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TEST

1.	Examples of Preliminary treatment in a wastewater plant are:
	a.		dissolved and colloidal organic matter.
	b.		disinfection
	c.		bar racks and screens
	d.		WAS and RAS

2.	EPA Form 3320 must be completed each month and submitted to the Georgia EPD by:
	a.		the first of every month
	b.		the 15th of the next month
	c.		the end of every month
	d.		the end of the year

3.	A pipet which is graduated from a zero mark near the top of the pipet to the tip of the pipet and must be blown out with a pipet bulb is an example of a/an:
	a.		Volumetric pipet
	b.		Motor pipet
	c.		Automatic pipet
	d.		Serological pipet

4	A sample that is collected at a particular instant of time and reflects the source material conditions is a/an:
	a.		Grab sample
	b.		Automated sample
	c.		Composite sample
	d.		Flow proportional composite

5	If a sample had an initial DO of 8.9 mg/L and a final DO of 6.4 mg/L with the addition of 3 mL of sample, what would the BOD of the sample be?
	a.		100 mg/L
	b.		150 mg/L
	c.		200 mg/L
	d.		250 mg/L

6	How long must lab records be retained (excluding sludge disposal records)?
	a.		1 year
	b.		3 years
	c.		5 years
	d.		7 years

7	What is the molecular weight of sodium thiosulfate pentahydrate (Na2S2O3 · 5H2O)
	a.		422.18
	b.		378.39
	c.		211.90
	d.		248.18

8	The total program that a laboratory uses to establish and maintain high standards of performance is:
	a.		Quality Assurance
	b.		Matrix Spikes
	c.		Quality Control
	d.		Duplicates

9	EPD refers to Total Suspended Solids (TSS) as:
	a.		Volatile Solids
	b.		Non filterable residue
	c.		Ash
	d.		Filterable residue

10	In the Membrane Filter technique for Fecal Coliform, the incubation temperature is:
	a.		550º C
	b.		180º C
	c.		44.5º C
	d.		20º C

11	A phosphorous sample is analyzed. No phosphorous is detected. The sample is matrix spiked with a 1.5% mg/L phosphorous standard. The sample is analyzed again and the result is 1.37 mg/L Determine the accuracy of the results.:
	a.		1 %
	b.		99 %
	c.		85 %
	d.		91 %

12	The most common method of preservation is:
	a.		cooling to 4º C
	b.		acidification
	c.		eutrophication
	d.		desiccation

13	The number of moles per liter of solution is:
	a.		Normality
	b.		Concentration
	c.		Molarity
	d.		Formula Mass

14	How many mLs of a 0.040M H2SO4 solution must be diluted to 500 mLs to make a 0.010M H2SO4 solution:
	a.		250 mLs
	b.		150 mLs
	c.		75 mLs
	d.		125 mLs

15	When mixing acids with water, you should:
	a.		never do it
	b.		always pour acid into water
	c.		always add base first
	d.		always pour water into acid

16	A (n)__________ is a legal document that contains all the sampling information and who possessed the sample and when:
	a.		EPA Form 3320
	b.		Discharge Monitoring Report
	c.		Chain of Custody
	d.		Analytical Protocol

17	Duplicate chlorine samples are analyzed. One reads 1.04 mg/L, the other reads 1.10 mg/L. Determine the precision of the analysis.
	a.		6 %
	b.		3 %
	c.		4 %
	d.		89 %

18	The explosion in the growth rate of algae is called:
	a.		air stripping
	b.		decomposition
	c.		photosynthesis
	d.		a bloom

19	The concentration of hydrogen ions is:
	a.		Alkalinity
	b.		Acidity
	c.		Normality
	d.		Molality

20	__________ is a method used to determine DO.
	a.		Sodium Thiosulfate
	b.		Winkler titration
	c.		Cadmium Reduction
	d.		Ascorbic Acid

21	During TSS analysis the oven temperature should be:
	a.		104º C
	b.		550º C
	c.		44.5º C
	d.		180º C

22	The endpoint pH for the Alkalinity test is:
	a.		7.0 SU
	b.		5.5 SU
	c.		9.0 SU
	d.		4.5 SU

23	Analysis performed as a result of a monitoring requirement imposed by a municipality, state or federal government in support of a NPDES permit is known as:
	a.		Code of Federal Regulations
	b.		Process Control
	c.		Regulatory Reporting
	d.		Federal Register

