CWEA LABORATORY ANALYST CERTIFICATION EXAM ALL GRADES 2024 | ACCURATE REAL EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK FLASHCARDS | GUARANTEED PASS

CWEA LABORATORY ANALYST CERTIFICATION EXAM ALL GRADES 2024 | 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 ove r 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 Halo genated 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 pht halate (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 follow ing 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 plast ic 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 a pproximate toxicity of a solution is called a: - CORRECT ANSWER range finding test. A toxicity test designed to establish concentration at which a particular end point occurs is called a: - CORRECT ANSWER definitive test. Which of the following types o f control samples may be used to determine accuracy? - CORRECT ANSWER Certified reference material Which of the following types of control samples may be used to determine precision? - CORRECT ANSWER Duplicate The average flow in a treatment plant is 3 .1 MGD. A chlorine residual of 4.0 mg/L is maintained and the effluent must be dechlorinated before discharging. If an excess of 0.5 mg/L of sulfur dioxide is required after dechlorination, how many lbs/day of sulfur dioxide must be added? - CORRECT ANSWE R 106 lbs SO2/day A plant serving a city of 50,000 population has an influent settleable solids of 10 mL/L. If per capita contribution to the plant flow is 100 gallons/day, how much sludge is produced in the plant in cubic feet/day? - CORRECT ANSWER 6,68 4 cu ft/day Which of the following formulas determines chlorine demand? - CORRECT ANSWER Chlorine dose - chlorine residual = chlorine demand What is the most important measurable parameter to judge the performance of an anaerobic sludge digester? - COR RECT ANSWER Volatile solids reduction What is a multicopy shipping document that accompanies hazardous waste shipments called? - CORRECT ANSWER Manifest The HAZWOPER Standard, 29 CFR 1910.120 addresses which of the following situations? - CORRECT ANSWE R Requires documentation of training for the handling of major spills and acutely hazardous materials A waste is considered hazardous if it has at least one of the following properties: - CORRECT ANSWER ignitability, corrosivity, reactivity, and toxicity . 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 aver age 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. Coll ect 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.