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CWEA LABORATORY ANALYST CERTIFICATION EXAM
ALL GRADES 202 5 | ACCURATE REAL EXAM VERSIONS |
CURRENTLY TESTING WITH A STUDY GUIDE AND
KNOWLEDGE CHECK FLASHCARDS | GUARANTEED PASS
What does COLOR measure? - CORRECT ANSWER Amount of color units (CU) in a sample. Color caused by natural metallic ions (Fe & Mg) & industrial wastes. What is the test summary for COLOR? - CORRECT ANSWER Sample - > Tubes - > Compare to color standards over light source Which of the following techniques is used to isolate anionic surfactants (as MBAS) from the sample matrix? - CORRECT ANSWER Extraction In the cyanide determination, which one of the following is not an interference? - CORRECT ANSWER Halogenated aromatics Which of the following is not a major interference in phenol determination? - CORRECT ANSWER Hydroxy derivatives of benzene A freshly prepared sodium hydroxide (NaOH) solution is standardized against primary standard potassium acid phthalate (KHC8H4O4). 0.8000 grams of potassium acid phthalate was dissolved into 50 mL CO2-free water. 2 - 3 drops of phenolphthalein were added. The sample was titrated to a faint pink endpoint with 22 mLs sodium hydroxide. What is the normality of the sodium hydroxide? - CORRECT ANSWER 0.178 N What does an ICP source consist of? - CORRECT ANSWER A flowing stream of argon gas ionized by an applied radio frequency In gas chromatography, electron capture detectors (ECD) are used to detect which of the following compounds? - CORRECT ANSWER Chlorinated hydrocarbon pesticides
Why is methlyene chloride replaced by hexane in sample preparation for analyses detected by GC electron capture detection (ECD)? - CORRECT ANSWER Chlorine compounds are detected by ECD Which of the following methods is used to determine pesticides? - CORRECT ANSWER EPA Method 608 What analysis uses the purge and trap technique? - CORRECT ANSWER Volatile organic compound analysis The test for inhibitory residues on glassware and plastic ware determines the toxic or stimulatory effects of dishwashing detergents used for bacterial analysis. Which bacterial genera is used for this test? - CORRECT ANSWER Enterobacter The Water Suitability Test (Test for Bacteriological Quality of Reagent Water) determines the toxic or stimulatory effects of the distilled or deionized water system. Which bacteria genera is used for this test? - CORRECT ANSWER Enterobacter Short-term toxicity tests are inappropriate for: - CORRECT ANSWER determining chronic toxicity. Basic requirements for toxicity tests do not include: - CORRECT ANSWER documented re-use of control test organisms. A test in which solutions and test organisms are placed in test chambers and kept there for the duration of the test is called a: - CORRECT ANSWER static test. A test in which solution is replaced continuously in test chambers through the test duration is called a: - CORRECT ANSWER flow through test. A preliminary test designed to establish approximate toxicity of a solution is called a: - CORRECT ANSWER range finding test.
Performance standards do not place emphasis on which of the following? - CORRECT ANSWER Personality characteristics Of the following inquiries during an interview, which one is appropriate? - CORRECT ANSWER "By whom were you referred for a position here?" You are asked to determine the cost per test of the COD analysis. Use the following information: The base salary of an analyst is $30,000; employer paid benefits add 35% to the base salary; administrative overhead adds another 45% to the base salary; there are 10 paid holidays, 15 days paid vacation leave, and 12 days paid sick leave per year; the hourly salary is determined by dividing the monthly salary by 174. Each COD test requires an average of 20 minutes of labor from sample preparation to cleanup. Costs for chemicals, glassware, and equipment use average $1.00 per test. Disposal costs average $2000/year for reagents from 1,000 tests. What is the total cost per test? - CORRECT ANSWER $11.62 /test The lower warning limit (LWL) on an LCS control chart indicates: - CORRECT ANSWER The recovery which is two standard deviations below the average recovery. When two of three successive determinations fall outside the warning limits: - CORRECT ANSWER Another determination should be made, and if it is within the warning limits no action is needed. Which of the below statements is NOT correct when collecting samples for the detection of mercury by EPA 245.1 or SM 3112B? - CORRECT ANSWER a. Collect in polyethylene bottle and preserve with nitric acid and measure within 2 weeks. b. Collect in glass bottle and preserve with nitric acid and measure within 28 days. c. Collect in fluoropolymer bottle and preserve with nitric acid and measure within 28 days. d. All of the above are true. Which of the below statements is correct when collecting samples for the detection of mercury by EPA 1631? - CORRECT ANSWER Collect in fluoropolymer bottle and preserve with HCl within 48 hours.