24	In addition to Nitrogen, what is a nutrient that can cause eutrophication?
	a.		Phosphorous
	b.		Chlorine
	c.		BOD
	d.		Alkalinity

25	A 25 ml sample is filtered for TSS. The tare weight of the filter is 0.1108 g and the final weight of the filter is 0.1155 g. What is the TSS of the sample?
	a.		215 mg/L
	b.		188 mg/L
	c.		124 mg/L
	d.		95 mg/L

26	The federal wastewater rules and regulations are located in the _____.
	a.		QA/AC manuals
	b.		Code of Federal Regulations
	c.		Sacramento manuals
	d.		Compliance permit

27	What must be added to a sample taken for Coliform testing?
	a.		Sodium Thiosulfate
	b.		Sodium Hydroxide
	c.		Alum
	d.		Sulfuric acid

28	Laboratory results which aid in making plant changes are called:
	a.		compliance monitoring
	b.		acceptable
	c.		regulatory reporting
	d.		process control

29	If 10 mL of a 50 mg/L Phosphate stock solution is diluted with 250 mL of sample, what would the Matrix Spike of the sample be?
	a.		5 mg/L
	b.		3 mg/L
	c.		2 mg/L
	d.		1 mg/L

30	The neutral pH value is:
	a.		0 SU
	b.		14 SU
	c.		7.0 SU
	d.		1.0 SU

31	Ion - free water which is taken through the entire analytical process is a:
	a.		reagent blank
	b.		standard
	c.		titrant
	d.		matrix spike

32	_____ is an example of a compound.
	a.		Hydrogen
	b.		Calcium
	c.		Oxygen
	d.		Sodium Chloride

33	If a procedure calls for 6.55 g of Potassium Chloride (KCl) to be used to make a solution but the only chemical on hand is Potassium Chloride Pentahydrate (KCl · 5H2O), calculate the amount of the hydrate chemical to be used in place of the anhydrous chemical called for.
	a.		2.96 g
	b.		14.46 g
	c.		7.65 g
	d.		12.25 g

34	The temperature at which volumetric glassware is calibrated is marked on the glassware. If it is not marked, what is considered the standard temperature?
	a.		20º C
	b.		35º C
	c.		104º C
	d.		180º C

35	_____ samples are samples of known concentration which are analyzed by the laboratory as unknown samples.
	a.		Grab
	b.		Time Composite
	c.		Performance Evaluation
	d.		Flow Composite

36	A chain of custody record is important because:
	a.		it is important in the calibration method.
	b.		it tells when a sample should be analyzed.
	c.		EPD requires one for plant compliance.
	d.		it is a legal document detailing physical trail.

37	_____ are examples of volumetric glassware.
	a.		Erlenmeyer flasks
	b.		graduated cylinders
	c.		test tubes
	d.		beakers

38	Tolerances for Class B glassware are normally higher than that of Class A. How much higher are they?:
	a.		ten times
	b.		two times
	c.		three times
	d.		four times

39	Graphical representations of the results obtained from a quality control measure performed on a regular basis are:
	a.		% R
	b.		RPD
	c.		Control charts
	d.		Logarithmic graphs

40	The indicator organism for pathogenic bacteria contamination in wastewater is:
	a.		Fecal coliform
	b.		Typhoid
	c.		Legionella
	d.		Giardia

41	Wastewater is conveyed to the POTW through the :
	a.		Parshall flume
	b.		sanitary sewer system
	c.		Storm water drains
	d.		Secondary treatment facility

42	Federally approved methods for wastewater analysis are listed in 40 CFR Part ___
	a.		120
	b.		150
	c.		141
	d.		136

43	If a sample is analyzed for Ammonia and has a reading of 0.88 mg/L, calculate the accuracy for the sample if the final reading is 2.66 mg/L from a 2.00 mg/L matrix spike.
	a.		77 %
	b.		85 %
	c.		89 %
	d.		67 %

