CWEA LABORATORY ANALYST CERTIFICATION 2024/2025

ALL GRADES EXAM 2024 | ACCURATE REAL EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK FLASHCARDS | GUARANTEED PASS CWEA LABORATORY ANALYST CERTIFICATION 2024/2025 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 ALL GRADES EXAM 2024 | ACCURATE REAL EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK FLASHCARDS | GUARANTEED PASS 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. ALL GRADES EXAM 2024 | ACCURATE REAL EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK FLASHCARDS | GUARANTEED PASS 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 of 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 ANSWER 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 6,684 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? - CORRECT 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 ANSWER 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 ALL GRADES EXAM 2024 | ACCURATE REAL EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK FLASHCARDS | GUARANTEED PASS ANSWER ignitability, corrosivity, reactivity, and toxicity.