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CWEA GRADE 1 LAB ANALYST EXAM STUDY GUIDE 2026 COMPLETE QUESTIONS AND ANSWERS

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CWEA GRADE 1 LAB ANALYST EXAM STUDY GUIDE 2026 COMPLETE QUESTIONS AND ANSWERS An amperometric titration is often used when measuring – Correct Answer Residual chlorine The most important reason for chlorinating effluent is - Correct Answer Disinfection Chlorination serves primarily to destroy or deactivate disease-producing microorganisms When wastewater samples are chlorinated and the pH is lowered - Correct Answer HCLO is formed Hypochlorous acid Which of the following constituents is the best disinfecting agent? - Correct Answer HClO What is most likely to interfere with the DPD test? - Correct Answer Oxidized manganese How is N, N-diethyl-p-phenylenediamine more commonly represented? - Correct Answer DPD The chlorine residual may be determined using the reagent - Correct Answer DPD The quantity of chlorine that is converted to inert or less active forms of chlorine by substances in wastewater - Correct Answer Total combined chlorine Before you perform an amperometric titration for total residual chlornie, what two solutions should be added to the sample? - Correct Answer Kl and acetate buffer (Potassium iodide) When performing an amperometric titration for chlorine, how many milliliters of sample should be analyzed? - Correct Answer 200 mL When using a spectrophotometer to measure chlorine, what wave length of light should be used? - Correct Answer 515 nm An effluent with a high level of ammonia nitrogen has chlorine residual that is mostly - Correct Answer Combined chlorine The mercuric nitrate titration technique for measuring chloride is falling into disuse in the laboratory because the: - Correct Answer technique is lengthy and requires highly skilled instrument technicians to accurately analyze the samples. Standard phenylarsine oxide solution (PAO): - Correct Answer should be handled with caution because it is a severe poison.

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Uploaded on: January 27, 2026
Number of pages: 43
Written in: 2025/2026
Type: Exam (elaborations)
Contains: Questions & answers

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