44	If 25 mL of sample is filtered for fecal coliform and after incubation there are 12 colonies present on the membrane filter, what is the colony count per 100 mL?
	a.		12
	b.		25
	c.		36
	d.		48

45	_____ is an example of an element:
	a.		Salt
	b.		Air
	c.		diamond
	d.		alum

46	Which type of pipet is recognized by a bubble in the center and will only transfer one amount?
	a.		Mohr
	b.		Volumetric
	c.		Serological
	d.		Disposable

47	In the BOD test there must be at least a _____ drop from the initial DO to the final DO
	a.		1 mg/L
	b.		1.5 mg/L
	c.		2 mg/L
	d.		2.5 mg/L

48	The most reliable method for the detection of DO is the:
	a.		Winkler titration
	b.		Colorimetric
	c.		Potentiometric
	d.		Color Wheel

49	214 mg is equal to how many grams?
	a.		21.4 g
	b.		2.14 g
	c.		0.214 g
	d.		0.0214 g

50	Most analytical balances are sensitive to the:
	a.		0.1 g
	b.		0.01 g
	c.		0.001 g
	d.		0.0001 g

51	"NPDES" stands for
	a.		National Pollutant Discharge Elimination System
	b.		National Pollutant Discharge Eliminating System
	c.		National Pollution Discharge Elimination System
	d.		National Pollution Discharge Eliminating System

	a.
	b.
	c.
	d.

52. Calculate the molecular mass of sodium molybdate dihydrate, Na₂MoO₄ · 2H₂O.

A. 141.9

B. 241.9

C. 100.0

D. 223.9

53. Concentrated hydrochloric acid is 37% by weight in water. Calculate how you will prepare 1000 mL of a 1.00 M solution of hydrochloric acid.

A.

B.

C.

D. 98.5

54. You have a 0.75 M solution of potassium dichromate. Calculate how you would prepare 100 mL of 0.025 M concentration potassium dichromate solution.

A. Dilute 33.3 mL of more concentrated solution to 100 mL.

B. Dilute 33.3 mL of more concentrated solution to 1000 mL.

C. Dilute 3.33 mL of more concentrated solution to 100 mL.

D. Dilute 3.33 mL of more concentrated solution to 1000 mL.

55. Calculate and describe how you would prepare one liter of 0.33 M nitric acid from commercially available concentrated HNO₃ which is 70% by weight. A. Weigh out 2.97 g of concentrated acid, then dilute to 1000 mL.

B. Weigh out 2.97 g of concentrated acid, then dilute to 100 mL.

C. Weigh out 29.7 g of concentrated acid, then dilute to 100 mL.

D. Weigh out 29.7 g of concentrated acid, then dilute to 1000 mL.

56. 356.41 mg of KHP (KC₈H₅O₄, Mwt 204.23) was used to standardize a sodium hydroxide solution. The titration required 22.63 mL of the base solution. The standardized base was used in turn to standardize a sulfuric acid solution. It required 17.39 mL of the acid to neutralize 10.00 mL of the base. Calculate the normality of the acid solution. A.

B.

C.

D.

57. Water density at 20º C is 0.998203 g/mL. A 55 gallon drum is filled with a water solution that has a density of 1.1201 g/mL. How much solid is dissolved in the water in terms of mg/L? A. 6.7045

B. .121897

C. 121.897

D. 121897

58. The conversion from mg/L to gal/MG is direct, MG = Million gallons. There are 8.34 lb. per gallon of water. Thus a conversion from mg/L to lb/MG is: lb/MG = 8.34 x mg/L. If a sample analyzes as 0.89 mg/L chlorine, what is the concentration of chlorine in lb/MG? A. 7.4226

B. 74.226

C. 9.3707

D. 9.2301

59. In problem 57, what is the concentration of solid in the water in terms of mg/L, lb/MG and lb. in the drum?

A. 121897, 1016620, 55.9

B. 121897, 7.4226, 55.9

C. 121897, 55.9, 1016620

D. 121.897, 101.662, 559.0

60. In problem 57, if 35 lb. of additional solid are dissolved in the drum and there is no change in the volume, what is the final density?

A.

B.

C.

D.

61. If the contents of the drum in Problem 57 are diluted to 100,000 gallons, what is the final concentration in terms of lb/MG and in terms of mg/L?

