinking water system?