AALSO Water Quality Level 1 Exam Questions with
correct Answers
Define "absorption spectroscopy" - Answer-An analytical method that uses the
wavelength dependent absorption characteristics of materials to identify and quantify
specific substances
/.Define "accuracy" - Answer-The degree of agreement between the experimental result
and the true value
/.Define "administrative controls" - Answer-Changes in work procedures with the goal of
reducing the duration, frequency, and severity of exposure to hazardous chemicals or
situations
/.Define "alkalinity" (water quality definition) - Answer-A measure of water's resistance to
changes in pH or its buffering capacity
/.What does AOB stand for? - Answer-Ammonia oxidizing bacteria
/.Define "ammonia oxidizing bacteria" - Answer-Nitrifying bacteria that promote
oxidation of ammonia into nitrite
/.What does AOD stand for? - Answer-Applied ozone dose
/.Define "applied ozone dose" - Answer-The quantity of ozone applied for a given flow,
or the required ozone production rate
/.Define "DPD Method" - Answer-A method of measuring the chlorine residual in water
/.Define "engineering controls" - Answer-Methods that are built into the design of a
plant, equipment, or process to minimize the hazard
/.What does GHS stand for? - Answer-Globally Harmonized System
/.Define "Globally Harmonized System" - Answer-An international system of
classification and labelling of chemicals
/.Define "Laboratory Fortified Blank" - Answer-A solution of analyte-free water with
known amount of target analyte
/.Define "Laboratory fortified matrix" - Answer-An aliquot of sample with the addition of
known amount of target analyte prior to sample preparation and analysis
, /.Define "Laboratory fortified matrix duplicate" - Answer-A duplicate of the matrix spike
also used to assess the precision and bias of a method in a given sample matrix
/.Define "Matrix" (water quality definition) - Answer-The components of a sample other
than the analyte of interest
/.Define "Matrix duplicate" - Answer-A split sample used to assess the precision of a
method in a given sample matrix
/.What does MPN stand for? - Answer-Most Probable Number
/.What is MPN used for? - Answer-Quantifying an estimated concentration of bacteria
/.Define "New Tank Syndrome" - Answer-The toxic buildup of ammonia and nitrite in a
new system
/.What causes New Tank Syndrome? - Answer-The bacteria have not reached a
population level large enough to process the available ammonia or nitrite produced
/.What does ORP stand for? - Answer-oxidation-reduction potential
/.Define "Oxidation-reduction potential" - Answer-The electrical potential required to
transfer electrons from one compound or element (the oxidant) to another compound or
element (the reductant); in water quality, this result is the net status of all oxidation and
reduction reactions in the sample being measured.
/.What unit is used for oxidation-reduction potential (ORP)? - Answer-millivolts
/.Define "oxidant" - Answer-A reactant that oxidizes or removes electrons from other
reactants during a redox reaction
/.Define "oxidation" - Answer-A chemical reaction involving the gain of oxygen, or loss of
electrons
/.What does a positive ORP result indicate? - Answer-An oxidizing environment
/.What does a negative ORP result indicate? - Answer-A reducing environment
/.Define "ozone" (water quality definition) - Answer-An unstable gas that is toxic to
humans and has a strong odor; a strong oxidizing agent
/.What is the chemical composition of ozone? - Answer-O3
/.Define "pH" - Answer-An expression of the intensity of the basic or acidic condition of a
liquid
correct Answers
Define "absorption spectroscopy" - Answer-An analytical method that uses the
wavelength dependent absorption characteristics of materials to identify and quantify
specific substances
/.Define "accuracy" - Answer-The degree of agreement between the experimental result
and the true value
/.Define "administrative controls" - Answer-Changes in work procedures with the goal of
reducing the duration, frequency, and severity of exposure to hazardous chemicals or
situations
/.Define "alkalinity" (water quality definition) - Answer-A measure of water's resistance to
changes in pH or its buffering capacity
/.What does AOB stand for? - Answer-Ammonia oxidizing bacteria
/.Define "ammonia oxidizing bacteria" - Answer-Nitrifying bacteria that promote
oxidation of ammonia into nitrite
/.What does AOD stand for? - Answer-Applied ozone dose
/.Define "applied ozone dose" - Answer-The quantity of ozone applied for a given flow,
or the required ozone production rate
/.Define "DPD Method" - Answer-A method of measuring the chlorine residual in water
/.Define "engineering controls" - Answer-Methods that are built into the design of a
plant, equipment, or process to minimize the hazard
/.What does GHS stand for? - Answer-Globally Harmonized System
/.Define "Globally Harmonized System" - Answer-An international system of
classification and labelling of chemicals
/.Define "Laboratory Fortified Blank" - Answer-A solution of analyte-free water with
known amount of target analyte
/.Define "Laboratory fortified matrix" - Answer-An aliquot of sample with the addition of
known amount of target analyte prior to sample preparation and analysis
, /.Define "Laboratory fortified matrix duplicate" - Answer-A duplicate of the matrix spike
also used to assess the precision and bias of a method in a given sample matrix
/.Define "Matrix" (water quality definition) - Answer-The components of a sample other
than the analyte of interest
/.Define "Matrix duplicate" - Answer-A split sample used to assess the precision of a
method in a given sample matrix
/.What does MPN stand for? - Answer-Most Probable Number
/.What is MPN used for? - Answer-Quantifying an estimated concentration of bacteria
/.Define "New Tank Syndrome" - Answer-The toxic buildup of ammonia and nitrite in a
new system
/.What causes New Tank Syndrome? - Answer-The bacteria have not reached a
population level large enough to process the available ammonia or nitrite produced
/.What does ORP stand for? - Answer-oxidation-reduction potential
/.Define "Oxidation-reduction potential" - Answer-The electrical potential required to
transfer electrons from one compound or element (the oxidant) to another compound or
element (the reductant); in water quality, this result is the net status of all oxidation and
reduction reactions in the sample being measured.
/.What unit is used for oxidation-reduction potential (ORP)? - Answer-millivolts
/.Define "oxidant" - Answer-A reactant that oxidizes or removes electrons from other
reactants during a redox reaction
/.Define "oxidation" - Answer-A chemical reaction involving the gain of oxygen, or loss of
electrons
/.What does a positive ORP result indicate? - Answer-An oxidizing environment
/.What does a negative ORP result indicate? - Answer-A reducing environment
/.Define "ozone" (water quality definition) - Answer-An unstable gas that is toxic to
humans and has a strong odor; a strong oxidizing agent
/.What is the chemical composition of ozone? - Answer-O3
/.Define "pH" - Answer-An expression of the intensity of the basic or acidic condition of a
liquid
