AALSO WATER QUALITY LEVEL 1 EXAM
2025 QUESTIONS 100% ANSWERED.
Define "absorption spectroscopy" - ANSWERAn analytical method that uses the
wavelength dependent absorption characteristics of materials to identify and quantify
specific substances
Define "accuracy" - ANSWERThe degree of agreement between the experimental result
and the true value
Define "administrative controls" - ANSWERChanges 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) - ANSWERA measure of water's resistance
to changes in pH or its buffering capacity
What does AOB stand for? - ANSWERAmmonia oxidizing bacteria
Define "ammonia oxidizing bacteria" - ANSWERNitrifying bacteria that promote
oxidation of ammonia into nitrite
What does AOD stand for? - ANSWERApplied ozone dose
Define "applied ozone dose" - ANSWERThe quantity of ozone applied for a given flow,
or the required ozone production rate
Define "DPD Method" - ANSWERA method of measuring the chlorine residual in water
Define "engineering controls" - ANSWERMethods that are built into the design of a
plant, equipment, or process to minimize the hazard
What does GHS stand for? - ANSWERGlobally Harmonized System
Define "Globally Harmonized System" - ANSWERAn international system of
classification and labelling of chemicals
Define "Laboratory Fortified Blank" - ANSWERA solution of analyte-free water with
known amount of target analyte
Define "Laboratory fortified matrix" - ANSWERAn aliquot of sample with the addition of
known amount of target analyte prior to sample preparation and analysis
, Define "Laboratory fortified matrix duplicate" - ANSWERA 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) - ANSWERThe components of a sample other
than the analyte of interest
Define "Matrix duplicate" - ANSWERA split sample used to assess the precision of a
method in a given sample matrix
What does MPN stand for? - ANSWERMost Probable Number
What is MPN used for? - ANSWERQuantifying an estimated concentration of bacteria
Define "New Tank Syndrome" - ANSWERThe toxic buildup of ammonia and nitrite in a
new system
What causes New Tank Syndrome? - ANSWERThe bacteria have not reached a
population level large enough to process the available ammonia or nitrite produced
What does ORP stand for? - ANSWERoxidation-reduction potential
Define "Oxidation-reduction potential" - ANSWERThe 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)? - ANSWERmillivolts
Define "oxidant" - ANSWERA reactant that oxidizes or removes electrons from other
reactants during a redox reaction
Define "oxidation" - ANSWERA chemical reaction involving the gain of oxygen, or loss
of electrons
What does a positive ORP result indicate? - ANSWERAn oxidizing environment
What does a negative ORP result indicate? - ANSWERA reducing environment
Define "ozone" (water quality definition) - ANSWERAn unstable gas that is toxic to
humans and has a strong odor; a strong oxidizing agent
What is the chemical composition of ozone? - ANSWERO3
Define "pH" - ANSWERAn expression of the intensity of the basic or acidic condition of
a liquid
2025 QUESTIONS 100% ANSWERED.
Define "absorption spectroscopy" - ANSWERAn analytical method that uses the
wavelength dependent absorption characteristics of materials to identify and quantify
specific substances
Define "accuracy" - ANSWERThe degree of agreement between the experimental result
and the true value
Define "administrative controls" - ANSWERChanges 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) - ANSWERA measure of water's resistance
to changes in pH or its buffering capacity
What does AOB stand for? - ANSWERAmmonia oxidizing bacteria
Define "ammonia oxidizing bacteria" - ANSWERNitrifying bacteria that promote
oxidation of ammonia into nitrite
What does AOD stand for? - ANSWERApplied ozone dose
Define "applied ozone dose" - ANSWERThe quantity of ozone applied for a given flow,
or the required ozone production rate
Define "DPD Method" - ANSWERA method of measuring the chlorine residual in water
Define "engineering controls" - ANSWERMethods that are built into the design of a
plant, equipment, or process to minimize the hazard
What does GHS stand for? - ANSWERGlobally Harmonized System
Define "Globally Harmonized System" - ANSWERAn international system of
classification and labelling of chemicals
Define "Laboratory Fortified Blank" - ANSWERA solution of analyte-free water with
known amount of target analyte
Define "Laboratory fortified matrix" - ANSWERAn aliquot of sample with the addition of
known amount of target analyte prior to sample preparation and analysis
, Define "Laboratory fortified matrix duplicate" - ANSWERA 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) - ANSWERThe components of a sample other
than the analyte of interest
Define "Matrix duplicate" - ANSWERA split sample used to assess the precision of a
method in a given sample matrix
What does MPN stand for? - ANSWERMost Probable Number
What is MPN used for? - ANSWERQuantifying an estimated concentration of bacteria
Define "New Tank Syndrome" - ANSWERThe toxic buildup of ammonia and nitrite in a
new system
What causes New Tank Syndrome? - ANSWERThe bacteria have not reached a
population level large enough to process the available ammonia or nitrite produced
What does ORP stand for? - ANSWERoxidation-reduction potential
Define "Oxidation-reduction potential" - ANSWERThe 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)? - ANSWERmillivolts
Define "oxidant" - ANSWERA reactant that oxidizes or removes electrons from other
reactants during a redox reaction
Define "oxidation" - ANSWERA chemical reaction involving the gain of oxygen, or loss
of electrons
What does a positive ORP result indicate? - ANSWERAn oxidizing environment
What does a negative ORP result indicate? - ANSWERA reducing environment
Define "ozone" (water quality definition) - ANSWERAn unstable gas that is toxic to
humans and has a strong odor; a strong oxidizing agent
What is the chemical composition of ozone? - ANSWERO3
Define "pH" - ANSWERAn expression of the intensity of the basic or acidic condition of
a liquid