Alkalinity - Bottle, Preservation, Hold Time - CORRECT ANSWER 250mL plastic/glass, unpres, 14 days 1,4 Dioxane - Bottle, Preservation, Hold Time - CORRECT ANSWER 500ml amber, sulfite/bisulfate, 28 days Ammonia - Bottle, Preservation, Hold Time - CORRECT ANSWER 500ml plastic/glass, pH< H2SO4, 28 days BNAS - Bottle, Preservation, Hold Time - CORRECT ANSWER 1L amber glass, sod thiosulfate, 7 days BOD / cBOD - Bottle, Preservation, Hold Time - CORRECT ANSWER 1L plastic/glass, unpreserved, 48 hr Metals - Bottle, Preservation, Hold Time - CORRECT ANSWER 500ml plastic, HNO3 pH<2, 6 mo 300.1 (Bromate, Chlorate, Chlorite) - Bottle, Preservation, Hold Time - CORRECT ANSWER 500ml plastic/glass, EDA, 28 days 300.0 + 300.1 (All Others)- Bottle, Preservation, Hold Time - CORRECT ANSWER plastic/glass, unpres, 28 days Chlorine Demand - Bottle, Preservation, Hold Time - CORRECT ANSWER amber, unpres, 24 hr Chlorine, Total Residual - Bottle, Preservation, Hold Time - CORRECT ANSWER plastic/glass, unpres, 0.25hr
TKN - Bottle, Preservation, Hold Time - CORRECT ANSWER amber plastic/glass, pH< H2SO4, 28 days Odor - Bottle, Preservation, Hold Time - CORRECT ANSWER glass, unpres, 6 hrs OP Pest / PCBS - Bottle, Preservation, Hold Time - CORRECT ANSWER amber glass, sodium thiosulfate, 7 days Perchlorate - Bottle, Preservation, Hold Time - CORRECT ANSWER plastic/glass, unpres, 28 days pH - Bottle, Preservation, Hold Time - CORRECT ANSWER plastic/glass, unpres, 0.25 hr o-Phosphorus - Bottle, Preservation, Hold Time - CORRECT ANSWER glass voa, filter, 48 hrs total Phosphorus - Bottle, Preservation, Hold Time - CORRECT ANSWER glass voa, pH< H2SO4, 28 days Phthlates - Bottle, Preservation, Hold Time - CORRECT ANSWER amber glass, HCl pH<2, 7 days Settleable solids - Bottle, Preservation, Hold Time - CORRECT ANSWER plastic/glass, unpres, 48 hr TSS/TDS/TS - Bottle, Preservation, Hold Time - CORRECT ANSWER plastic/glass, unpres, 7 days EC - Bottle, Preservation, Hold Time - CORRECT ANSWER plastic/glass, unpres, 28 days
Sulfide - Bottle, Preservation, Hold Time - CORRECT ANSWER clear glass, zinc acetate pH> NaOH, 7 days THM - Bottle, Preservation, Hold Time - CORRECT ANSWER amber voa, sod thiosulfate, 14 days TOC - Bottle, Preservation, Hold Time - CORRECT ANSWER amber voa, pH>2 H3PO4, 28 days Turbidity - Bottle, Preservation, Hold Time - CORRECT ANSWER glass/plastic, unpres, 48 hrs UV254 - Bottle, Preservation, Hold Time - CORRECT ANSWER amber glass, unpres, 48 hrs 524 VOCS - Bottle, Preservation, Hold Time - CORRECT ANSWER amber voa, HCl pH> (abs acid if chlor), 14 days 624 VOCS - Bottle, Preservation, Hold Time - CORRECT ANSWER amber voa, unpres / sod thio (if chlor), 3 days Coliform - Bottle, Preservation, Hold Time - CORRECT ANSWER sterile plastic/glass, sod thiosulfate, 8 hr (fecal)/ 30 hr (total) HPC - Bottle, Preservation, Hold Time - CORRECT ANSWER sterile plastic/glass, sod thiosulfate, 8 hr / 24 hrs Enterrococci - Bottle, Preservation, Hold Time - CORRECT ANSWER sterile plastic/glass, sod thiosulfate, 8 hr HPC - Bottle, Preservation, Hold Time - CORRECT ANSWER sterile plastic/glass, sod thiosulfate, 8 hr/24 hr Celcius - CORRECT ANSWER (F-32)5/
sig fig rules - CORRECT 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 - CORRECT ANSWER smallest number of decimals Alkalinity hold time - CORRECT ANSWER 14 days COD hold time - CORRECT ANSWER 28 days BOD hold time - CORRECT ANSWER 48 hours pH hold time - CORRECT ANSWER 15 min Turbidity hold time - CORRECT ANSWER 48 hours BOD Temp Incubator - CORRECT ANSWER 20+/- 1`C Normality equation - CORRECT ANSWER (N1)(V1)=(N2)(V2) Sample labels should include - CORRECT ANSWER unique sample number, sample type, name of collector, date and time of collection, place of collection, and sample preservative mg/L to lb/day - CORRECT ANSWER feed rate (lb/day)= dosage (mg/L) x flow rate (mgd) x