A.

B.

C.

D.

62. 5.31 mL of 0.12 M K₂Cr₂O₇ contains how many mg of potassium dichromate?

A. 1562

B. 187

C. 35.30

D. 39.0983

63. 4.10 g of K₂Cr₂O₇ is add to 750 mL of 0.141 M K₂Cr₂O₇. What is the final concentration?

A.

B.

C.

D.

64. 10.71 mL of 0.0200 N H₂SO₄ contains how many mg of H₂SO₄? A.

B.

C.

D.

65. 37.5 mL of 0.050 M H₂SO₄ is add to 42.7 mL of 0.092 M NaOH. Is the final solution acidic or basic? What is the concentration of the excess acid or base? What is the molar concentration of the salt formed? A.

B.

C.

D.

66. It takes 10.34 mL of 0.0153 M sodium thiosulfate to titrate 400 mL of a chlorine solution treated with iodide and starch to the colorless endpoint. What is the chlorine concentration in mg/L? A.

B.

C.

D.

67. Beginning with a 5.5% bleach solution (NaOCl), describe how to make 100 mL of a 1.0 mg/L chlorine standard. A.

B.

C.

D.

68. 25.0 mL of a 0.0120 M solution is evaporated to give 37.5 mg of solid. What is the molecular mass of the solid? A.

B.

C.

D.

69. 1000 mL of sample is distilled to give 250 mL of distillate. 50.0 mL of the distillate was analyzed and found to be above the calibration curve. A 1:10 dilution of the distillate gave a value of 27.1 lg. What is the concentration of the original sample in mg/L? A.

B.

C.

D.

70. 97 L of air was passed through a charcoal tube. The contents of the tube were analyzed and found to contain 10.3 lg of benzene. What is the concentration of benzene in air in mg/m³?

A.

B.

C.

D.

71. 30.0 g of solid was extracted and the extract concentrated to 1.00 mL. A 1.0 lL injection of the extract was found to contain 29.1 gg MEBS. What is the wet weight concentration of MEBS in the solid in mg/kg?

A.

B.

C.

D.

72. A sample of the solid in problem 71 was taken for % moisture determination. The tare was 1.0417 g, the total was 2.1256 g and the total after drying was 2.0051. What is the % moisture? A.

B.

C.

D.

73. Using the results in 71 and 72, what is the dry weight result for MEBS?

A.

B.

C.

D.

74. Water has a density of 0.998203 and methanol has a density of 0.791 at 20º C. Assuming there is only simple mixing of the two solutions what is the density of a 1 + 3 solution (methanol + water). A.

B.

C.

D.

75. Sludge volume index (SVI) has units of mL/g. The 30 minute settling volume for a sample was 19% and the TSS was 2400 mg/L. Calculate the SVI. A.

B.

C.

D.

76. COD has the following reaction for KHP (KC₈H₅O₄, Mwt 204.23) as a standard: 2 KC₈H₅O₄ + 10 K₂Cr₂O₇ + 41 H₂SO₄ d 16CO₂ + 46H₂O + 10Cr₂(SO₄)₃ + 11K₂SO_4. A 300 mg/L solution of KHP (the first compound) exhibits what mg/L of oxygen (O₂) if 1.00 moles of dichromate is equivalent to 1.5 moles of oxygen (O₂)? A.

B.

C.

D.

77. What is the percent of hydrogen by weight in hexadecane (C₁₆H₃₄)? A.

B.

C.

D.

78. If hexadecane has a density of 0.773 at 20 ºC, what is the weight/volume percent of hydrogen? A.

B.

C.

D.

79. A 100.0 mL volume blank is digested and diluted to a final volume of 100.0 then analyzed to give 0.080 mg/L of chromium. A 1.00 g sample of solid is digested and diluted to a final volume of 100.0 mL and when tested exhibits 6.00 mg/kg chromium. Is the chromium in the sample because of laboratory contamination or does the sample have chromium in it?

A. Sample

B. Laboratory contamination

C. Analyst error

D. Bad sampling

80. Which fertilizer is the most efficient source of nitrogen on a pound for pound comparison: Ammonia (NH