CWEA Lab Analyst III Certification Test Questions with Answers

What does COLOR measure? - 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? - 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? - Extraction In the cyanide determination, which one of the following is not an interference? - Halogenated aromatics Which of the following is not a major interference in phenol determination? - 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? - 0.178 N What does an ICP source consist of? - 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? - Chlorinated hydrocarbon pesticides Why is methlyene chloride replaced by hexane in sample preparation for analyses detected by GC electron capture detection (ECD)? - Chlorine compounds are detected by ECD Which of the following methods is used to determine pesticides? - EPA Method 608 What analysis uses the purge and trap technique? - 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? - 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? - Enterobacter Short-term toxicity tests are inappropriate for: - determining chronic toxicity. Basic requirements for toxicity tests do not include: - 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: - static test. A test in which solution is replaced continuously in test chambers through the test duration is called a: - flow through test. A preliminary test designed to establish approximate toxicity of a solution is called a: - range finding test. A toxicity test designed to establish concentration at which a particular end point occurs is called a: - definitive test. Which of the following types of control samples may be used to determine accuracy? - Certified reference material Which of the following types of control samples may be used to determine precision? - 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? - 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? - 6,684 cu ft/day Which of the following formulas determines chlorine demand? - Chlorine dose - chlorine residual = chlorine demand What is the most important measurable parameter to judge the performance of an anaerobic sludge digester? - Volatile solids reduction What is a multicopy shipping document that accompanies hazardous waste shipments called? - Manifest The HAZWOPER Standard, 29 CFR 1910.120 addresses which of the following situations? - 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: - ignitability, corrosivity, reactivity, and toxicity. Performance standards do not place emphasis on which of the following? - Personality characteristics Of the following inquiries during an interview, which one is appropriate? - "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.