40 CFR 121 - 124 - CORRECT ANSWER The federal storm water regulations for the permitting of municipalities and industries. Regulations define storm water terms, permitting, inspecting, and sampling measurements
40 CFR 136 - CORRECT ANSWER The regulations for sampling preservation and analyses of water, wastewater, and solid waste 40 CFR 403 - CORRECT ANSWER The federal regulations defining the elements of a pretreatment program, prohibited discharges, and the approval process for establishing a pretreatment program Acid - CORRECT ANSWER A compound which liberates hydrogen ions and has a pH below 7 Alkalinity - CORRECT ANSWER The measurement of a sample's capacity to neutralize acid Approval Authority - CORRECT ANSWER The agency determining whether a pretreatment program contains the necessary elements to meet the intent of the Act Atomic Weight - CORRECT ANSWER The sum of the number of protons and the number of neutrons in the nucleus of an atom; atomic weights of elements are found on the periodic table Base - CORRECT ANSWER A compound which liberates hydroxide ions and have a pH above 7 Biochemical Oxygen Demands (BOD) - CORRECT ANSWER The quality of oxygen utilized in the biochemical oxidation of organic matter under standard lab procedures for 5 days at 20 °C, usually expressed as a concentration (mg/L). BOD measurements are used to indicate the organic "strength" of wastewater Biological Treament - CORRECT ANSWER A waste treatment process by which bacteria and other microorganisms break down complex organic or inorganic (ie ammonia) materials into simple, nontoxic, more stable compounds Categorical Industrial User (CIU) - CORRECT ANSWER An industrial user (refer to IU) that is conducting processes subject to a categorical standard promulgated by the US EPA
Confined Space - CORRECT ANSWER A space, which has limited openings for entry/exit, has unfavorable natural ventilation which could contain or produce dangerous air contaminants (or create an atmosphere of oxygen deprivation), and which is not intended for continuous employee occupations. A permit may be required under OSHA to enter a confined space Control Authority - CORRECT ANSWER The agency responsible for implementing a pretreatment program Conventional Pollutants - CORRECT ANSWER Those pollutants, which are usually found in domestic, commercial or industrial wastes ( such as suspended solids or biochemical oxygen demand) that POTWs are designed to treat Density - CORRECT ANSWER The relationship between weight and volume (ie g/cm3 or lbs/gal) Detention Times - CORRECT ANSWER The resident time of wastewater undergoing treatment in a treatment unit such as a clarifier or tank. Min detention times are required for settling, chemical treatment, and biological treatment Doppler flow meter - CORRECT ANSWER a device that measures the velocity of a liquid by measuring the change in frequency between a wave source and the meter Electroplating - CORRECT ANSWER The process of applying a thin metal coating to the surface of a substrate by electrodeposition of dissolved metal in a plating solution Flow Equalization - CORRECT ANSWER Temporary storage of wastewater flow to provide a more uniform flow or waste characteristics for treatment or discharge Flume - CORRECT ANSWER A specially shaped open channel flow section with an area and/or slope that is different from that of the channel Grab sample - CORRECT ANSWER a sample, which is taken from a wastestream without the regard to the flow in the wastestream, and over a period of time not to exceed 15 minutes
Holding time - CORRECT ANSWER the maximum time allowed between when a sample is taken and when it must be analyzed in the laboratory, in accordance with standard preservation, storage and analytical procedures Dissolved Sulfide (H2S) - CORRECT ANSWER produced by the biological reduction of sulfate and organic matter under anaerobic (oxygen-free) conditions. Dissolved sulfide can combine with hydrogen to form hydrogen sulfide gas. H2S gas is potentially hazardous to sewer maintenance workers Industrial User (IU) - CORRECT ANSWER Any non-domestic source, which introduces pollutants into a POTW Industrial Wastewater - CORRECT ANSWER Any non-domestic wastewater (excluding stormwater) Magnetic Flowmeter - CORRECT ANSWER A flowmeter that creates a magnetic field across a pipe flowing full, in which the liquid acts as a conductor to measure the velocity and flow in the pipe Mass Based Limits - CORRECT ANSWER Discharge limits based on allowable dry weigh of pollutant, usually expressed in pounds per day Mass Emission Rate - CORRECT ANSWER The rate of discharge of the dry weight of the pollutant in wastewater or air, expressed in lb/day or kg/day Material Safety Data Sheets (MSDS) - CORRECT ANSWER Sheets providing info about manufactured chemicals, as required by the Hazard Communication Rule Molarity - CORRECT ANSWER Moles per liter, a measure of concentration Mole - CORRECT ANSWER An avogadro's number of something
Positive Displacement Pumps - CORRECT ANSWER Pumps that use pistons, diaphragm actions, etc. to convey liquid. The discharge rate of these pumps does not vary with inlet or outlet pressure Pretreatment standard - CORRECT ANSWER any regulation promulgated by the EPA in accordance with sec 307(b)(c) of the CWA, applying to a specific category of IU and providing limitations on the introduction of pollutants into POTWs. This term includes BMPs, the prohibited discharge standards under 40 CFR 403.5 and local limits [per 40 CFR 403.3 (j)] Precipitation - CORRECT ANSWER part of a treatment process that takes dissolved pollutants out of solution to form a precipitate that can be removed by filtration or settling Printed Circuit Board - CORRECT ANSWER A circuit for electronic apparatus made by depositing conductive material, usually copper, on an insulating surface Process- Inhibition - CORRECT ANSWER The concentration of a pollutant that will reduce the effectiveness or efficiency of a biological treatment process in the POTWs Publicly Owned Treatment Works (POTWs) - CORRECT ANSWER A treatment works which is owned by a state, municipality, city, town, special sewer district, or other publicly owned and financed entity, as opposed to a privately owned (industrial) treatment facility. Includes any devices and systems used in the storage, treatment, recycling, and reclamation of municipal sewage of industrial wastes of liquid nature. Also include sewers, pipes and other conveyances only if they convey wastewater to a POTW treatment plant. The term can also mean the municipality (public entity) which has jurisdiction over the indirect discharges to and the discharges from such a treatment works Settling - CORRECT ANSWER The treatment process by which setteable or floatable solids are removed from wastewater by gravity separation in a tank or other vessel sludge quality standard - CORRECT ANSWER allowable concentration or mass of a pollutant in POTW sludge, or biosolids, used for land application, found in 40 CFR 503
Specific Gravity - CORRECT ANSWER 1) The weight of a particle, substance, or chemical solution in relation to the weight of an equal volume of water. (water has a specific gravity of 1. at 4 °C (39 °F)
- The weight of a particular gas in relation to an equal volume of air at the same temperature and pressure. (Air has a specific gravity of 1.0 and Chlorine, as a gas, has a specific gravity of 2.5) Total Suspended Solids (TSS) - CORRECT ANSWER Residue (mg/L) that is removed from a wastewater sample by a standard laboratory filtration procedure Turbine Meter - CORRECT ANSWER A positive displacement meter with an internal turbine turned by the water flow. Flow is proportional to the turbine rotation speed V-notch Weir - CORRECT ANSWER A triangular sharp-crested weir for measurement of liquid discharge in open channels. Volatile Solvents - CORRECT ANSWER A solvent that is capable of being evaporated or changed to a vapor at relatively low temperatures Weir - CORRECT ANSWER A dam built across an open channel over which liquid flows, usually through some type of opening or notch Wet Well - CORRECT ANSWER A compartment or tank in which wastewater is collected. The suction pipe of a pump may be connected to the wet well or a submersible pump may be located in the wet well Worker Right-to-know laws - CORRECT ANSWER legislation that requires employers to inform employees of the possible health effects resulting from contact with hazardous substances. At locations where this legislation is in force, employers must provide employees with information regarding any hazardous substances that they might be exposed to under normal working conditions or reasonably foreseeable emergency conditions resulting from workplace conditions.
- Standards prepared with solution containing cholorplatinate and cobaltous chloride Standard units for color - CORRECT ANSWER One unit= color resulting from 1 mg of platinum/L 2 color reporting - CORRECT ANSWER True and Apparent True color - CORRECT ANSWER Color from dissolved substances, determine using sample treated to remove turbidity Apparent Color - CORRECT ANSWER Includes dissolved and suspended solids Conductivity - CORRECT ANSWER H2Os capability to pass electrical flow Conductivity of pure water - CORRECT ANSWER 0 Units of conductivity - CORRECT ANSWER micromhos/cm Temperature conductivity should be read at - CORRECT ANSWER 25 degrees Celcius How is conductivity affected - CORRECT ANSWER Mobility of ions, conductivity is dependent on viscosity Viscosity - CORRECT ANSWER A liquids ability to resist flow, higher the viscosity the lower the flow Relationship of temperature and viscosity - CORRECT ANSWER Inverse Acid - CORRECT ANSWER A compound which liberates hydrogen ions and has a pH below 7.
Alkalinity: - CORRECT ANSWER The measurement of a sample's capacity to neutralize acid. Alkalinity measures - CORRECT ANSWER The carbonate, bicarbonate, and hydroxide ion concentration found in water Primary reason for measuring alkalinity - CORRECT ANSWER Used in control of many water and wastewater unit processes How is alkalinity measured - CORRECT ANSWER Titration of a sample with a standard solution of either sulfuric acid or hydrochloric acid to predetermined pH endpoint The phenolphthalein alkalinity of a water sample is zero if: - CORRECT ANSWER The pH is greater than 8. Atomic Weight: - CORRECT ANSWER The sum of the number of protons and the number of neutrons in the nucleus of an atom. Atomic weights of elements are found on periodic tables. Base: - CORRECT ANSWER A compound which liberates hydroxide ions and has a pH above
Biochemical Oxygen Demand (BOD): - CORRECT ANSWER The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedures for five days at 20° Centigrade, usually expressed as a concentration (e.g., mg/L). BOD measurements are used to indicate the organic "strength" of wastewater. Chain-of-Custody: - CORRECT ANSWER A legal record (which may be a series of records) of each person who had possession of an environmental sample, from the person releasing the sample, to the person who collected the sample, to
